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

Abstract : 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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https://hal.archives-ouvertes.fr/hal-03155807
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Submitted on : Wednesday, March 10, 2021 - 4:29:16 PM
Last modification on : Friday, March 12, 2021 - 3:28:44 AM

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Konstantin Kamenev, Alexandre Courac, Petr Sokolov, Andrei Baranov, Felix Yu. Sharikov, et al.. Heat capacities of nanostructured wurtzite and rock salt ZnO: Challenges of ZnO nano-phase diagram. Solids, MDPI, 2021, 2 (1), pp.121-128. ⟨10.3390/solids2010007⟩. ⟨hal-03155807⟩

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