Dielectric properties depend on the crystal structure of perovskite-type RbTaO3 synthesized at high pressure

We prepared perovskite-type RbTaO 3 at 1173 K and 4 GPa. It was cubic cell at 300 K, and showed phase transitions at 270 K with tetragonal and 80 K with orthorhombic. The relative permittivity was varied corresponding to the phase transitions.