Broadband inelastic light scattering of a relaxor ferroelectric 0.71Pb(Ni1/3Nb2/3)O3-0.29PbTiO3
Broadband inelastic light scattering of a relaxor ferroelectric 0.71Pb(Ni1/3Nb2/3)O3-0.29PbTiO3
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DOI：
10.1063/1.2393159
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发表时间：
2006-11
影响因子：
4
通讯作者：
S. Tsukada;Y. Ike;J. Kano;T. Sekiya;Y. Shimojo;Ruiping Wang;S. Kojima
中科院分区：
文献类型：
--
作者：
S. Tsukada;Y. Ike;J. Kano;T. Sekiya;Y. Shimojo;Ruiping Wang;S. Kojima
测量了 0.71Pb(Ni1∕3Nb2∕3)O3-0.29PbTiO3 单晶的布里渊和拉曼散射，以研究宽带非弹性光谱。分别观察到与快速和慢速弛豫过程相关的两个不同的中心峰。这两个过程归因于极性纳米区域中极化的热激活切换。通过修正超顺电模型的分析，确定快弛豫过程和慢弛豫过程的活化能分别为3.66×103和4.31×102K。具有较低活化能的快速过程可能源自 180° 转换，而具有较高能量的缓慢过程则来自非 180° 转换。
Brillouin and Raman scatterings of a 0.71Pb(Ni1∕3Nb2∕3)O3-0.29PbTiO3 single crystal have been measured to investigate broadband inelastic spectra. The two different central peaks related to fast and slow relaxation processes have been observed separately. These two processes are attributed to the thermally activated switching of polarization in polar nanoregions. By the analysis of modified superparaelectric model, the activation energies of fast and slow relaxation processes are determined to be 3.66×103 and 4.31×102K, respectively. The fast process with the lower activation energy probably originated from 180° switching, whereas the slow one with the higher energy from non-180° switching.