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STRUCTURAL AND MAGNETIC INVESTIGATIONS OF MANGANESE IONS IN 2B2O3As2O3 GLASS MATRIX

I. Ardelean1,* , M. Flora1

Affiliation

  1. Faculty of Physics, Babes-Bolyai University, 3400 Cluj-Napoca, Romania Department of Physics, University of Oradea, 3700 Oradea, Romania

Abstract

Glasses of the xMnO(100-x)[2B2O3As2O3] system with 0 < x  50 mol % were investigated by means of electron paramagnetic resonance (EPR) and magnetic susceptibility measurements,. EPR of Mn2+ ions revealed their distribution on different structural units of 2B2O3As2O3 glass matrix doped with MnO. Distorted octahedral sites were detected. The progressive clustering of Mn2+ ions was evidenced for x  5 mol %. Magnetic data revealed both 2+ and 3+ valence states for the manganese ions simultaneously present in the vitreous matrix for x > 1 mol %. The transition from isolated ions (x < 1 mol %) to those involved in dipole-dipole interactions (x < 5 mol %) and to antiferromagnetically coupled pairs (x  5 mol %) was revealed..

Keywords

B2O3-As2O3 glass, ESR, Magnetic susceptibility.

Submitted at: July 22, 2002
Accepted at: March 12, 2003

Citation

I. Ardelean, M. Flora, STRUCTURAL AND MAGNETIC INVESTIGATIONS OF MANGANESE IONS IN 2B2O3As2O3 GLASS MATRIX, Journal of Optoelectronics and Advanced Materials Vol. 5, Iss. 1, pp. 171-175 (2003)