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Examples of domain studies of electric field or stress-induced phase transitions in the ferroic crystals of Cr₃B₇O₁₃Cl, Cd₂Nb₂O₇ and Pb(Mg₁/₃Nb₂/₃)O₃

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Published in Ferroelectrics. 1993, vol. 140, p. 319-326
Abstract Stress or electric field-induced phase transitions have been studied in single crystals of Cr-Cl boracite, Cd<sub>2</sub>Nb<sub>2</sub>O<sub>7</sub> and Pb(Mg<sub>1/3</sub>Nb<sub>2/3</sub>O<sub>3</sub> by means of polarized light microscopy associated with electric characterizations. A mm2 phase was found to be induced in Cr-Cl by spontaneous stress at the mechanically non-matching 43m/42m interface at 264 K. Application of an electric field to the 42m phase can induce a mm2 phase, as wa characterized by an antiferroelectric behaviour. In the Cd<sub>2</sub>Nb<sub>2</sub>O<sub>7</sub> crystals a field-induced phase ttransition mm2(pp)->mm2(ss)was observed. A macroscopically polar phase can be induced in PMN by E, with appearance of macrodomains, birefringent on (100)<sub>cub</sub> and (110)<sub>cub</sub> and optically isotropic on (111)<sub>cub</sub> (O.A//<111><sub>cub</sub> ). the symmetry of the induced phase was deduced to be trigonal 3m. The polarized light microscopy was shown to be a powerful tool for studying the induced phase transitions in ferroic materials.
Keywords Induced phase transitionDomainsCr₃B₇O₁₃ClCd₂Nb₂O₇Pb(Mg₁/₃Nb₂/₃)O₃
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YE, Zuo-Guang. Examples of domain studies of electric field or stress-induced phase transitions in the ferroic crystals of Cr₃B₇O₁₃Cl, Cd₂Nb₂O₇ and Pb(Mg₁/₃Nb₂/₃)O₃. In: Ferroelectrics, 1993, vol. 140, p. 319-326. https://archive-ouverte.unige.ch/unige:81200

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