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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 | URI: | http://scholarbank.nus.edu.sg/handle/10635/95676 | ISSN: | 00381098 |
| Appears in Collections: | Staff Publications |
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