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Heat capacities of nanostructured wurtzite and rock salt ZnO: challenges of ZnO nano-phase diagram

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arxiv 2101.05668 v1 pith:AIGZLFWK submitted 2021-01-14 cond-mat.mtrl-sci

Konstantin V. Kamenev , Alexandre Courac , Petr S. Sokolov , Andrei N. Baranov , Felix Yu. Sharikov , Vladimir L. Solozhenko This is my paper · ORCID
classification cond-mat.mtrl-sci
keywords rocksalttemperaturew-znowurtzitecapacitiesheatmeasured
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Low-temperature heat capacities (Cp) of nanostructured rock salt (rs-ZnO) and wurtzite (w-ZnO) polymorphs of zinc oxide were measured in the 2-315 K temperature range. No significant influence of nanostructuring on Cp of w-ZnO has been observed. The measured Cp of rock salt ZnO is lower than that of wurtzite ZnO below 100 K and is higher above this temperature. Using available thermodynamic data, we established that the equilibrium pressure between nanocrystalline w-ZnO and rs-ZnO is close to 4.6 GPa at 300 K (half as much as the onset pressure of direct phase transformation) and slightly changes with temperature up to 1000 K.

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