Effect of pressure on the order-disorder phase transitions of B cations in AB'B''O perovskites.

Perovskite-like oxides AB'B''O may experience different degrees of ordering of the B cations that can be varied by suitable synthesis conditions or post-synthesis treatment. In this work the earlier proposed statistical model of order-disorder phase transitions of B cations is extended to account for the effect of pressure. Depending on the composition, pressure is found to either increase or decrease the order-disorder phase transition temperature.