Thermodynamic Properties and Thermal Expansion of Gd2Sn2O7 at High Temperatures

Measuring data are presented for the molar heat capacity of pyrochlore gadolinium stannate and its thermodynamic functions are calculated in the 298.15–1350 K range of temperatures. The Gibbs energy of formation of gadolinium stannate from gadolinium(III) and tin(IV) oxides is estimated. High-temperature diffraction is used to determine the cubic lattice parameter of Gd 2 Sn 2 O 7 as a function of temperature, and the coefficients of thermal expansion in the range of 299–1273 K were calculated.