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REVIEW 3 major objections 5 minor 90 references

Synthetic accessibility and sodium ion conductivity of the Na$_{8-x}$A$^{x}$P$_2$O$_9$ (NAP) high-temperature sodium superionic conductor framework

T0 review · 3 major / 5 minor · reviewed 2026-08-10 · deepseek-v4-flash

Pith's one-line read The NAP sodium phosphate framework is a tunable solid-electrolyte family whose high-temperature conduction is gated by a phonon-driven structural transition, and whose substituted members screen as fast sodium conductors.

desk verdict Honest and useful survey of a neglected sodium-ion framework with a new phase and a plausible phonon mechanism, but the MLMD conductivity predictions over-promise relative to the paper's own EIS data. read the letter →

arxiv 2501.03165 v1 pith:42VB5KIG submitted 2025-01-06 cond-mat.mtrl-sci

classification cond-mat.mtrl-sci
keywords sodiumsolid-stateelectrolyteNAPframeworkphonon-drivenconductivitytransitioncationsubstitutionscreeningmachine-learnedpotentialmoleculardynamicsNa4SnP2O9synthesis
verification ladder T0 review T1 audit T2 compute T3 formal

The pith

A machine-rendered reading of the paper's core claim, the machinery that carries it, and where it could break.

The reading

This paper argues that the NAP family of sodium phosphates, formula $\mathrm{Na}_{8-x}A^{x}\mathrm{P}_2\mathrm{O}_9$, is a tunable platform for solid-state sodium electrolytes that has been overlooked because its known members stop conducting when cooled. The parent phase Na4TiP2O9 is shown to be dynamically unstable in its high-temperature form, with phonon modes that distort titanium octahedra and sodium cages and raise the energy barrier for sodium motion below roughly 300 °C. Using convex-hull stability, reaction-energy filters, and machine-learned-potential molecular dynamics, the authors identify fifteen cation-substituted NAP phases that are thermodynamically plausible, several of which are predicted to be fast sodium conductors; the 5+ candidates Na3VP2O9 and Na3TaP2O9 are extrapolated to room-temperature conductivities of about 11–12 mS/cm. One new member, Na4SnP2O9, was synthesized near phase purity, but it conducts only at high temperature, and its measured activation energy (0.916 eV) is far above the predicted 0.27 eV—the gap exposing the machine-learned-potential diffusivity step as the fragile link. The wider point is that NAP deserves a place in sodium solid-state electrolyte design despite, or because of, its temperature-driven conductivity transition.

What carries the argument

The central object is the NAP framework itself: an orthorhombic (Bmem) sodium phosphate built from one-dimensional chains of corner-sharing AO6 octahedra, phosphate tetrahedra, and two kinds of sodium polyhedra (square-pyramidal and 8-coordinate cubic cages) that share faces and form percolation channels in the a-c plane. The argument is carried by two mechanisms. First, phonon calculations on the parent Na4TiP2O9 show unstable modes—pseudo-Jahn-Teller elongation/compression of TiO6 octahedra, octahedral rotation coupled to Na-Na dimerization, and collective oxygen wobbling—which together transform the fast-conducting orthorhombic phase into the distorted monoclinic phase with a much steeper sodium site-energy landscape. Second, a screening funnel combines convex-hull energy, precursor reaction energy, and machine-learned-potential molecular dynamics diffusivities to rank $\mathrm{Na}_{8-x}A^{x}\mathrm{P}_2\mathrm{O}_9$ candidates, with sodium vacancies (created by 4+ and 5+ substitution) as the mobile-carrier variable and a radius-dependent activation energy attributed to a pillaring effect.

What would settle it

Measure EIS on a phase-pure Na4SnP2O9 pellet with a fully solved low-temperature structure across 25–400 °C and compare with MLMD trajectories on that same structure; if the measured activation energy remains near 0.9 eV rather than the predicted 0.27 eV and no high-conductivity transition appears in the simulation, the MLMD-based room-temperature conductivities for the unsynthesized NAP candidates are unsupported.

Watch

Extended reading notes

Core claim

The paper's central claim is that the NAP framework—$\mathrm{Na}_{8-x}A^{x}\mathrm{P}_2\mathrm{O}_9$, built from one-dimensional AO6 octahedral chains and large sodium cages—is a chemically flexible sodium superionic platform whose poor reputation comes from a removable structural problem. The high-temperature orthorhombic parent Na4TiP2O9 is dynamically unstable: phonon calculations find pseudo-Jahn-Teller TiO6 elongation/compression modes, octahedral rotations, and oxygen wobbling that, on cooling, distort the sodium polyhedra and steepen the energy landscape for alternative sodium occupations, producing the measured order-of-magnitude conductivity drop near 300 °C. Substituting 3+, 4+, and 5+ cations changes sodium content and vacancy patterns; fifteen of twenty-five candidate phases are computed to lie within 30 meV/atom of their convex hull, and almost all have negative reaction energies from common sodium carbonate, ammonium phosphate, and oxide precursors. Molecular-dynamics conductivity screening then singles out 5+ substitutions (Na3VP2O9 and Na3TaP2O9) as room-temperature conductors near 10 mS/cm, with 4+ substitution showing a radius-dependent activation-energy trend attributed to a pillaring effect. Experimentally, one new phase, Na4SnP2O9, was synthesized and optimized to near phase purity, but its measured ambient conductivity is about $10^{-7}$ S/cm with a 0.916 eV activation energy—far higher than the predicted 0.27 eV—which the authors attribute to an incomplete structural model, grain-boundary resistance, or the tin-rich particle surface rather than to failure of the framework concept.

Load-bearing premise

The screening's promise rests on fine-tuned machine-learned-potential molecular dynamics giving quantitatively reliable sodium diffusion barriers, yet the measured activation energies for both synthesized NAP phases are about three times the predicted ones.

Editorial extensions

If this is right

  • The NAP framework is compositionally flexible: fifteen of the twenty-five tested A-site substitutions sit within 30 meV/atom of the convex hull, so the sodium phosphate family is not restricted to the titanium parent.
  • Five-plus cation substitutions with lower sodium content, particularly Na3VP2O9 and Na3TaP2O9, are predicted to be fast room-temperature conductors on the order of 10 mS/cm with three-dimensional diffusion at high temperature, making them the most promising targets for further synthesis.
  • The conductivity transition in NTP is caused by unstable phonon modes that distort the sodium site energy landscape, so suppressing those modes is the route to room-temperature conduction in NAP materials.
  • A new NAP phase, Na4SnP2O9, is synthesizable by conventional solid-state routes, but only the poorly conducting low-temperature form was obtained; ball milling with nanoparticle SnO2 and a roughly 950 °C dwell gives near phase purity.
  • Thermodynamic reaction energy alone is a poor predictor of solid-state synthesis success: calcination temperature and precursor mixing change target yield by tens of percent through the reaction pathway, so synthesis planning must include intermediate phases.

Reading between the lines

Editorial extensions of the paper, not claims the author makes directly.

  • If the phonon-driven transition is the gate, then partial substitution or sodium-vacancy engineering that suppresses the soft modes could stabilize the fast orthorhombic phase at room temperature; the paper lists stabilization of high-symmetry polymorphs as future work but does not demonstrate it.
  • The systematic MLMD/EIS gap, with predicted barriers roughly one-third of measured values, suggests either that the literature structures used for simulation are not the real transport geometries or that interface and grain-boundary resistance dominate the pellets; a single-particle or single-crystal conductivity measurement would separate the two and is a direct next test.
  • The calcination effect implies that the molecular unit of the phosphate precursor—isolated PO4 versus condensed polyphosphate—is a synthesis variable for the whole phosphate family, so precursor ranking algorithms should incorporate pathway intermediates rather than only final reaction energies.
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Editorial analysis

A structured set of objections, weighed in public.

Desk editor's note, referee report, and a circularity audit.

Referee Report

3 major / 5 minor

Summary. This manuscript reports a combined computational and experimental survey of the Na8−xAxP2O9 (NAP) family of sodium ion conductors. The authors analyze the parent Na4TiP2O9, attribute its low-temperature distortion to unstable phonons, perform high-throughput DFT and machine-learned potential screening of 24 A-site substitutions, and attempt synthesis of the promising candidates in an automated laboratory. They report successful synthesis of one new member, Na4SnP2O9, along with structural, microscopic, and impedance characterization, and propose a conduction pathway model for the NAP framework.

Significance. If the screening results were reliable, the NAP framework would be a valuable new tunable platform for sodium solid electrolytes, and the phonon-based explanation of the conductivity transition would be a useful design rule. The experimental work also provides a rare detailed account of the difficulties of solid-state synthesis of sodium phosphates, including a quantitative comparison of mixing methods, which is a useful contribution to synthesis science. The paper is exemplary in documenting its own limitations: the authors explicitly state that the NSP structure solution is not definitive, that the MLMD barriers disagree with EIS, and that more characterization is needed. The machine-checkable aspects, however, are limited: the DFT hull and phonon calculations are standard and reproducible, but the MLMD conductivity predictions are not validated against experiment.

major comments (3)
  1. [II.B.2, III.A, III.E (Figs. 3, 8)] The MLMD pipeline used for all predicted room-temperature conductivities is quantitatively inconsistent with the EIS measurements reported in the same paper. For NTP, the computed activation energies are 0.294 eV (LT) and 0.280 eV (HT) versus measured 0.836 eV and 0.449 eV, and the computation shows no conductivity transition (Fig. 3). For NSP, the computed 0.27 eV barrier contrasts with measured 0.916 eV and 0.867 eV in the two low-temperature regimes (Fig. 8). Since the same pipeline yields the 0.01–12.4 mS/cm predictions for unsynthesized candidates in Fig. 4b, the central claim of 'high predicted ionic conductivities' in the abstract is not supported by the evidence presented. The authors acknowledge the discrepancy but do not provide a resolution within the manuscript; this needs to be addressed by either validating the MLMD approach on related measured frameworks or substantially tempering the forward-looking claims.
  2. [III.E, Fig. 7a] The structural assignment of the new phase Na4SnP2O9 is explicitly acknowledged as 'not definitive.' The best refinement uses the orthorhombic Bmem prototype but has Rwp = 13.22% with unmatched peaks near 15°, 31.5°, and beyond 50° 2θ, and intensity mismatches on major peaks. Since the paper's central experimental claim is the discovery of this new NAP phase, and subsequent conductivity measurements and computational comparisons depend on this structure, a more rigorous structure solution (e.g., quantitative comparison of alternative ordered/distorted models, or additional diffraction data) is required before the synthesis claim can be taken as established.
  3. [III.B, III.C] The abstract and Section III.B describe the screened candidates as 'likely synthesizable' based on Ehull < 30 meV/atom and negative computed reaction energies. However, the automated synthesis trials in Section III.C succeeded for only one of the approximately ten candidates satisfying these criteria (Table S21); most reactions yielded only precursor phases or competing oxides. The authors offer plausible kinetic explanations, but the phrase 'likely synthesizable' is contradicted by the paper's own experimental outcomes. The screening claim should be reframed as 'thermodynamically promising but kinetically challenging' or supported by a quantitative metric that accounts for the observed failures.
minor comments (5)
  1. [Abstract] Typo: 'pseduo-Jahn Teller' should be 'pseudo-Jahn Teller'.
  2. [III.F] References to 'Figure 8a', 'Figure 8b', and 'Figure 8c' should refer to Figure 9 (the pathway schematic); Figure 8 is the NSP conductivity plot.
  3. [SI references] In the Supporting Information, reference [25] (Dara) and reference [28] (AutoSEMEDS) are listed as 'tbd tbd' and should be completed before publication.
  4. [II.B.3] The phrase 'Reaction network [50,51] was performed with the NSP phase set as the target' is missing an article; also there is inconsistent use of 'Reaction Network' versus 'reaction network'.
  5. [Throughout] There are several spelling errors: 'Brillion' zone (Section III.A), 'Suppplemental' (Section III.D.4), and 'Reitveld' (SI Section 7.1).

Circularity Check

0 steps flagged · score 0.0 of 10

No significant circularity: MLMD conductivity predictions are model outputs fitted to DFT data, not to the measured conductivities, and self-citations are tool citations rather than load-bearing reductions.

full rationale

None of the paper's central derivation steps reduce to their own inputs. The conductivity 'predictions' for substituted NAP phases (Fig. 4b) are outputs of fine-tuned CHGNet MLMD simulations; the potential is fitted to DFT energies and forces from on-the-fly FLARE MD (Section II.B.2), not to the experimental conductivities or Arrhenius barriers being reported. The EIS activation energies in Figs. 3 and 8 are independent measurements and are explicitly compared with, not used to construct, the computational values. The DFT phonon instability analysis (Fig. 2) and convex-hull/reaction-energy filters are independent first-principles calculations with fixed, stated settings (VASP/PBE, Phonopy, Materials Project hull). Self-citations occur (CHGNet [46], Dara [25], AlabOS [24], AutoSEMEDS [28]), but they cite tools that are applied operationally; none of the cited works is invoked as a theorem that forces a conclusion, and the synthesis/product identification is supported by manual Rietveld refinement, non-ambient XRD, and EDS. The paper explicitly flags the MLMD/experiment discrepancy and lists possible structural and microstructural causes, which is the opposite of presenting a fitted quantity as a prediction. Any concern about MLMD barrier accuracy is a correctness or validation risk, not a circularity.

Assumptions & free parameters 3 free parameters · 5 assumptions · 1 invented entities

The paper's central claims rest on four categories of assumptions: DFT ground states approximate the relevant thermodynamics, fine-tuned CHGNet remains predictive for sodium diffusion, hand-chosen sodium orderings represent the mobile-ion landscape, and the 30 meV/atom hull threshold plus solid-state screening tests synthesizability. The largest unvalidated load is the MLMD potential, whose predictions conflict with the two measured NAP phases.

free parameters (3)
  • Arrhenius activation energy and pre-exponential per NAP phase from MLMD = NTP LT 0.294 eV, NTP HT 0.280 eV, NSP 0.27 eV; other phases not all listed
    Room-temperature conductivities in Figure 4b are extrapolated from linear fits to MLMD diffusivities at eight temperatures; these fitted parameters set all predicted conductivities.
  • Fine-tuned CHGNet potential weights per structure = MAE energy 1-3 meV/atom, force 42-75 meV/A, stress 0.053-0.127 GPa
    CHGNet was fine-tuned on FLARE DFT data for each NAP phase before MD; all diffusivity results depend on these fitted weights.
  • Sodium-vacancy ordering for substituted A-site cations = 4+ cations: Na4 vacant; 5+ cations: Na4 and half of Na3 vacant; 3+ cations: all Na sites filled
    The initial sodium arrangements are chosen by hand from NTP ground-state or common occupancies; the predicted barriers and conductivities depend on this choice.
assumptions (5)
  • domain assumption DFT-PBE total energies approximate 0 K enthalpies and define the convex hull
    Used throughout Section III.B for stability and reaction energies; no vibrational or temperature corrections to the hulls are included.
  • domain assumption Nernst-Einstein relation converts self-diffusivities to ionic conductivities with correlation factor 1
    Invoked in Section II.B.2 to obtain all conductivity values from mean squared displacements; correlation effects and mobile carrier concentrations are not independently validated.
  • domain assumption Fine-tuned CHGNet potentials trained on short FLARE DFT trajectories remain accurate over 2 ns MD at 300 to 1000 K
    Diffusivity calculations in Section II.B.2 rely on this transfer; experimental EIS for NTP and NSP shows the predicted barriers are too low.
  • domain assumption Ehull below 30 meV/atom indicates likely synthesizability
    Used in Section III.B to filter candidates, following refs [56,57]; the paper's own syntheses show many such phases could not be made by solid-state routes.
  • domain assumption Quasiharmonic phonons at 0 K identify the instability responsible for the 250 to 300 C transition
    Phonon calculations in Section III.A are at 0 K within the quasiharmonic approximation, but the transition is temperature dependent; no anharmonic or finite-temperature phonon treatment is provided.
invented entities (1)
  • Na4SnP2O9 (NSP) in orthorhombic Bmem structure independent evidence
    purpose: New A-site substituted NAP phase intended as a sodium-ion conductor
    XRD refinement (Rwp=13.22%) and STEM-EDS bulk composition are consistent with the phase, but the structure model is acknowledged to be incomplete.

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Cite this review

Pith. "Pith review of Synthetic accessibility and sodium ion conductivity of the Na$_{8-x}$A$^{x}$P$_2$O$_9$ (NAP) high-temperature sodium superionic conductor framework." pith.science (2026). https://pith.science/paper/42VB5KIG

@misc{pith2026250103165,
  author       = {Pith},
  title        = {Pith review of: Synthetic accessibility and sodium ion conductivity of the Na$_8-x$A$^x$P$_2$O$_9$ (NAP) high-temperature sodium superionic conductor framework},
  year         = {2026},
  howpublished = {\url{https://pith.science/paper/42VB5KIG}},
  note         = {Machine review of arXiv:2501.03165}
}
abstract

Advancement of solid state electrolytes (SSEs) for all solid state batteries typically focuses on modification of a parent structural framework for improved conductivity, \textit{e.g.} cation substitution for an immobile ion or varying the concentration of the mobile ion. Therefore, novel frameworks can be disruptive by enabling fast ion conduction aided by different structure and diffusion mechanisms, and unlocking optimal conductors with different properties (\textit{e.g.} mechanical properties, sintering needs, electrochemical stability) than previously published. Herein, we perform a high throughput survey of an understudied structural framework for sodium ion conduction, Na$_{8-x}$A$^x$P$_2$O$_9$ (NAP), to understand the family's thermodynamic stability, synthesizability, and ionic conduction. We first show that the parent phase Na$_4$TiP$_2$O$_9$ (NTP) undergoes a structural distortion (with accompanying conductivity transition) due to unstable phonons from a pseduo-Jahn Teller mode in the 1D titanium chains. Then, screening of cation-substituted structural candidates with \textit{ab initio} and machine-learned potential calculations reveal a number of candidates that are thermodynamically stable, likely synthesizable, and have high predicted ionic conductivities. High throughput experimental trials and subsequent methodology optimization of one Na$_4$SnP$_2$O$_9$ (NSP) highlight collective challenges to the synthesis pathways for sodium phosphate materials via solid state synthesis. Our results demonstrate that NAP is a highly tunable conduction framework whose high temperature conductivity transition has heretofore eliminated it from significant research interest. By expanding the structural toolkit for SSE design, we increase the number of useful sodium ion electrolytes for integration into safe and accessible solid state batteries.

Figures

Figures reproduced from arXiv: 2501.03165 by the authors.

Figure 1
Figure 1. HT-NTP is a layered structure composed of five 1D chains of polyhedra stacked into two distinct layers in the a-c plane. Na+ ions are primarily located in large 8 coordination number (cn) distorted cubic polyhedra cages (Figure 1b). One-dimensional, corner-connected TiO6 octahedra chains (Figure 1b), surrounded by chains of phosphate tetrahedra that alternate with sodium square pyramidal 5-cn polyhedra, scaffold the… view at source ↗
Figure 2
Figure 2. FIG. 2. Figure showing (left) HT-NTP lattice dynamics calculations show negative modes at [PITH_FULL_IMAGE:figures/full_fig_p011_2.png] view at source ↗
Figure 3
Figure 3. FIG. 3. Computationally predicted and experimentally measured (golden line) temperature [PITH_FULL_IMAGE:figures/full_fig_p014_3.png] view at source ↗
Figures from the paper (6 more)
Figure 4
Figure 4. Figure 4: FIG. 4. Results from high throughput computational screening for candidate structures created [PITH_FULL_IMAGE:figures/full_fig_p017_4.png]
Figure 5
Figure 5. Figure 5: FIG. 5. Figure showing experimental synthesis conditions that impact [PITH_FULL_IMAGE:figures/full_fig_p019_5.png]
Figure 6
Figure 6. Figure 6: FIG. 6. Violin plots illustrate the distributions of SEM EDS composition measurements on as [PITH_FULL_IMAGE:figures/full_fig_p023_6.png]
Figure 7
Figure 7. Figure 7: FIG. 7. Characterization of NSP. (a) powder XRD. Curves show the observed pattern, refinement [PITH_FULL_IMAGE:figures/full_fig_p026_7.png]
Figure 8
Figure 8. Figure 8: FIG. 8. Experimentally measured and computationally predicted conductivity for Na [PITH_FULL_IMAGE:figures/full_fig_p028_8.png]
Figure 9
Figure 9. Figure 9: FIG. 9. Ionic conductivity behavior of [PITH_FULL_IMAGE:figures/full_fig_p029_9.png]

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Works this paper leans on

90 extracted references · 47 canonical work pages

  1. [1]

    Wang , author Y

    author author Q. Wang , author Y. Zhou , author X. Wang , author H. Guo , author S. Gong , author Z. Yao , author F. Wu , author J. Wang , author S. Ganapathy , author X. Bai , author B. Li , author C. Zhao , author J. Janek , \ and\ author M. Wagemaker ,\ 10.1038/s41467-024-45258-3 journal journal Nat. Commun. \ volume 15 ( year 2024 a ),\ 10.1038/s41467...

  2. [2]

    Ma \ and\ author Z

    author author J. Ma \ and\ author Z. Li ,\ 10.1021/accountsmr.3c00223 journal journal Acc. Mater. Res. \ volume 5 ,\ pages 523 ( year 2024 ) NoStop

  3. [3]

    Famprikis , author P

    author author T. Famprikis , author P. Canepa , author J. A. \ Dawson , author M. S. \ Islam , \ and\ author C. Masquelier ,\ 10.1038/s41563-019-0431-3 journal journal Nat. Mater. \ volume 18 ,\ pages 1278 ( year 2019 ) NoStop

  4. [4]

    Zhang , author F

    author author Y. Zhang , author F. Chen , author J. Li , author L. Zhang , author J. Gu , author D. Zhang , author K. Saito , author Q. Guo , author P. Luo , \ and\ author S. Dong ,\ 10.1016/j.electacta.2017.12.133 journal journal Electrochim. Acta \ volume 261 ,\ pages 137 ( year 2018 ) NoStop

  5. [5]

    Jun , author Y

    author author K. Jun , author Y. Sun , author Y. Xiao , author Y. Zeng , author R. Kim , author H. Kim , author L. J. \ Miara , author D. Im , author Y. Wang , \ and\ author G. Ceder ,\ 10.1038/s41563-022-01222-4 journal journal Nat. Mater. \ volume 21 ,\ pages 924 ( year 2022 ) NoStop

  6. [6]

    Xiao , author K

    author author Y. Xiao , author K. Jun , author Y. Wang , author L. J. \ Miara , author Q. Tu , \ and\ author G. Ceder ,\ 10.1002/aenm.202101437 journal journal Adv. Energy Mater. \ volume 11 ( year 2021 ),\ 10.1002/aenm.202101437 NoStop

  7. [7]

    He , author Q

    author author X. He , author Q. Bai , author Y. Liu , author A. M. \ Nolan , author C. Ling , \ and\ author Y. Mo ,\ 10.1002/aenm.201902078 journal journal Adv. Energy Mater. \ volume 9 ( year 2019 ),\ 10.1002/aenm.201902078 NoStop

  8. [8]

    Jun , author Y

    author author K. Jun , author Y. Chen , author G. Wei , author X. Yang , \ and\ author G. Ceder ,\ 10.1038/s41578-024-00715-9 journal journal Nat. Rev. Mater. \ ( year 2024 ),\ 10.1038/s41578-024-00715-9 NoStop

Show all 90 references
  1. [9]

    Kang , author M

    author author S. Kang , author M. Kim , \ and\ author K. Min ,\ 10.1021/acs.jpcc.3c02908 journal journal J. Phys. Chem. C \ volume 127 ,\ pages 19335 ( year 2023 ) NoStop

  2. [10]

    Zhang , author X

    author author Y. Zhang , author X. He , author Z. Chen , author Q. Bai , author A. M. \ Nolan , author C. A. \ Roberts , author D. Banerjee , author T. Matsunaga , author Y. Mo , \ and\ author C. Ling ,\ 10.1038/s41467-019-13214-1 journal journal Nat. Commun. \ volume 10 ( yea...

  3. [11]

    Wang , author J

    author author S. Wang , author J. Fu , author Y. Liu , author R. S. \ Saravanan , author J. Luo , author S. Deng , author T.-K. \ Sham , author X. Sun , \ and\ author Y. Mo ,\ 10.1038/s41467-023-43436-3 journal journal Nat. Commun. \ volume 14 ( year 2023 a ),\ 10.1038/s41467-...

  4. [12]

    Park , author W

    author author D. Park , author W. Chung , author B. K. \ Min , author U. Lee , author S. Yu , \ and\ author K. Kim ,\ 10.1038/s41524-024-01392-6 journal journal npj Comput. Mater. \ volume 10 ( year 2024 ),\ 10.1038/s41524-024-01392-6 NoStop

  5. [13]

    author author M. S. \ T. Takahashi , K. Kuwabara ,\ @noop ( year 1981 ) NoStop

  6. [15]

    Matsajuki , author O

    author author F. Matsajuki , author O. Masuru , \ and\ author A. Tatsumi ,\ @noop title Novel double phosphate , \ ( year 1983 ) NoStop

  7. [16]

    Maximov , author M

    author author B. Maximov , author M. Sirota , author S. Werner , \ and\ author H. Schulz ,\ 10.1107/s0108768198011239 journal journal Acta Crystallogr. B Struct. Sci. \ volume 55 ,\ pages 259 ( year 1999 ) NoStop

  8. [17]

    Klokova , author B

    author author N. Klokova , author B. Maksimov , \ and\ author R. Tamazyan ,\ @noop journal journal Kristallografiya \ volume 38 ,\ pages 56 ( year 1993 ) NoStop

  9. [18]

    Bolotina , author B

    author author N. Bolotina , author B. Maximov , author R. Tamazyan , \ and\ author N. Klokova ,\ @noop journal journal Kristallografiya \ volume 38 ,\ pages 51 ( year 1993 ) NoStop

  10. [19]

    Bolotina , author B

    author author N. Bolotina , author B. Maksimov , author V. Petricek , \ and\ author V. Simonov ,\ @noop journal journal Kristallografiya \ volume 40 ,\ pages 611 ( year 1995 ) NoStop

  11. [20]

    author author S. S. \ A.K. Ivanov-Shits , A ,\ 10.1016/0167-2738(90)90290-8 journal journal Solid State Ionics \ volume 40–41 ,\ pages 76 ( year 1990 ) NoStop

  12. [21]

    Duan \ and\ author R

    author author M. Duan \ and\ author R. Li ,\ 10.1039/c9ce01314h journal journal Cryst. Eng. Comm. \ volume 21 ,\ pages 6514 ( year 2019 ) NoStop

  13. [22]

    Lun , author B

    author author Z. Lun , author B. Ouyang , author D.-H. \ Kwon , author Y. Ha , author E. E. \ Foley , author T.-Y. \ Huang , author Z. Cai , author H. Kim , author M. Balasubramanian , author Y. Sun , author J. Huang , author Y. Tian , author H. Kim , author B. D. \ McCloskey ...

  14. [23]

    author author N. J. \ Szymanski , author B. Rendy , author Y. Fei , author R. E. \ Kumar , author T. He , author D. Milsted , author M. J. \ McDermott , author M. Gallant , author E. D. \ Cubuk , author A. Merchant , author H. Kim , author A. Jain , author C. J. \ Bartel , aut...

  15. [24]

    Fei , author B

    author author Y. Fei , author B. Rendy , author R. Kumar , author O. Dartsi , author H. P. \ Sahasrabuddhe , author M. J. \ McDermott , author Z. Wang , author N. J. \ Szymanski , author L. N. \ Walters , author D. Milsted , author Y. Zeng , author A. Jain , \ and\ author G. C...

  16. [25]

    author author G. C. \ Yuxing Fei , Matthew McDermott ,\ @noop journal journal tbd \ volume tbd ( year tbd ) NoStop

  17. [26]

    Doebelin \ and\ author R

    author author N. Doebelin \ and\ author R. Kleeberg ,\ 10.1107/s1600576715014685 journal journal J. Appl. Crystallogr. \ volume 48 ,\ pages 1573 ( year 2015 ) NoStop

  18. [27]

    Zagorac , author H

    author author D. Zagorac , author H. M\" u ller , author S. Ruehl , author J. Zagorac , \ and\ author S. Rehme ,\ 10.1107/s160057671900997x journal journal J. Appl. Crystallogr. \ volume 52 ,\ pages 918 ( year 2019 ) NoStop

  19. [28]

    author author G. C. \ Andrea Guinto ,\ @noop journal journal tbd \ volume tbd ( year tbd ) NoStop

  20. [29]

    Trincavelli , author G

    author author J. Trincavelli , author G. Castellano , \ and\ author J. A. \ Riveros ,\ 10.1002/(sici)1097-4539(199803/04)27:2<81::aid-xrs253>3.0.co;2-r journal journal X-Ray Spectrom. \ volume 27 ,\ pages 81 ( year 1998 ) NoStop

  21. [30]

    author author J. L. \ Lábár \ and\ author S. T\" o r\" o k ,\ 10.1002/xrs.1300210407 journal journal X-Ray Spectrom. \ volume 21 ,\ pages 183 ( year 1992 ) NoStop

  22. [31]

    Kresse \ and\ author J

    author author G. Kresse \ and\ author J. Hafner ,\ 10.1103/PhysRevB.47.558 journal journal Phys. Rev. B \ volume 47 ,\ pages 558 ( year 1993 ) NoStop

  23. [32]

    Kresse \ and\ author J

    author author G. Kresse \ and\ author J. Hafner ,\ 10.1103/PhysRevB.49.14251 journal journal Phys. Rev. B \ volume 49 ,\ pages 14251 ( year 1994 ) NoStop

  24. [33]

    Kresse \ and\ author J

    author author G. Kresse \ and\ author J. Furthm\"uller ,\ 10.1016/0927-0256(96)00008-0 journal journal Comput. Mater. Sci. \ volume 6 ,\ pages 15 ( year 1996 a ) NoStop

  25. [34]

    Kresse \ and\ author J

    author author G. Kresse \ and\ author J. Furthm\"uller ,\ 10.1103/PhysRevB.54.11169 journal journal Phys. Rev. B \ volume 54 ,\ pages 11169 ( year 1996 b ) NoStop

  26. [35]

    author author P. E. \ Bl\"ochl ,\ 10.1103/PhysRevB.50.17953 journal journal Phys. Rev. B \ volume 50 ,\ pages 17953 ( year 1994 ) NoStop

  27. [36]

    Kresse \ and\ author D

    author author G. Kresse \ and\ author D. Joubert ,\ 10.1103/PhysRevB.59.1758 journal journal Phys. Rev. B \ volume 59 ,\ pages 1758 ( year 1999 ) NoStop

  28. [37]

    author author J. P. \ Perdew , author K. Burke , \ and\ author M. Ernzerhof ,\ 10.1103/physrevlett.77.3865 journal journal Phys. Rev. Lett. \ volume 77 ,\ pages 3865 ( year 1996 ) NoStop

  29. [38]

    author author S. P. \ Ong , author W. D. \ Richards , author A. Jain , author G. Hautier , author M. Kocher , author S. Cholia , author D. Gunter , author V. L. \ Chevrier , author K. A. \ Persson , \ and\ author G. Ceder ,\ 10.1016/j.commatsci.2012.10.028 journal journal Comp...

  30. [39]

    Jain , author G

    author author A. Jain , author G. Hautier , author C. J. \ Moore , author S. Ping Ong , author C. C. \ Fischer , author T. Mueller , author K. A. \ Persson , \ and\ author G. Ceder ,\ 10.1016/j.commatsci.2011.02.023 journal journal Comput. Mater. Sci. \ volume 50 ,\ pages 2295...

  31. [40]

    Wang , author R

    author author A. Wang , author R. Kingsbury , author M. McDermott , author M. Horton , author A. Jain , author S. P. \ Ong , author S. Dwaraknath , \ and\ author K. A. \ Persson ,\ 10.1038/s41598-021-94550-5 journal journal Sci. Rep. \ volume 11 ( year 2021 ),\ 10.1038/s41598-...

  32. [41]

    Jain , author G

    author author A. Jain , author G. Hautier , author S. P. \ Ong , author C. J. \ Moore , author C. C. \ Fischer , author K. A. \ Persson , \ and\ author G. Ceder ,\ 10.1103/physrevb.84.045115 journal journal Phys. Rev. B \ volume 84 ( year 2011 b ),\ 10.1103/physrevb.84.045115 NoStop

  33. [42]

    Fultz ,\ 10.1016/j.pmatsci.2009.05.002 journal journal Prog

    author author B. Fultz ,\ 10.1016/j.pmatsci.2009.05.002 journal journal Prog. Mater. Sci. \ volume 55 ,\ pages 247 ( year 2010 ) NoStop

  34. [43]

    Togo \ and\ author I

    author author A. Togo \ and\ author I. Tanaka ,\ 10.1016/j.scriptamat.2015.07.021 journal journal Scr. Mater. \ volume 108 ,\ pages 1 ( year 2015 ) NoStop

  35. [44]

    Hinuma , author G

    author author Y. Hinuma , author G. Pizzi , author Y. Kumagai , author F. Oba , \ and\ author I. Tanaka ,\ 10.1016/j.commatsci.2016.10.015 journal journal Comp. Mat. Sci. \ volume 128 ,\ pages 140 ( year 2017 ) NoStop

  36. [45]

    Togo \ and\ author I

    author author A. Togo \ and\ author I. Tanaka ,\ @noop title Spglib : a software library for crystal symmetry search , \ ( year 2018 ),\ http://arxiv.org/abs/1808.01590 arXiv:1808.01590 [cond-mat.mtrl-sci] NoStop

  37. [46]

    Deng , author P

    author author B. Deng , author P. Zhong , author K. Jun , author J. Riebesell , author K. Han , author C. J. \ Bartel , \ and\ author G. Ceder ,\ 10.1038/s42256-023-00716-3 journal journal Nat. Mach. Intell. \ volume 5 ,\ pages 1031– ( year 2023 ) NoStop

  38. [47]

    Vandermause , author S

    author author J. Vandermause , author S. B. \ Torrisi , author S. Batzner , author Y. Xie , author L. Sun , author A. M. \ Kolpak , \ and\ author B. Kozinsky ,\ 10.1038/s41524-020-0283-z journal journal npj Comput. Mater. \ volume 6 ( year 2020 ),\ 10.1038/s41524-020-0283-z NoStop

  39. [48]

    author author H. J. C. \ Berendsen , author J. P. M. \ Postma , author W. F. \ van Gunsteren , author A. DiNola , \ and\ author J. R. \ Haak ,\ 10.1063/1.448118 journal journal J. Chem. Phys. \ volume 81 ,\ pages 3684 ( year 1984 ) NoStop

  40. [49]

    He , author Y

    author author X. He , author Y. Zhu , author A. Epstein , \ and\ author Y. Mo ,\ 10.1038/s41524-018-0074-y journal journal npj Comput. Mater. \ volume 4 ( year 2018 ),\ 10.1038/s41524-018-0074-y NoStop

  41. [51]

    author author M. J. \ McDermott , author B. C. \ McBride , author C. E. \ Regier , author G. T. \ Tran , author Y. Chen , author A. A. \ Corrao , author M. C. \ Gallant , author G. E. \ Kamm , author C. J. \ Bartel , author K. W. \ Chapman , author P. G. \ Khalifah , author G....

  42. [53]

    Chen , author S

    author author J. Chen , author S. R. \ Cross , author L. J. \ Miara , author J.-J. \ Cho , author Y. Wang , \ and\ author W. Sun ,\ 10.1038/s44160-024-00502-y journal journal Nat. Synth. \ volume 3 ,\ pages 606 ( year 2024 ) NoStop

  43. [54]

    author author S. P. \ Ong , author L. Wang , author B. Kang , \ and\ author G. Ceder ,\ 10.1021/cm702327g journal journal Chem. Mater. \ volume 20 ,\ pages 1798 ( year 2008 ) NoStop

  44. [55]

    Jain , author S

    author author A. Jain , author S. P. \ Ong , author G. Hautier , author W. Chen , author W. D. \ Richards , author S. Dacek , author S. Cholia , author D. Gunter , author D. Skinner , author G. Ceder , \ and\ author K. A. \ Persson ,\ 10.1063/1.4812323 journal journal APL Mate...

  45. [56]

    Sun , author S

    author author W. Sun , author S. T. \ Dacek , author S. P. \ Ong , author G. Hautier , author A. Jain , author W. D. \ Richards , author A. C. \ Gamst , author K. A. \ Persson , \ and\ author G. Ceder ,\ 10.1126/sciadv.1600225 journal journal Sci. Adv. \ volume 2 ( year 2016 )...

  46. [57]

    Aykol , author S

    author author M. Aykol , author S. S. \ Dwaraknath , author W. Sun , \ and\ author K. A. \ Persson ,\ 10.1126/sciadv.aaq0148 journal journal Sci. Adv. \ volume 4 ( year 2018 ),\ 10.1126/sciadv.aaq0148 NoStop

  47. [59]

    Aykol , author J

    author author M. Aykol , author J. H. \ Montoya , \ and\ author J. Hummelshøj ,\ 10.1021/jacs.1c04888 journal journal J. Am. Chem. Soc. \ volume 143 ,\ pages 9244 ( year 2021 ) NoStop

  48. [60]

    author author J. R. \ Chamorro \ and\ author T. M. \ McQueen ,\ 10.1021/acs.accounts.8b00382 journal journal Acc. Chem. Res. \ volume 51 ,\ pages 2918 ( year 2018 ) NoStop

  49. [61]

    author author N. J. \ Szymanski , author Y.-W. \ Byeon , author Y. Sun , author Y. Zeng , author J. Bai , author M. Kunz , author D.-M. \ Kim , author B. A. \ Helms , author C. J. \ Bartel , author H. Kim , \ and\ author G. Ceder ,\ 10.1126/sciadv.adp3309 journal journal Sci. ...

  50. [62]

    author author W. D. \ Richards , author L. J. \ Miara , author Y. Wang , author J. C. \ Kim , \ and\ author G. Ceder ,\ 10.1021/acs.chemmater.5b04082 journal journal Chem. Mater. \ volume 28 ,\ pages 266 ( year 2015 ) NoStop

  51. [63]

    Xiao , author Y

    author author Y. Xiao , author Y. Wang , author S.-H. \ Bo , author J. C. \ Kim , author L. J. \ Miara , \ and\ author G. Ceder ,\ 10.1038/s41578-019-0157-5 journal journal Nat. Rev. Mater. \ volume 5 ,\ pages 105 ( year 2019 ) NoStop

  52. [64]

    author author V. A. \ Nicholas , author A. M. \ Heyns , author A. I. \ Kingon , \ and\ author J. B. \ Clark ,\ 10.1007/bf00547935 journal journal J. Mater. Sci. \ volume 21 ,\ pages 1967 ( year 1986 ) NoStop

  53. [65]

    Waskom ,\ 10.21105/joss.03021 journal journal J

    author author M. Waskom ,\ 10.21105/joss.03021 journal journal J. Open Source Softw. \ volume 6 ,\ pages 3021 ( year 2021 ) NoStop

  54. [66]

    author author N. H. \ Makani , author A. Sahoo , author P. Pal , author T. Paul , author L. S. \ Tanwar , author M. Singh , author A. Ghosh , \ and\ author R. Banerjee ,\ 10.1103/physrevmaterials.6.115002 journal journal Phys. Rev. Mater. \ volume 6 ( year 2022 ),\ 10.1103/phy...

  55. [67]

    Chen , author Q

    author author R. Chen , author Q. Li , author X. Yu , author L. Chen , \ and\ author H. Li ,\ 10.1021/acs.chemrev.9b00268 journal journal Chem. Rev. \ volume 120 ,\ pages 6820 ( year 2019 ) NoStop

  56. [68]

    Minkiewicz , author G

    author author J. Minkiewicz , author G. M. \ Jones , author S. Ghanizadeh , author S. Bostanchi , author T. J. \ Wasely , author S. A. \ Yamini , \ and\ author V. Nekouie ,\ 10.1016/j.oceram.2023.100497 journal journal Open Ceram. \ volume 16 ,\ pages 100497 ( year 2023 ) NoStop

  57. [69]

    Wang , author W

    author author Y. Wang , author W. D. \ Richards , author S. P. \ Ong , author L. J. \ Miara , author J. C. \ Kim , author Y. Mo , \ and\ author G. Ceder ,\ 10.1038/nmat4369 journal journal Nat. Mater. \ volume 14 ,\ pages 1026 ( year 2015 ) NoStop

  58. [70]

    Li , author P

    author author Z. Li , author P. Liu , author K. Zhu , author Z. Zhang , author Y. Si , author Y. Wang , \ and\ author L. Jiao ,\ 10.1021/acs.energyfuels.1c00347 journal journal Energy Fuels \ volume 35 ,\ pages 9063 ( year 2021 ) NoStop

  59. [71]

    Ma \ and\ author F

    author author Q. Ma \ and\ author F. Tietz ,\ 10.1002/celc.202000164 journal journal Chem. Electro. Chem. \ volume 7 ,\ pages 2693 ( year 2020 ) NoStop

  60. [72]

    Fu , author Y

    author author C. Fu , author Y. Li , author W. Xu , author X. Feng , author W. Gu , author J. Liu , author W. Deng , author W. Wang , author A. M. M. \ Abeykoon , author L. Su , author L. Zhu , author X. Wu , \ and\ author H. Xiang ,\ 10.1038/s41467-024-48712-4 journal journal...

  61. [73]

    Wang , author Z

    author author Q. Wang , author Z. Jiang , author C. Yu , author L. Li , \ and\ author G. Li ,\ 10.1016/j.cclet.2024.110006 journal journal Chin. Chem. Lett. \ ,\ pages 110006 ( year 2024 b ) NoStop

  62. [74]

    Liu , author L

    author author Y. Liu , author L. Liu , author J. Peng , author X. Zhou , author D. Liang , author L. Zhao , author J. Su , author B. Zhang , author S. Li , author N. Zhang , author Q. Ma , \ and\ author F. Tietz ,\ 10.1016/j.jpowsour.2021.230765 journal journal J. Power Source...

  63. [75]

    Wang , author T

    author author J. Wang , author T. He , author X. Yang , author Z. Cai , author Y. Wang , author V. Lacivita , author H. Kim , author B. Ouyang , \ and\ author G. Ceder ,\ 10.1038/s41467-023-40669-0 journal journal Nat. Commun. \ volume 14 ( year 2023 b ),\ 10.1038/s41467-023-4...

  64. [76]

    Dai , author S

    author author T. Dai , author S. Vijayakrishnan , author F. T. \ Szczypiński , author J.-F. \ Ayme , author E. Simaei , author T. Fellowes , author R. Clowes , author L. Kotopanov , author C. E. \ Shields , author Z. Zhou , author J. W. \ Ward , \ and\ author A. I. \ Cooper ,\...

  65. [77]

    Khaoulaf , author P

    author author R. Khaoulaf , author P. Adhikari , author M. Harcharras , author K. Brouzi , author H. Ez-Zahraouy , \ and\ author W.-Y. \ Ching ,\ 10.3390/app9050840 journal journal Appl. Sci. \ volume 9 ,\ pages 840 ( year 2019 ) NoStop

  66. [78]

    Song , author T

    author author X. Song , author T. Zhang , author T. D. \ Christopher , author Y. Guo , author S. Huang , author Y. Liu , author T. S\" o hnel , \ and\ author P. Cao ,\ 10.1016/j.jeurceramsoc.2022.04.059 journal journal J. Eur. Ceram. Soc. \ volume 42 ,\ pages 5023 ( year 2022 ) NoStop

  67. [79]

    Sazvar , author H

    author author A. Sazvar , author H. Sarpoolaky , \ and\ author M. Golmohammad ,\ 10.1080/17436753.2023.2265193 journal journal Adv. Appl. Ceram. Struct. Funct. Bioceram. \ volume 122 ,\ pages 336 ( year 2023 ) NoStop

  68. [80]

    Wang , author H

    author author C. Wang , author H. Xie , author W. Ping , author J. Dai , author G. Feng , author Y. Yao , author S. He , author J. Weaver , author H. Wang , author K. Gaskell , \ and\ author L. Hu ,\ 10.1016/j.ensm.2018.11.007 journal journal Energy Storage Mater. \ volume 17 ...

  69. [81]

    Swanson , author M

    author author M. Swanson , author M. Sunder , author N. Tangtrakarn , author L. Krishna , \ and\ author P. Moran ,\ 10.1016/j.ssi.2011.02.010 journal journal Solid State Ion. \ volume 189 ,\ pages 45 ( year 2011 ) NoStop

  70. [82]

    Sharafi , author E

    author author A. Sharafi , author E. Kazyak , author A. L. \ Davis , author S. Yu , author T. Thompson , author D. J. \ Siegel , author N. P. \ Dasgupta , \ and\ author J. Sakamoto ,\ 10.1021/acs.chemmater.7b03002 journal journal Chem. Mater. \ volume 29 ,\ pages 7961 ( year 2...

  71. [83]

    author author S. R. \ Catarelli , author D. Lonsdale , author L. Cheng , author J. Syzdek , \ and\ author M. Doeff ,\ 10.3389/fenrg.2016.00014 journal journal Front. Energy Res. \ volume 4 ( year 2016 ),\ 10.3389/fenrg.2016.00014 NoStop

  72. [84]

    J.; He, T.; Trewartha, A.; Dunn, A.; Ouyang, B.; Jain, A.; Ceder, G

    Huo, H.; Bartel, C. J.; He, T.; Trewartha, A.; Dunn, A.; Ouyang, B.; Jain, A.; Ceder, G. Machine-Learning Rationalization and Prediction of Solid-State Synthesis Conditions. Chem. Mater. 2022, 34, 7323–--7336, DOI: doi:10.1021/acs.chemmater.2c01293

  73. [85]

    J.; Dwaraknath, S

    McDermott, M. J.; Dwaraknath, S. S.; Persson, K. A. A graph-based network for predicting chemical reaction pathways in solid-state materials synthesis. Nat. Commun. 2021, 12, DOI: doi:10.1038/s41467-021-23339-x

  74. [86]

    J.; McBride, B

    McDermott, M. J.; McBride, B. C.; Regier, C. E.; Tran, G. T.; Chen, Y.; Corrao, A. A.; Gallant, M. C.; Kamm, G. E.; Bartel, C. J.; Chapman, K. W.; Khalifah, P. G.; Ceder, G.; Neilson, J. R.; Persson, K. A. Assessing Thermodynamic Selectivity of Solid-State Reactions for the Pr...

  75. [87]

    J.; Millican, S

    Bartel, C. J.; Millican, S. L.; Deml, A. M.; Rumptz, J. R.; Tumas, W.; Weimer, A. W.; Lany, S.; Stevanović, V.; Musgrave, C. B.; Holder, A. M. Physical descriptor for the Gibbs energy of inorganic crystalline solids and temperature-dependent materials chemistry. Nat. Commun. 2...

  76. [88]

    NIST-JANAF Thermochemical Tables, 4th Edition; American Institute of Physics, -1, 1998

    Malcolm, W.; Chase, J. NIST-JANAF Thermochemical Tables, 4th Edition; American Institute of Physics, -1, 1998

  77. [89]

    Andrea Guinto, G. C. Accurate EDS Fitting. tbd tbd, tbd

  78. [90]

    Donohue, P. C. Synthesis, structure, and superconducting properties of new high-pressure forms of tin phosphide. Inorg. Chem. 1970, 9, 335--337, DOI: doi:10.1021/ic50084a032

  79. [91]

    Synthesis, Crystal Structure, and Characterizations of Two Tantalum Phosphates A3TaP2O9 (A=K, Na)

    Lv, Z.; Li, R. Synthesis, Crystal Structure, and Characterizations of Two Tantalum Phosphates A3TaP2O9 (A=K, Na). Inorg. Chem. 2022, 61, 13554--13560, DOI: doi:10.1021/acs.inorgchem.2c02186

  80. [92]

    Structure of a modulated monoclinic phase of Na4TiP2O9

    Maximov, B.; Bolotina, N.; Simonov, V.; Petřiček, V.; Schulz, H. Structure of a modulated monoclinic phase of Na4TiP2O9. Acta Crystallogr. B Struct. Sci. 1994, 50, 261--268, DOI: doi:10.1107/s0108768193009917

  81. [93]

    Takahashi, M

    T. Takahashi, M. S., K. Kuwabara 1981

  82. [94]

    " id="W5M0MpCehiHzreSzNTczkc9d

    Deng, B.; Zhong, P.; Jun, K.; Riebesell, J.; Han, K.; Bartel, C. J.; Ceder, G. CHGNet as a pretrained universal neural network potential for charge-informed atomistic modelling. Nat. Mach. Intell. 2023, 5, 1031–--1041, DOI: doi:10.1038/s42256-023-00716-3 mcitethebibliography S...

Pith tools

Reviewed August 10, 2026 · model on record in the stance chip above.