期刊
OPTICAL MATERIALS
卷 30, 期 5, 页码 699-702出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optmat.2007.02.013
关键词
rare-earth metals; CGGO glass; short-range order; XAFS
The extended X-ray absorption fine structure (EXAFS) at L-3 edges of rare-earth atoms in glass of 3CaO-Ga2O3-3GeO(2) (or Ca3Ga2-Ge3O12) composition doped with Eu, Ho (0.7 wt.%) and Er (1.46 wt.%) has been investigated. The obtained structural parameters of the Eu, Ho and Er first (oxygen) coordination shell have shown that the local neighbourhood is independent on the kind of rare-earth ions' impurity and, taking into account structural disorder, is similar to that present in pure oxide systems. Short-range structures around the considered luminescence centres are discussed and compared with relevant literature data. (c) 2007 Elsevier B.V. All rights reserved.
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