Atomic Layer Engineering of Ferroelectricity in Dion-Jacobson Perovskites.

Recent advances in "hybrid-improper" ferroelectricity in Dion-Jacobson (DJ)-type layered perovskites have caused renewed interest in the search for new ferroelectrics. Here, we present an approach for the tailored synthesis of a new homologous series of DJ-type layered perovskites Cs(BiSr)(TiNb)O. Starting from CsBiTiNbO ( = 3), higher-order homologous phases with = 4 and 5 were successfully synthesized by repeated solid-state calcination with SrTiO.