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Spectroscopic investigation of some lead – phosphate glasses with tungsten and molybdenum ions

O. COZAR1,* , D. A. MAGDAS1, I. ARDELEAN1

Affiliation

  1. Faculty of Physics, Babes-Bolyai University, 400084 Cluj-Napoca, Romania

Abstract

The structure of xWO3·(100-x)[2P2O5·PbO] and xMoO3·(100-x)[2P2O5·PbO] glass systems with 0≤x≤50 mol% is investigated by IR, Raman and EPR spectroscopy. The characteristic absorption bands of these glasses due to the stretching and bending vibrations are identified and analyzed by the increasing of molybdenum and tungsten oxides content. These allowed us to identify the specific structural units which appear in these glasses and thus to point out the network modifier role for low concentrations and the former role at high concentrations of the tungsten and molybdenum oxides. EPR data show also that for x ≤ 10 mol% the isolated Mo5+ and W5+ ions prevail in a square – pyramidal form (C4v) and rhombic symmetry respectively. At high MoO3 content (x > 20 mol%) the dipole – dipole and superexchange coupled Mo5+ ions appear. This fact does not occur in case of W5+ ions because of their small number..

Keywords

Lead-phosphate glass with W, Mo, EPR, IR, Raman spectroscopy.

Submitted at: Nov. 14, 2006
Accepted at: June 15, 2007

Citation

O. COZAR, D. A. MAGDAS, I. ARDELEAN, Spectroscopic investigation of some lead – phosphate glasses with tungsten and molybdenum ions, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 6, pp. 1730-1735 (2007)