Abstract

Raman and IR spectra of the crystalline compounds α-K₃AsO₄ K₄As₂O₇, K₅As₃O₁₀, and γ-KAsO₃ are given together with tentative assignments in terms of symmetrical and antisymmetrical As—O⁻ and As—O—As bond-stretching and bond-bending vibrations. Comparison of the Raman spectra of crystalline arsenates with those of vitreous arsenates, stabilized with Al₂O₃, in the composition region KAsO₃-K₄As₂O₇ is used to deduce the molecular structure of these glasses. It appears that in the glasses chains of AsO₄ tetrahedra are present.

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