Structure and phase transitions in the ferroelastic [C(NH2)3]3Bi2Br9 crystal
作者： R Jakubas , J Zaleski , B Kosturek , G Bator
DOI: 10.1088/0953-8984/11/24/314
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摘要: Differential scanning calorimetry, dilatometric, dielectric and linear birefringence measurements have been used to study the ferroelastic [C(NH2)3]3Bi2Br9 crystal. The x-ray studies showed that it crystallizes at room temperature in monoclinic symmetry, space group P21/m. crystal undergoes a complex sequence of phase transitions: 311 K, 333.5 350 415 K 425 K. All transitions were found be first order type. domain structure is maintained from up optical observations suggest tetragonal symmetry parent paraelastic above
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