Tin valence and local environments in silicate glasses as determined from X-ray absorption spectroscopy

被引:10
|
作者
McKeown, David A. [1 ]
Buechele, Andrew C. [1 ]
Gan, Hao [1 ]
Pegg, Ian L. [1 ]
机构
[1] Catholic Univ Amer, Vitreous State Lab, Washington, DC 20064 USA
关键词
nuclear and chemical wastes; oxide glasses; borosilicates; X-rays; absorption;
D O I
10.1016/j.jnoncrysol.2008.01.019
中图分类号
TQ174 [陶瓷工业]; TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
X-ray absorption spectroscopy (XAS) was used to characterize the tin (Sn) environments in four borosilicate glass nuclear waste formulations, two silicate float glasses, and three potassium aluminosilicate glasses. Sn K-edge XAS data of most glasses investigated indicate Sn4+O6 units with average Sn-O distances near 2.03 angstrom. XAS data for a float glass fabricated under reducing conditions show a mixture of Sn4+O6 and Sn2+O4 sites. XAS data for three glasses indicate Sn-Sn distances ranging from 3.43 to 3.53 angstrom, that suggest Sn4+O6 units linking with each other, while the 4.96 angstrom Sn-Sn distance for one waste glass suggests clustering of unlinked Sn4+O6 units. (C) 2008 Elsevier B.V. All rights reserved.
引用
收藏
页码:3142 / 3151
页数:10
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