Infrared spectra and structure of superionic conducting glasses in the system AgIAg2OMoO3 |
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Authors: | Tsutomu Minami Tadashi Katsuda Masami Tanaka |
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Institution: | Department of Applied Chemistry, University of Osaka Prefecture, Sakai-Shi, Osaka-Fu 591, Japan |
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Abstract: | Thin blown films of glasses with the mole ratio Ag2O/MoO3 = 1 in the system AgIAg2OMoO3 (or the pseudobinary system AgIAg2MoO4) show three absorption bands in the range 4000-200 cm?1; 875 cm?1 (w), 780 cm?1 (s), and 320 cm?1 (m, b), which are characteristic of tetrahedral MoO42? ions. The glasses with the ratio Ag2O/MoO3 < 1 have two additional bands at 600 cm?1 (w) and 450 cm?1 (vw), which are characteristic of condensed ions of MoO4 tetrahedra, probably Mo2 O72? ions. These glasses are thus composed of Ag+, I?, MoO42?, and probably Mo2O72? ions, and classified as “ionic” glasses containing one type of cations. The presence of partial covalency in the Ag+… ?OMo link and the influence of ion exchange of Ag+ with K+ on IR spectra are discussed. The molar volume of the glasses with the ratio Ag2O/MoO3 = 1 is primarily determined by a fairly dense packing of the constituent anions, I? and MoO42?. |
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