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STRUCTURAL AND MAGNETIC INVESTIGATIONS OF TRANSITION METAL IONS IN TeO2 BASED GLASSES

I. Ardelean1,* , S. Filip2

Affiliation

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

Abstract

Electron paramagnetic resonance (EPR) and magnetic susceptibility measurements are performed on xMnOm(100-x)[70TeO225B2O35PbO] glasses with MnOm Cr2O3 (0 < x £ 20 mol %), Fe2O3 (0 < x £ 20 mol %), MnO (0 < x £ 40 mol %) or CuO (0 < x £ 40 mol %). The EPR absorption spectra due to paramagnetic ions (Cr3+, Fe3+, Mn2+ and Cu2+) in vitreous matrix revealed the structural details of the diamagnetic host, the coordination, distribution and valence states of the paramagnetic ions, the EPR parameters being sensitive to the local symmetry, the character of the chemical bonds, as well as to structural factors. EPR and magnetic susceptibility data have shown that the magnetic ions are present in the glasses as isolated species, coupled by dipole-dipole and negative superexchange interactions. The strength of interaction that involves magnetic ions was determined as a function of concentration and the valence states of magnetic-active ions were revealed. The particular behaviour of the transition metal ions in the glassy matrix depends on the nature and concentration of the paramagnetic ions..

Keywords

TeO2 based glass, ESR, Magnetic susceptibility.

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

Citation

I. Ardelean, S. Filip, STRUCTURAL AND MAGNETIC INVESTIGATIONS OF TRANSITION METAL IONS IN TeO2 BASED GLASSES, Journal of Optoelectronics and Advanced Materials Vol. 5, Iss. 1, pp. 157-169 (2003)