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Heterophase states and a bridging phase in (1‐ x )BiScO 3 − x PbTiO 3
Author(s) -
Topolov V. Yu.
Publication year - 2012
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.201200243
Subject(s) - phase (matter) , phase boundary , ferroelectricity , materials science , volume fraction , context (archaeology) , domain (mathematical analysis) , content (measure theory) , condensed matter physics , crystallography , analytical chemistry (journal) , thermodynamics , physics , mathematics , chemistry , mathematical analysis , composite material , geology , paleontology , optoelectronics , quantum mechanics , dielectric , chromatography
Heterophase ferroelectric solid solutions of (1‐ x )BiScO 3 − x PbTiO 3 are studied near the morphotrpic phase boundary (0.60 ≤ x ≤ 0.64). The role of non‐180° domain types of the P 4 mm and R 3 m phases in heterophase structures is studied in the context of the phase content. It is shown that the bridging Cm phase coexists with the adjacent phase (either P 4 mm or R 3 m ), and different variants of an elastic matching ‘single‐domain Cm phase–polydomain P 4 mm phase’, ‘single‐domain Cm phase–polydomain R 3 m phase’ and ‘single‐domain Cm phase–near single‐domain R 3 m phase’ promote the complete stress relief. Based on these concepts and considering a minimum number of the domain types in the coexisting phases, we find a molar‐concentration dependence of the volume fraction of the Cm phase in the heterophase states. A correlation between the predicted volume fraction of the Cm phase and ratios of its unit‐cell parameters is first revealed. The role of the intermediate R 3 m phase in the phase sequence R 3 c − R 3 m − Pm \documentclass{article}\usepackage{amssymb}\begin{document}\pagestyle{empty}$\overline 3$\end{document} m and in the stress relief at x = 0.60 is discussed. Good agreement between the predicted and experimental data on the phase content is reached near the morphotrpic phase boundary.