Structural rationalization of the microhardness trends of rare-earth aluminosilicate glasses: Interplay between the RE3+ field-strength and the aluminum coordinations
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
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.
RE2O3-Al2O3-SiO2 glass, Microhardness, Aluminum coordinations, Structure-property relationships, Oxynitride glass
IdentifiersURN: urn:nbn:se:su:diva-98094DOI: 10.1016/j.jnoncrysol.2013.06.013ISI: 000327279800026OAI: oai:DiVA.org:su-98094DiVA: diva2:682311
FunderSwedish Research Council, VR-NT 2009-7551Swedish Research Council, 2010-4943