Ferroelectric Phase Transition in CdTiO 3 Single Crystal
Ferroelectric Phase Transition in CdTiO 3 Single Crystal
复制标题
CdTiO 3 单晶中的铁电相变
DOI：
10.1080/00150190390204745
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发表时间：
2003
期刊：
影响因子：
0.8
通讯作者：
M. Itoh
中科院分区：
文献类型：
--
作者：
Y. Shan;H. Mori;Keitaro Tezuka;H. Imoto;M. Itoh
用像板技术在SPRING-8的BL02B1真空室中进行了低温单晶X射线衍射测量。在20K、70K和150K下收集强度数据，在每个温度下拍摄36张照片。在20K观察到的系统消光可概括为(Hk0)反射的h=2n+1。这一观察结果与在这个温度下的铁电性观测一起唯一地确定了空间群为P21 Ma，尽管先前的报告认为空间群为Pn2a。用这个空间群可以改进结构，得到4359次反射的R=0.056。150K时，其结构与文献报道的Pnma空间群基本相同。
Single-crystal X-ray diffraction measurements at low temperature were carried out using the image-plate technique in the vacuum chamber at BL02B1 of SPring-8. The intensity data were collected at 20 K, 70 K, and 150 K, 36 photographs being taken at each temperature. The systematic extinctions observed at 20 K could be summarized as h = 2 n + 1 for ( hk 0) reflections. This observation together with the observations of the ferroelectricity at this temperature uniquely determine the space group as P 2 1 ma though a previous report suggested the space group to be Pn 2 1 a . The structure could be refined with this space group yielding R = 0.056 for 4359 reflections. The structure of CdTiO 3 at 150 K was found to be almost identical to the previously reported one, belonging to the space group Pnma .