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Structural investigation of Fe2O3-B2O3-PbO-Ag2O glass system by EPR spectroscopy

V. TIMAR1, I. ARDELEAN1,*

Affiliation

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

Abstract

Glasses of the xFe2O3·(100-x)[3B2O3·(1-y)PbO·yAg2O] systems, with 0 < x ≤ 20 mol% and y = 0.1, 0.3, 0.5 were investigated by means of electronic paramagnetic resonance (EPR) measurements. The local order in diamagnetic vitreous matrices may be revealed by the Fe3+ paramagnetic ions used in EPR experiments. Following, in each system corresponding a value of y, the effect of increasing the Fe2O3 content in the samples was investigated. The shape of the EPR spectra of Fe3+ (3d5; 5 2 6 / S ) paramagnetic ions mainly consists in resonance absorptions centered at geff ≅ 4.3 and geff ≅ 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 and magnetic interaction changes, the distribution and also different valence states of these ions in the glass matrices. The magnetic interactions between iron ions were also evidenced. The concentration range in which homogeneous glasses from studied systems are formed (0 < x ≤ 20 mol%) isn't influenced on particular values of y. When increase the Ag2O content in glasses matrices, the shape of EPR spectra is little modified. In addition, it observed a similitude concerning the way of variation from the characteristic parameters of resonance lines (J and ΔB) and also an increasing of values of these parameters at increasing of Ag2O content..

Keywords

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

Submitted at: Nov. 15, 2006
Accepted at: March 15, 2007

Citation

V. TIMAR, I. ARDELEAN, Structural investigation of Fe2O3-B2O3-PbO-Ag2O glass system by EPR spectroscopy, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 3, pp. 613-616 (2007)