Recent Raman spectra of Matson, Sharma, and Philpotts on g-xM₂O{·}(100-x)SiO₂ for M=all alkalies and x=5n, n=1,...,6, are analyzed theoretically. The selective enhancement of certain bands by alkali addition is explained naturally by alkali intercalation along cluster internal surfaces, but is incompatible with monolithic continuous-random-network models.
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J. C. Phillips (1985) studied this question.
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