Synthesis, Structure, and Thermal Properties of Ca 5 Ga 6 O 14

Calcium gallate Ca5Ga6O14 is synthesized by solid-phase means. Its melting point is 1325 ± 2°C. A phase transition of the second kind is observed in the temperature interval of 750–800°C. The temperature dependence of a thermal linear expansion coefficient within 200–900°C is given. Vibrational spectroscopy data confirm that Ca5Ga6O14 contains not only GaO4 tetrahedra but also GaO6 octahedra.