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Dissolution of SO3 within a lithium phosphate glass network and structure–property relationships

AuthorsHémono, Nicolas ; Muñoz, Francisco
Issue Date2010
PublisherSociety of Glass Technology
CitationPhysics and Chemistry of Glasses: European Journal of Glass Science and Technology Part B Volume 51 Number 2 April 2010
AbstractThe relationship between the structure and properties of glasses with composition 50Li2O.xSO3.(50−x)P2O5 (x=10–30, mol%) has been studied. SO3 can be dissolved into lithium phosphate glasses up to at least 20 mol%, while for glasses containing as much as 30 mol% SO3 it is present as crystalline Li2SO4, as seen by XRD and TEM. 31P NMR experiments have shown no bonds of the type P–O–S, thus it is thought that Li2SO4 can be homogeneously dissolved within the lithium phosphate glass matrix without direct bonding between phosphate groups and SO4 2− ions. Lithium sulphate enriched regions then become saturated and precipitation of lithium sulphate crystals results. The substitution of P2O5 by SO3 lowers the glass transition temperature and molar volume while increasing the electrical conductivity of the glasses.
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