Synthesis, Crystal Structure and Thermodynamic Properties of LuGaTi2O7.

Single-phase LuGaTi₂O₇ samples have been prepared by solid-state reaction in a starting mixture of Lu₂O₃, Ga₂O₃, and TiO₂ via sequential firing in air at temperatures of 1273 and 1573 K. The crystal structure of the lutetium gallium dititanate has been determined by the Rietveld method (profile analysis of X-ray diffraction patterns of polycrystalline powders): sp. gr. Pcnb; a = 9.75033(13) Å, b = 13.41425(17) Å, c = 7.29215(9) Å, V = 957.32(2) ų, d = 6.28 g/cm³. The heat capacity of LuGaTi₂O₇ has been determined as a function of temperature by differential scanning calorimetry in the range 320–1000 K. The C_p(T) data thus obtained have been used to calculate the principal thermodynamic functions of the oxide compound. [ABSTRACT FROM AUTHOR]