Thermodynamic Properties of the MZr2(PO4)3 (M=Na,K, Rb or Cs) Compounds |
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| Authors: | Pet'kov V I Kir'yanov K V Orlova A I Kitaev D B |
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| Institution: | (1) Department of Chemistry, Nizhni Novgorod State University, Gagarin av. 23, 603950 Nizhni Novgorod, Russia |
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| 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.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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| Keywords: | alkali-zirconium phosphates enthalpies of solution heat capacity NZP structure thermodynamic functions |
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