Abstract
A structural study of semiconducting and superionic conducting silver vanadate glasses, containing 40 mol% Agl and 1 mol %57Fe2O3, is performed by means of Mössbauer spectroscopy. Distinct composition dependency of Mössbauer parameters (Δ and Γ) of Fe3+ ions, having a minimum when Ag2O content is 30 mol %, suggests that increasing Ag2O content results in a gradual change of the glass matrix from a two-dimensional layer structure composed of VO5 tetragonal pyramids to a chain structure composed of VO4 tetrahedra. An increase in the Mössbauer parameters observed when the Ag2O content is higher than 30 mol %, corresponding to a metavanadate structure (Ag2O/V2O5=1), indicates a reverse change of the glass matrix into a complicated two- or three-dimensional network structure composed of VO4 tetrahedra. These conclusions are in good agreement with those obtained from a distinct composition dependency of glass transition temperatures (T g). Composition dependency of electrical conductivity at room temperature suggests that the structural change of glass matrix primarily affects the semiconductivity caused by a step-by-step electron hopping from V4+ to V5+ ions.
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Nishida, T., Ide, H., Takashima, Y. et al. Structural study of semiconducting and superionic conducting silver vanadate glasses. J Mater Sci 24, 1687–1692 (1989). https://doi.org/10.1007/BF01105692
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DOI: https://doi.org/10.1007/BF01105692