Abstract
Calcium silicate and aluminosilicate glasses with various SiO2 contents (10–76mol%) were prepared in the wide range of [Al2O3]/[CaO] molar ratio from 0.10 to 4.00 by conventional melt-quenching method and an aerodynamic levitation device for a part of peraluminus glasses. Variations of glass transition temperature, the coefficient of linear expansion, and ionic packing factor derived from density measurements with [Al2O3]/[CaO] molar ratio were studied. The glass structures of SiO4 three dimensional network, mixed anions of (Si, Al)O4 tetrahedra, isolated AlO4 and Al–O–Al linkages were evaluated by FT-IR measurements. Compositional dependences of the properties are qualitatively related to the glass structure examined by IR spectroscopy and the proportions of AlOx (x=4, 5, 6) species evaluated in a previous study by using 27Al MQ NMR spectroscopy.
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