Structure–property relations in doped perovskite oxides

Abstract

A review of experimental work on A cation size effects in perovskites such as AMnO₃ CMR materials, A₂CuO₄ and ABa₂Cu₃O_7−x superconductors and ATiO₃ ferroelectrics is presented. These show that the mean A cation radius and cation size variance are both important parameters that control properties. These parameters can be used to construct global phase diagrams for perovskites. A simple model is proposed to account for the dependences of transition temperatures upon these functionals.