Abstract
Glass forming region in the system Li2O-B2O3-GeO2 was determined. Glasses in three series, xLi2O⋅B2O3⋅2GeO2, xLi2O⋅B2O3⋅GeO2 and Li2O⋅xB2O3⋅(3-x)GeO2 were prepared. Measurements of density, refractive index, thermal expansion and Vickers microhardness have been made with these glasses. Infra-red absorption spectra of Li2O⋅B2O3⋅2GeO2 crystal and glass were also studied.Rules for the structure of alkali-boro-germanate glass were proposed. The rules are as follows:(1) BO4 groups are formed in preference to GeO6 groups.(2) Following bonds cannot occur, BO4-BO4, GeO6-GeO6 and BO4-GeO6.(3) Non bridging oxygen ions cannot belong to BO4 and GeO6 groups.To verify these rules, the relation between properties and structure of lithium-boro-germanate glasses studied was discussed.It was found that the predictions of these rules were best accord with the observed trend of properties with composition in these series of glasses except for thermal expansion coefficient, which obeyed to Abe's theory.
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