Abstract
A series of glasses in the system Na2O–SiO2–TiO2 were melted. Density measurements and refractive indices were determined. Molar refractions of the various glasses were calculated using the Lorentz‐Lorenz relationship. The partial molar refraction of TiO2, as determined in glass, corresponds closely with the values obtained from crystalline compounds and indicates that the Ti4+ ion exists in sixfold coordination. Interionic distances were calculated using the Kordes equation, the calculated Si–O distance being 1.60 a.u. and the Ti–O distance, equal to 2.01 a.u.
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