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Structural rationalization of the microhardness trends of rare-earth aluminosilicate glasses: Interplay between the RE3+ field-strength and the aluminum coordinations
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
Stockholm University, Faculty of Science, Department of Materials and Environmental Chemistry (MMK).
2013 (English)In: Journal of Non-Crystalline Solids, ISSN 0022-3093, E-ISSN 1873-4812, Vol. 378, 163-167 p.Article in journal (Refereed) Published
Abstract [en]

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 (RE = La, Y, Lu, Sc) glasses of widely spanning compositions and RE3+ 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 RE3+ CFS stems not primarily from the RE3+ 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 RE3+ CFS.

Place, publisher, year, edition, pages
2013. Vol. 378, 163-167 p.
Keyword [en]
RE2O3-Al2O3-SiO2 glass, Microhardness, Aluminum coordinations, Structure-property relationships, Oxynitride glass
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:su:diva-98094DOI: 10.1016/j.jnoncrysol.2013.06.013ISI: 000327279800026OAI: oai:DiVA.org:su-98094DiVA: diva2:682311
Funder
Swedish Research Council, VR-NT 2009-7551Swedish Research Council, 2010-4943
Note

AuthorCount:2;

Available from: 2013-12-27 Created: 2013-12-27 Last updated: 2017-12-06Bibliographically approved

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