High‐Pressure Perovskite: Synthesis, Structure, and Phase Relation

Abstract

A huge number of compounds with chemical formula ABX 3 adopt the perovskite (Pv)‐type structure or its distorted derivatives. Studies on Pv‐type and related compounds synthesized under high pressures and high temperatures or stable under high pressure have been developed by large contributions of earth science as well as materials science and engineering. In the field of solid‐state chemistry, the stabilization of Pv‐phase by high pressure, the phase relation under various pressure‐temperature conditions, and the structure and properties of obtained metastable Pv phases have been elucidated. This chapter reviews syntheses of high‐pressure Pv in terms of synthetic methods, phase stability, structure, and chemical bonding. Synthetic methods of Pvs aided by pressure, from relative low gas pressure of ∼1 MPa to hydrostatic pressure in solid medium on the order of 10 GPa and the examples.

High-Pressure Synthesis, Crystal Structure, Chemical Bonding, and Ferroelectricity of LiNbO3-Type LiSbO3

“…14 Therefore, stabilization of polar materials with LN-type structure has been extensively performed. 15 On the other hand, ferroelectricity characterized by an electric polarization reversal by an applied electric field cannot necessarily be realized in all of the polar materials because of the high cohesive electric field, electronic conductive nature of the materials, and so on. For instance, although polarization switching has been reported in a thin film of LN-type ZnSnO 3 , 16 such switching has not been realized in bulk ZnSnO 3 .…”

“…Although one of the LN-type oxides, ZnSnO 3 , does not possess SOJT active cations, it does exhibit polarity . Therefore, stabilization of polar materials with LN-type structure has been extensively performed . On the other hand, ferroelectricity characterized by an electric polarization reversal by an applied electric field cannot necessarily be realized in all of the polar materials because of the high cohesive electric field, electronic conductive nature of the materials, and so on.…”