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Proceedings Paper

X-ray absorption spectroscopy study of the local environment around tungsten and molybdenum ions in tungsten-phosphate and molybdenum-phosphate glasses
Author(s): A. Kuzmin; J. Purans
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Paper Abstract

X-ray absorption spectroscopy (XAS) was used to study the local environment around tungsten and molybdenum ions in BaO-P2O5-WO3 and CaO-P2O5-MoO3 glasses having different composition of WO3 and MoO3 oxides. The W L1,3 and Mo K edges x-ray absorption spectra were measured in transmission mode at room temperature using the synchrotron radiation emitted by the ADONE and LURE DCI storage rings, respectively. The analysis of x-ray absorption near edge structure (XANES) and extended x-ray absorption fine structure (EXAFS) in glasses was performed in comparison with the results for a number of crystalline WO3, CaWO4, Na0.66WO3 alpha- MoO3, beta-MoO3 and amorphous a-WO3, a-MoO3 compounds. The results of the EXAFS modeling by two different methods [(1) multi-shell best-fit procedure within harmonic approximation and (2) model-independent radial distribution function approach] allowed us to extract detailed structural information on the first coordination shell of metal (W or Mo) ions. Using the obtained data together with the information given by XRD, EPR and optical spectroscopies, we propose the model of incorporation of W and Mo ions within the glass network.

Paper Details

Date Published: 6 February 1997
PDF: 6 pages
Proc. SPIE 2968, Optical Organic and Semiconductor Inorganic Materials, (6 February 1997); doi: 10.1117/12.266831
Show Author Affiliations
A. Kuzmin, Univ. of Latvia (Latvia)
J. Purans, Univ. of Latvia (Latvia)


Published in SPIE Proceedings Vol. 2968:
Optical Organic and Semiconductor Inorganic Materials
Edgar A. Silinsh; Arthur Medvids; Andrejs R. Lusis; Andris O. Ozols, Editor(s)

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