Russian Journal of Physical Chemistry A

, Volume 92, Issue 4, pp 646–652 | Cite as

Standard Thermodynamic Functions of Crystalline Arsenate Mg0.5Zr2(AsO4)3 in the Range from T → 0 to 670 K

  • V. I. Pet’kov
  • A. S. Shipilov
  • A. V. Markin
  • N. N. Smirnova
Chemical Thermodynamics and Thermochemistry
  • 6 Downloads

Abstract

The temperature dependence of heat capacity C° p = f(T) of crystalline arsenate Mg0.5Zr2(AsO4)3 was studied by precision adiabatic vacuum and differential scanning calorimetry in the temperature range 8−670 K. The standard thermodynamic functions C° p (T), H°(T)–H°(0), S°(T), and G°(T)–H°(0) of the arsenate for the range from Т → 0 to 670 K and the standard formation entropy at Т = 298.15 K were calculated from the obtained experimental data. Based on the low-temperature capacity data (30–50 K) the fractal dimension D of the arsenate was determined, and the topology of its structure was characterized. The results were compared with the thermodynamic data for the structurally related crystalline phosphates M0.5Zr2(PO4)3 (M = Mg, Ca, Sr, Ba, Ni) and arsenate NaZr2(AsO4)3.

Keywords

heat capacity precision adiabatic vacuum and differential scanning calorimetry arsenate Mg0.5Zr2(AsO4)3 

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Copyright information

© Pleiades Publishing, Ltd. 2018

Authors and Affiliations

  • V. I. Pet’kov
    • 1
  • A. S. Shipilov
    • 1
  • A. V. Markin
    • 1
  • N. N. Smirnova
    • 1
  1. 1.Lobachevskii State UniversityNizhny NovgorodRussia

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