DETERMINATION OF THERMODYNAMIC FUNCTIONS OF PHASE TRANSITION OF Cu8SiSe6 COMPOUND BY THE DSC METHOD

Abstract

The ternary compound Cu8SiSe6 was studied by differential scanning calorimetry (DSC). Based on the data of DSC curves for two samples with different masses, the temperature and enthalpy of the phase transition from the low-temperature orthorhombic modification to the high-temperature cubic modification were determined. Using the Gibbs-Helmholtz equation, the entropy of the phase transition of the studied compound was also calculated.

CALORIMETRIC STUDY OF PHASE TRANSITION OF Cu8GeSe6 AND COMPARISON WITH OTHER ARGYRODITE FAMILY COMPOUNDS

“…The heating rate was 3°/min. The process of calorimeter calibration and measurements are described in detail in our previous similar works [23][24][25].…”

“…The thermodynamic characteristics of these transitions for some compounds of the argyrodite family were determined by the EMF method with a solid electrolyte in [19][20][21][22]. In [23][24][25], we studied a number of argyrodite compounds using differential scanning calorimetry (DSC), which is considered to be one of the accurate methods in thermal analysis.…”