A Structural Study on AgI-Ag2O-CrO3 Glass

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  • A Structural Study on AgI–Ag<SUB>2</SUB>O–CrO<SUB>3</SUB> Glass
  • Structural Study on AgI Ag2O CrO3 Glass

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A structural investigation for a 50AgI–20Ag2O–30CrO3 (in mole %) glass has been carried out by using X-ray diffraction (XRD) and the extended X-ray absorption fine structure (EXAFS) techniques. The analysis of the EXAFS spectrum of the glass at the Ag K-edge reveals that the distance between a silver (I) and an iodide ions, rAg–I, and the average number of iodide ions around an Ag+, nAg–I, are 2.874(4) Å and 1.6(1), respectively. Two Ag–O distances separated by only 0.38 Å (ΔrAg–I) are deconvoluted from the total Ag–O peak in the spectrum. The results by the X-ray diffraction measurement coincide with those by the EXAFS study within experimental uncertainties: rAg–I=2.860(1) Å, nAg–I=1.34(1), and ΔrAg–I=0.35 Å. The intramolecular structural parameters of CrO3 are determined to be rCr–O=1.718 Å, and nCr–O=5.58. Short range ordering of atoms is discussed on the basis of the radial distribution function (RDF).

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