Understanding ferroelectricity in layered perovskites: new ideas and insights from theory and experiments

作者: Nicole A. Benedek , James M. Rondinelli , Hania Djani , Philippe Ghosez , Philip Lightfoot

DOI: 10.1039/C5DT00010F

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摘要: ABO3 perovskites have fascinated solid-state chemists and physicists for decades because they display a seemingly inexhaustible variety of chemical physical properties. However, despite the diversity properties found among perovskites, very few these materials are ferroelectric, or even polar, in bulk. In this Perspective, we highlight recent theoretical experimental studies that shown how combination non-polar structural distortions, commonly tilts rotations BO6 octahedra, can give rise to polar structures ferroelectricity several families layered perovskites. We discuss crystal origin polarization each – which emerges through so-called ‘trilinear coupling’ ‘hybrid improper’ mechanism emphasize areas further investigation is needed. also consider may provide generic route designing not only new ferroelectrics, but with various other multifunctionalities, such as magnetoelectrics electric field-controllable metal-insulator transitions.

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