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


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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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