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Title: A Raman study of the phase transition in (CH3NH3)5Bi2Cl11
Authors: Kuok, M.H. 
Ng, S.C. 
Iwata, M.
Ishibashi, Y.
Issue Date: Apr-1993
Citation: Kuok, M.H.,Ng, S.C.,Iwata, M.,Ishibashi, Y. (1993-04). A Raman study of the phase transition in (CH3NH3)5Bi2Cl11. Solid State Communications 86 (3) : 151-154. ScholarBank@NUS Repository.
Abstract: Low-frequency (≤ 350 cm-1) Raman spectra of (CH3NH3)5Bi2Cl11 single crystals have been studied as a function of temperature between 60 and 330 K. The temperature behaviour of the stretching mode frequencies of the (Bi2Cl11)5- anion shows that a second-order ferroparaelectric phase transition occurs at about 305 K. The transition is not accompanied by any mode softening, thus indicating its order-disorder nature. Ordering of the methylammonium cation below TC exerts a strong influence on the (Bi2Cl11)5- anion. No evidence of the ferroferroelectric phase transition, which was reported1 to occur at 170 K, was found. © 1993.
Source Title: Solid State Communications
ISSN: 00381098
Appears in Collections:Staff Publications

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