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EPR investigation of Fe2O3-B2O3-PbO-Ag2O glass system

I. ARDELEAN1,* , V. TIMAR1

Affiliation

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

Abstract

Glasses of the xFe2O3·(100-x)[3B2O3·0.5PbO·0.5Ag2O] system, with 0 < x ≤ 20 mol%, were investigated by means of EPR measurements. Started from the xFe2O3·(100-x)[3B2O3·PbO] vitreous system, the effect of the partial substitution of PbO by Ag2O as a glass matrix modifier was investigated. Diminishing the concentration range in which the homogeneous glasses are formed, from 0 ≤ x ≤ 50 mol% (in the case of Fe2O3-B2O3-PbO system) at 0 ≤ x ≤ 20 mol% (in the case of Fe2O3-B2O3- PbO-Ag2O system) confirm the crystallized agent status for Ag2O. The EPR spectra structure of Fe3+ ions mainly consists in absorption resonance centered at g ≈ 4.3 and g ≈ 2.0, their prevalence depending on the Fe2O3 content. The increasing of iron content in the samples generates the EPR absorption spectra modification, reflecting structural changes, the distribution and also different valence states of iron ions in the glass matrix. The magnetic interactions between iron ions were investigated..

Keywords

Silver-lead-borate glasses, Iron ions, Local structure, EPR.

Submitted at: Nov. 2, 2006
Accepted at: April 15, 2007

Citation

I. ARDELEAN, V. TIMAR, EPR investigation of Fe2O3-B2O3-PbO-Ag2O glass system, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 4, pp. 840-843 (2007)