# Effect of pressure on the order-disorder phase transitions of $B$-cations in $AB'_{1/2}B''_{1/2}$O$_3$ perovskites

## TL;DR

This study extends a statistical model to analyze how pressure influences the order-disorder phase transitions of B-cations in perovskite oxides, revealing that pressure can significantly alter transition temperatures and atomic ordering.

## Contribution

The paper introduces an extended model that incorporates pressure effects into the understanding of phase transitions in perovskite oxides, providing new insights into pressure-induced changes in atomic ordering.

## Key findings

- Pressure can increase or decrease transition temperatures depending on composition.
- Transition temperature changes can reach several hundred kelvin at laboratory-accessible pressures.
- Pressure significantly affects the atomic ordering degree in perovskite oxides.

## Abstract

Perovskite-like oxides $AB'_{1/2}B''_{1/2}$O$_3$ may experience different ordering degrees of $B$-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 composition, pressure is found to either increase or decrease the order-disorder phase transition temperature. The change of transition temperature due to pressure in many cases reaches several hundreds of kelvin at pressures accessible in laboratory, which may significantly change the atomic ordering degree. The work is intended to help determining how pressure influences the degree of atomic ordering and stimulate research of the effect of pressure on atomic order-disorder phase transitions in perovskites.