2020
DOI: 10.1016/j.jfluchem.2020.109523
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Calorimetric, dilatometric and DTA under pressure studies of the phase transitions in elpasolite (NH4)2KZrF7

Abstract: Heat capacity, thermal expansion, and sensitivity to the hydrostatic pressure of (NH 4 ) 2 KZrF 7 elpasolite are studied in a wide temperature range. The changes in deformation and entropy during successive phase transitions are determined: ∆(∆V /V ) = 3•10 −4 ; ∆S = 8 J/mol•K. The temperatures and entropies of phase transitions turned out to be slightly sensitive to pressure changes. An analysis of the entropy of phase transformations was performed in the framework of the model of the cubic phase structure F … Show more

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