Abstract
The enthalpies of the solution of MZr2(PO4)3(M=Na, K, Rb or Cs) compounds have been measured by the help of a differential automatic isothermal Calvet calorimeter and the standard enthalpies of formation have been derived. The temperature dependencies of the standard heat capacity of the samples of crystalline NaZr2(PO4)3 and CsZr2(PO4)3 were studied between 7 and 340 K in an automatic adiabatic vacuum calorimeter. The main thermodynamic functions H 0(T)–H 0(0), S 0(T) andG 0(T)–H 0(0) have been determined. The Gibbs energies of formation of the NaZr2(PO4)3and CsZr2(PO4)3 at 298.15 K were calculated on the basis of these experimental data and the enthalpy of formation data. Qualitative explanations for the results observed were presented.
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