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Comparative study on heterophase structures in ferroelectric solid solutions based on barium titanate
Author(s) -
Topolov VitalyYu.,
Kalyani Ajay Kumar,
Brajesh Kumar,
Ranjan Rajeev,
Panich Anatoly E.
Publication year - 2017
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.201600299
Subject(s) - barium titanate , ferroelectricity , materials science , barium , solid solution , condensed matter physics , mineralogy , chemical engineering , composite material , ceramic , chemistry , metallurgy , dielectric , optoelectronics , physics , engineering
Heterophase structures are first compared for related perovskite‐type ferroelectric solid solutions that are tin‐modified barium titanate and hafnium‐modified barium titanate with compositions near the morphotropic phase boundary. The studied heterophase structures are interpreted in terms of two models wherein two polydomain phases and a single‐domain interlayer or polydomain and single‐domain phases and a polydomain interlayer coexist at the complete stress relief. The role of the non‐180° domain types and unit‐cell parameters of the coexisting phases is highlighted to show the important link between the phase contents and unit‐cell parameters near the morphotropic phase boundary. A link between the heterophase/polydomain regions and piezoelectric activity of the ferroelectric solid solutions is discussed. Results on the phase contents in the morphotropic region are consistent with experimental data on the aforementioned solid solutions based on barium titanate.