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Structural study of rubidium and caesium silicate glasses by Raman spectroscopy

Rubidium and caesium silicate glasses with high alkali content were studied by Raman spectroscopy. The relative concentration of Q n species as a function of composition have been calculated from the deconvoluted high frequency region of the Raman spectra. The equilibrium constants for reaction (2Q 3 ↔Q 4 +Q 2 ) in rubidium and caesium silicate glasses were determined It is shown that increasing the ionic radius of the alkali cations (Na<K<Rb<Cs) shifts the equilibrium of disproportionation reaction to the left.