Structure of Sodium Aluminosilicate Glass Surfaces
作者:
David M. Zirl,
Stephen H. Garofalini,
期刊:
Journal of the American Ceramic Society
(WILEY Available online 1992)
卷期:
Volume 75,
issue 9
页码: 2353-2362
ISSN:0002-7820
年代: 1992
DOI:10.1111/j.1151-2916.1992.tb05585.x
出版商: Blackwell Publishing Ltd
数据来源: WILEY
摘要:
Sodium aluminosilicate (NAS) glass surfaces with compositions containing approximately 63% SiO2and Al/Na ratios,R, of 0.25R2.0 were simulated using the molecular dynamics technique with a multibody interaction potential. There were changes to the surface structure and composition in comparison to bulk NAS glasses. The changes included an increased concentration of sodium and oxygen and the formation of nonbridging oxygen at the outermost surfaces, although the increases were smaller with increased Al concentration. In addition, the formation of small‐membered rings and three‐coordinated aluminum occurred in the subsurface regions. These changes were accompanied by a change in the ratio of Al/Na in the region extending to 4 Å below the sur
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