DIRECT OBSERVATIONS OF THE DOPANT ENVIRONMENT IN FLUORITES USING EXAFS
DIRECT OBSERVATIONS OF THE DOPANT ENVIRONMENT IN FLUORITES USING EXAFS
复制标题
DOI：
10.1038/312601a0
复制
发表时间：
1984-01-01
期刊：
影响因子：
64.8
通讯作者：
MORONEY, LM
中科院分区：
文献类型：
--
作者：
CATLOW, CRA;CHADWICK, AV;MORONEY, LM
与重要的UO2相一样，氟化钙(CaF2)是一种缺陷体系，它的结构中可以容纳大量的三价稀土掺杂，而不会损失结构的完整性。利用扩展X射线吸收精细结构(EXAFS)，我们观察到了杂质的局域结构环境随稀土离子尺寸的变化，并通过计算机晶格模拟研究，可以区分轻掺杂和重掺杂的二聚体和六聚体组态。
Calcium fluoride (CaF2), like the important UO2phase, is a defect system having the remarkable property that large concentrations of trivalent rare-earth dopants can be accommodated within its structure with no loss of structural integrity. Using extended X-ray absorption fine structure (EXAFS), we have observed the way in which the local structural environment of the impurity alters with the size of the rare-earth ion and can distinguish, by computer lattice simulation studies, between dimer and hexamer configurations for light and heavy dopants, respectively.