Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7903530 | Journal of Non-Crystalline Solids | 2013 | 5 Pages |
Abstract
Many studies have sought to rationalize property/structure relationships in rare-earth (RE) bearing aluminosilicate oxide or oxynitride glasses. In a set of 48 RE2O3-Al2O3-SiO2 (REÂ =Â La, Y, Lu, Sc) glasses of widely spanning compositions and RE3Â + cation field-strengths (CFS), we observe strong correlations between the microhardness, glass compactness, and the average coordination number of Al. We argue that the well-known microhardness elevation for increasing RE3Â + CFS stems not primarily from the RE3Â + ions themselves, as hitherto believed, but merely from a structure-strengthening by AlO5/AlO6 polyhedra that cross-link different glass-network segments. The high-coordination Al populations grow together with the RE3Â + CFS.
Related Topics
Physical Sciences and Engineering
Materials Science
Ceramics and Composites
Authors
Baltzar Stevensson, Mattias Edén,