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Inne
Structure and phase transitions in the ferroelastic [C(NH2) 3] 3Bi2Br9 crystal.
Autorzy
Rok wydania
1999
Czasopismo
Journal of Physics-Condensed Matter
Numer woluminu
11
Strony
4731-4746
DOI
10.1088/0953-8984/11/24/314
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
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 the monoclinic symmetry, space group P21/m. The crystal undergoes a complex sequence of phase transitions: at 311 K, 333.5 K, 350 K, 415 K and 425 K. All phase transitions were found to be of first order type. The ferroelastic domain structure is maintained from room temperature up to 425 K. The temperature measurements of the linear birefringence and optical observations suggest the tetragonal symmetry of the parent paraelastic phase above 425 K.
Adres publiczny
https://doi.org/ 10.1088/0953-8984/11/24/314
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