Anomalous properties of Am−1Bi2BmO3m+3 layered ferroelectrics
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- Isupov, V.A. Inorg Mater (2006) 42: 1236. doi:10.1134/S0020168506110112
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Statistical analysis is presented of the literature data on the properties of Am−1Bi2BmO3m+3 layered ferroelectrics consisting of alternating perovskite-like slabs and bismuth-oxygen layers. The results reveal new and confirm some of the known tendencies. The Bi-O layers are shown to tighten the structure of these compounds, and the effect becomes stronger with decreasing slab thickness. As the distortion of the pseudoperovskite cells in the perovskite-like slabs increases, the Curie temperature TC passes through a maximum. Its position depends on the slab thickness (m). Thus, at strong lattice distortions, TC decreases with increasing distortion, in conflict with the Abrahams-Kurtz-Jamieson relation. The observed anomalies are tentatively attributed to changes in the nature of ion displacements.