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

来源：

JOURNAL OF NON-CRYSTALLINE SOLIDS | 2008年 / 354卷 / 27期

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

页码：3142 / 3151

页数：10

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