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Aluminum Oxide Anomaly and Structure Model of Alkali Aluminosilicate Glasses
Author(s) -
OSAKA AKIYOSHI,
ONO MASAYUKI,
TAKAHASHI KATSUAKI
Publication year - 1987
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1987.tb04975.x
Subject(s) - aluminosilicate , alkali metal , mineralogy , aluminium , vickers hardness test , range (aeronautics) , materials science , aluminium oxide , analytical chemistry (journal) , inorganic chemistry , chemistry , metallurgy , microstructure , composite material , catalysis , organic chemistry
The molar volume, Vickers hardness number, and optical basicity A(Pb 2+ /CaO = 1) were measured for alkali aluminosilicate glasses of composition (1 −χ)R 2 O ·χAl 2 O 3 · n SiO 2 in the range 0.2 < χ < 0.7 (0.25 < Al/R < 2.33). On the basis of their composition dependences, the constitution of the glasses is discussed in terms of the formation of [RalO 4/2 ] units in the range Al/R < 1 and that of triclusters of AlO 4 and SiO 4 units in the range Al/R > 1. The possibility of the presence of a small amount of the tricluster is proposed in the range Al/R < 1.