Abstract
Superionic conducting glass of the mole percent 60% Ag I-20% Ag 2 O-20% MoO 3 was prepared by rapid quenching from the melt. EXAFS and X-ray RDF studies indicate the presence of strong Ag-I interactions with r Ag-I =2.87 Å. Two Ag-O interactions whose distances differ by 0.38 Å are also indicated. X-Ray RDF studies also yield r Mo-O =2.1 Å and the coordination number of oxygen around Mo, n Mo-O =5.7. A model is proposed which consists of a three dimensional network of distorted MoO 6 octahedra, which are 6, 4, and 2-corner shared leading to large channels in the structure. The Ag + ions form bonds and secondary interactions with both non-bridging and bridging oxygen atoms in the network. The I - ions surround the Ag + ions in the voids created by the glass network. The results show that Ag + and I - ions are highly dispersed in the glass network and cluster formation was not found as proposed by earlier workers.
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