Abstract: Raman spectra have been measured on bulk GeO2 glass and the alkali germanate glasses of composition M2OxGeO2 where M=K, Na, Li, and x varies from 19 to 1, as well as on crystallized glasses. The low alkali content glasses (x≥3) retain a completely polymerized structure of germania polyhedra. Addition of small amounts of alkali oxide to GeO2 glass does not break the Ge-O-Ge bridging bonds and creates higher co-ordination of germanium atoms. Further addition of alkali oxide eventually breaks up some of the Ge-O-Ge bonds to create Ge-O− non-br...
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Topics: 
Crystallography