RADIAL DISTRIBUTION FUNCTION STUDIES OF GLASSY GERMANIUM-SILVER-CHALCOGEN ALLOYS

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Abstract
X-ray diffraction radial distribution function (rdf) studies have been performed on 15 different alloys in the glassy GexAgy X1-x-y systems, where X is S or Se. Assumption of fourfold Ge coordination and no S-S bonds in the sulfur alloys leads to direct determination of Ag coordination numbers in the range 3 to 4. The further assumption that the S and Se materials have the same near neighbor coordination numbers leads to the determination of chalcogen coordination numbers which increase with y to approximately 4. The resulting coordination numbers are, on the average, consistent with the 8-N rule. The Ag-X distances are closer to the covalent than to the ionic distances and are consistent with those in the crystalline compound Ag8GeX6

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