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The Role of Titania in Silica Glasses
Author(s) -
TURNBULL R. C.,
LAWRENCE W. G.
Publication year - 1952
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.1151-2916.1952.tb13065.x
Subject(s) - refractive index , refraction , silica glass , mineralogy , ion , molar , materials science , series (stratigraphy) , coordination number , analytical chemistry (journal) , thermodynamics , chemistry , optics , physics , geology , composite material , paleontology , optoelectronics , organic chemistry , chromatography
A series of glasses in the system Na 2 O–SiO 2 –TiO 2 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 TiO 2 , as determined in glass, corresponds closely with the values obtained from crystalline compounds and indicates that the Ti 4+ 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.