Brillouin-scattering studies of ferroelectric [NH3(CH3)]5Bi2Cl11

被引：20
作者：
Mroz, B
Tuszynski, JA
Kiefte, H
Clouter, MJ
Jakubas, R
Sept, D
机构：
[1] Adam Mickiewicz Univ, Inst Phys, PL-61614 Poznan, Poland
[2] Univ Alberta, Dept Phys, Edmonton, AB T6G 2J1, Canada
[3] Mem Univ Newfoundland, Dept Phys & Phys Oceanog, St John, NF A1B 3X7, Canada
[4] Wroclaw B Beirut Univ, Fac Chem, PL-50383 Wroclaw, Poland
[5] Univ Calif San Diego, Dept Chem & Biochem, La Jolla, CA 92093 USA
来源：
PHYSICAL REVIEW B | 1998年 / 58卷 / 21期
关键词：
D O I：
10.1103/PhysRevB.58.14261
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
High-resolution Brillouin spectroscopy was used to investigate the elastic properties of [NH3(CH3)](5)Bi2Cl11. The temperature dependences of nine phonon modes propagating in the directions [100], [010], [001], [110], [101], and [011] were obtained in the temperature range from 120 to 330 K. Strong correlations were found with the electric polarization mode which exhibits anomalous behavior at 307 and 170 K. A theoretical explanation of the experimental observations was given in terms of Landau-type free energy expansion for two inequivalent sublattices. Discussion was provided regarding the possible types of couplings between strain tensor components and spontaneous polarization. [S0163-1829(98)07345-7].
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页码：14261 / 14269
页数：9
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