Soft-mode behavior in lanthanide-modifiedbismuth titanates
Soft-mode behavior in lanthanide-modifiedbismuth titanates
复制标题
镧系元素改性钛酸铋的软模行为
DOI：
10.1080/00150193.2017.1355163
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发表时间：
2017
期刊：
影响因子：
0.8
通讯作者：
and Makoto Iwata
中科院分区：
文献类型：
--
作者：
Shunsuke Suzuki;Toru Mogami;Shota Nakamura;Yuhji Tsujimi;and Makoto Iwata
在Bi_（4-x）Gd_xTi_3 O_（12）（x= 0，0.1，0.28和0.36）和Bi_（4-x）La_xTi_3 O_（12）（x= 0，0.17和0.31）单晶中进行了180°拉曼散射实验。已知x = 0的材料在TH和TL（<TH）处经历连续的相变。发现软模只出现在所有晶体的下面。我们确认这种软模是X2+反铁磁畸变软模。提出了Bi/R_1和O_3沿着准正交b轴的键强度决定了在TL处发生相变的动力学机制的假设。
The 180° Raman scattering experiment has been performed in Bi4-xGdxTi3O12(x= 0, 0.1, 0.28, and 0.36) and Bi4-xLaxTi3O12(x= 0, 0.17, and 0.31) single crystals. The materials ofx≠ 0 are known to undergo successive phase transitions atTHandTL(<TH). The soft-mode is found to appear only belowTLin all crystals. We confirm that this soft-mode is the X2+antiferrodistortive soft-mode. We set up the hypothesis that the dynamic mechanism of the phase transition occurring atTLis governed by the bond strength between the Bi/R1 and O3 along the pseudo-orthorhombicb-axis.