Thermodynamic Properties of Lutetium Stannate Lu2Sn2O7 in the Temperature Range of 0-1871 K

被引：1

作者：

Ryumin, M. A. ^{[1
]}

Tyurin, A. V. ^{[1
]}

Khoroshilov, A. V. ^{[1
]}

Nikiforova, G. E. ^{[1
]}

Gavrichev, K. S. ^{[1
]}

机构：

[1] Russian Acad Sci, Kurnakov Inst Gen & Inorgan Chem, Moscow 119991, Russia

来源：

RUSSIAN JOURNAL OF INORGANIC CHEMISTRY | 2024年 / 69卷 / 08期

关键词：

stannates; lutetium; heat capacity; thermal expansion; HEAT-CAPACITY; PYROCHLORES; RE; LA; STABILITY; TITANATES; ENTHALPY; YB2SN2O7; LU; GD;

D O I：

10.1134/S0036023624601132

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Lutetium stannate with a pyrochlore structure was synthesized using solid state reaction. The heat capacity of polycrystalline Lu2Sn2O7 in the temperature range of 7.99-1871 K was measured by adiabatic and differential scanning calorimetry methods. Entropy, enthalpy change, and derived Gibbs energy were calculated from the smoothed heat capacity data. The Gibbs free energy of Lutetium stannate from elements was estimated, using the Delta S-f degrees(& Tcy;) values obtained in this work and the Delta H-f degrees(& Tcy;) values known from the literature. The temperature dependence of the cubic crystal lattice parameter and the value of the coefficient of thermal expansion in the temperature range of 300-1273 K were determined by high-temperature X-ray diffraction.

引用

页码：1195 / 1203

页数：9

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