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Title: Brillouin and ultrasonic studies of the ferroelastic phase transition in [N(CH3)4]2ZnBr4
Authors: Kuok, M.H. 
Ng, S.C. 
Liu, T.
Rang, Z.
Iwata, M.
Ishihashi, Y.
Keywords: Brillouin scattering
Elastic constant
Phase transition
Tetramethylammonium tetrabromozincate
Issue Date: May-1999
Citation: Kuok, M.H.,Ng, S.C.,Liu, T.,Rang, Z.,Iwata, M.,Ishihashi, Y. (1999-05). Brillouin and ultrasonic studies of the ferroelastic phase transition in [N(CH3)4]2ZnBr4. Journal of the Physical Society of Japan 68 (5) : 1598-1601. ScholarBank@NUS Repository.
Abstract: The temperature dependence of the elastic stiffness constant c55 in [N(CH3)4]2ZnBr4 single crystals has been measured using Brillouin scattering and the ultrasonic pulse echo overlap technique. The elastic constant c55 was found to soften strongly in both the paraelastic and ferroelastic phases. Despite the ferroelastic transition being an order-disorder type, no elastic dispersion was observed in the frequency range below ∼2 GHz. Hence the frequency of the susceptibility of the order parameter, inducing this transition, is expected to be above ∼2 GHz.
Source Title: Journal of the Physical Society of Japan
ISSN: 00319015
Appears in Collections:Staff Publications

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