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Aluminum Oxide Anomaly and Structure Model of Alkali Aluminosilicate Glasses

1987; Wiley; Volume: 70; Issue: 4 Linguagem: Inglês

10.1111/j.1151-2916.1987.tb04975.x

1551-2916

Akiyoshi Osaka, M. Ono, Katsuaki Takahashi,

Luminescence Properties of Advanced Materials

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.