EXAFS and Raman studies of dysprosium doped sodium sulfates
EXAFS and Raman studies of dysprosium doped sodium sulfates
复制标题
掺镝硫酸钠的 EXAFS 和拉曼研究
DOI：
10.1063/1.468014
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发表时间：
1994
影响因子：
4.4
通讯作者：
R. Linford
中科院分区：
文献类型：
--
作者：
G. Dharmasena;W. Schlindwein;R. Frech;R. Linford
给出了掺Dy~(3+)浓度为0.5%和3%的Dy~(3+)硫酸钠的拉曼光谱、电导和EXAFS研究结果。拉曼光谱研究表明，当掺杂量较低时(Dy3+的摩尔分数为0.5%)，会形成III相结构，而当掺杂量较高时(Dy3+的摩尔分数为3%)，则会转变为I相结构。电导率随掺杂量的增加而增大。EXAFS探测掺杂离子的直接局域环境的结果表明，这两个结构的最近邻壳层几乎相同，只有在次近邻壳层中可以看到细微的差异。这与影响相稳定过程的是掺杂离子的数量而不是性质的概念是一致的。EXAFS的研究还表明，没有镝的聚集。这些研究证实了拉曼和EXAFS技术的互补性，前者探测主体结构，后者研究局部掺杂离子环境。
Results of Raman, conductivity and EXAFS studies of dysprosium doped sodium sulfates at concentrations of 0.5% and 3% of Dy3+ are presented. The Raman studies show that the lower dopant level (0.5% mole of Dy3+) produces the phase III structure whereas the higher doping (3% mole of Dy3+) results in a change to the phase I form. The conductivity increases with dopant level. The EXAFS results, which probe the immediate local environment of the dopant ion, show that the nearest neighbor shells for the two structures are almost identical and only subtle differences can be seen in the second nearest neighbor shells. This is consistent with the concept that it is the number rather than nature of the dopant ion that influences the phase stabilization process. The EXAFS studies also showed the absence of dysprosium clustering. These studies confirm the complementary nature of the Raman and EXAFS techniques, the former probing the host structure and the latter addressing the local dopant ion environment.