Soft Mode of SrTi18O3x16O3(1-x) Studied by Raman Scattering
Soft Mode of SrTi18O3x16O3(1-x) Studied by Raman Scattering
复制标题
拉曼散射研究SrTi18O3x16O3(1-x)的软模式
DOI：
10.1143/jpsj.71.1254
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发表时间：
2002
影响因子：
1.7
通讯作者：
T. Yagi
中科院分区：
文献类型：
--
作者：
M. Kasahara;Ruiping Wang;M. Itoh;T. Yagi
对x =0.21，0.47和0.99的SrTi 18 O3 x16 O3（1- x）铁电微区进行了详细的研究.通过对铁磁共振谱的分析，发现顺电相中存在软模，尽管目前的研究还不能揭示其频率是否精确地达到零。当x =0.21时，FMR的尺寸变得比其他物种的大。这一结果意味着铁电磁共振的发展不会引起铁电相变。结果表明，SrTiO 3的同位素诱导相变是位移型相变.
A detailed study of ferroelectric microregions (FMRs) of SrTi 18 O 3 x 16 O 3(1- x ) was carried out for x =0.21, 0.47 and 0.99. From the analysis of FMR spectra, the soft mode was found in the paraelectric phase even though the present study could not reveal whether its frequency reaches exactly zero or not. The size of an FMR with x =0.21 becomes larger than those of other species. This result implies that the development of FMRs does not cause the ferroelectric phase transition. It is concluded that the phase transition induced isotopically in SrTiO 3 is of the displacive type.