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|Title:||A Raman study of the phase transition in (CH3NH3)5Bi2Cl11|
|Authors:||Kuok, M.H. |
|Source:||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|
|Appears in Collections:||Staff Publications|
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