Relation between x-ray emission mechanism and crystal structure in LiNbO3
Relation between x-ray emission mechanism and crystal structure in LiNbO3
复制标题
LiNbO3 X射线发射机理与晶体结构的关系
DOI：
10.1088/0031-8949/73/5/010
复制
发表时间：
2006
期刊：
影响因子：
2.9
通讯作者：
Sei Fukushima
中科院分区：
文献类型：
--
作者：
Y. Nakanishi;H. Mizota;Yoshiaki Ito;M. Takano;Shinji Fukao;S. Yoshikado;K. Ohyama;K. Yamada;Sei Fukushima
用一种新的晶体清洗方法，在真空系统中进行热处理，证实了LiNbO_3中的X射线发射。在297,323,373,423和473 K下进行了详细的单晶高温X射线结构修正，远低于相变温度(∼1473 K)。晶胞尺寸a和V随温度呈线性增加，而晶格参数c仅有轻微的线性增加。在423 K以下，相邻八面体中Nb-O键的长度几乎不变。这表明Nb中的价电子在化合物中发生了变化。因此，包括电子在内的带电粒子引起的x射线发射可以认为与LiNbO_3中Nb的电荷密切相关。
x-ray emission in LiNbO3 is confirmed by thermal treatments in a vacuum system by a new cleaning method of the crystal. Detailed single-crystal high-temperature x-ray structure refinements were carried out at 297, 323, 373, 423 and 473 K, far below the phase transition (∼1473 K). The unit cell dimensions a and V show a linear increase with temperature; however, the lattice parameter, c shows only a slight linear increase. The length of Nb–O bonds in adjacent octahedra is almost constant below 423 K. It is suggested that the valence electron in Nb changes in the compound. Therefore, x-ray emission induced by charged particles including electrons can be considered to have a close relation to the electric charge of Nb in LiNbO3.