Standard Thermodynamic Functions of Crystalline Arsenate Mg0.5Zr2(AsO4)3 in the Range from T → 0 to 670 K
- Authors: Pet’kov V.I.1, Shipilov A.S.1, Markin A.V.1, Smirnova N.N.1
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Affiliations:
- Lobachevskii State University
- Issue: Vol 92, No 4 (2018)
- Pages: 646-652
- Section: Chemical Thermodynamics and Thermochemistry
- URL: https://bakhtiniada.ru/0036-0244/article/view/169952
- DOI: https://doi.org/10.1134/S0036024418040246
- ID: 169952
Cite item
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.
About the authors
V. I. Pet’kov
Lobachevskii State University
Author for correspondence.
Email: petkov@inbox.ru
Russian Federation, Nizhny Novgorod, 603950
A. S. Shipilov
Lobachevskii State University
Email: petkov@inbox.ru
Russian Federation, Nizhny Novgorod, 603950
A. V. Markin
Lobachevskii State University
Email: petkov@inbox.ru
Russian Federation, Nizhny Novgorod, 603950
N. N. Smirnova
Lobachevskii State University
Email: petkov@inbox.ru
Russian Federation, Nizhny Novgorod, 603950
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