Brillouin and dielectric studies of the phase transition in the relaxor ferroelectric Pb(Ni1/3Nb2/3)O3
Brillouin and dielectric studies of the phase transition in the relaxor ferroelectric Pb(Ni1/3Nb2/3)O3
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DOI：
10.1063/1.1433183
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发表时间：
2002-02-15
影响因子：
3.2
通讯作者：
Ishibashi, Y
中科院分区：
文献类型：
--
作者：
Fan, HJ;Kuok, MH;Ishibashi, Y
在80~450K温度范围内，对弛豫铁电体Pb(Ni1/3Nb2/3)O-3(PNN)进行了布里渊散射。在200K附近观察到了从顺电到铁电的弥散相变，伴随着宽的声子频率下降和最大阻尼值。基于修正的超顺电体模型，观察到并分析了宽瑞利翼形式的弛豫模，其频率在190K以上与温度有很强的相关性。PNN的介电研究也在几个测量频率下进行。根据修正的Vogel-Fulcher模型分析了测量频率与介电最高温度的关系。(C)2002年美国物理研究所。
Brillouin scattering has been performed on the relaxor ferroelectric Pb(Ni1/3Nb2/3)O-3 (PNN) from 80 to 450 K across its Curie temperature. A diffuse phase transition from the paraelectric to ferroelectric phase, associated with a broad phonon frequency dip and a damping maximum, is observed around 200 K. A relaxation mode in the form of a broad Rayleigh wing, whose frequency is strongly temperature dependent above 190 K, is observed and analyzed based on a modified superparaelectric model. Dielectric studies of PNN have also been carried out at several measurement frequencies. The relation between the measurement frequency and the dielectric maximum temperature was analyzed on a modified Vogel-Fulcher model. (C) 2002 American Institute of Physics.