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IR and EPR investigations of V2O5–P2O5–CaF2 glass system

N. VEDEANU1,* , O. COZAR1, I. ARDELEAN1

Affiliation

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

Abstract

IR and EPR investigations were performed on xV2O5(100-x)[P2O5·CaF2] glass system with 0.5≤x≤40mol%. IR spectra of the studied glasses pointed out the depolymerization process induced by the addition of V2O5 content because for x > 20 mo% the significant reduction of the bonding force between P and O atoms leads to the appearance of more non-bridging oxygen ions that are involved in new V-O bonds. The changes observed in the EPR spectra of these glasses are explained supposing the superposition of two EPR signals, one with a well-resolved hyperfine sructure typical for isolated V4+ ions and the other one consisting in a broad line without hyperfine sructure characteristic for clustered ions. The dependence of the linewidth versus V2O5 content has shown that until x= 5mol% these ions are coupled by dipole-dipole interaction and at high content of vanadium oxide (x > 5 mol%) the superexchange interaction prevail between them..

Keywords

V2O5-P2O5-CaF2 glass, IR, ESR.

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

Citation

N. VEDEANU, O. COZAR, I. ARDELEAN, IR and EPR investigations of V2O5–P2O5–CaF2 glass system, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 3, pp. 698-701 (2007)