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Inne
Structural phase transition in a perovskite-type NH3(CH2)3NH3CuCl4 crystal : X-ray and optical studies.
Autorzy
Rok wydania
2017
Czasopismo
Numer woluminu
90
Strony
637-643
DOI
10.1080/01411594.2016.1252983
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
X-ray powder studies and optical studies (polarized microscopic observation and linear birefringence studies) of the crystal NH3(CH2)3NH3CuCl4 are presented. The X-ray powder studies revealed a change of symmetry from orthorhombic room-temperature phase to monoclinic phase above 434 K. A reversible phase transition of the first order at 434 K on heating and 432 K on cooling was observed in birefringence studies. Optical polarized microscopic observation revealed monodomain and multidomain states in the room-temperature orthorhombic phase with domain walls in (110) and (1-10) planes. The hypothetical prototypic phase is expected to be tetragonal. The change of symmetry from orthorhombic to monoclinic and expected domain structure was found above 434 K in the (010) plane.
Słowa kluczowe
Organic–inorganic compounds, phase transitions, X-ray diffractometry, linear birefringence, ferroelastic domains
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