The local structure and interactions between V4+ ions in soda-phosphate glasses |
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Authors: | O. Cozar I. Ardelean V. Simon L. David V. Mih N. Vedean |
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Affiliation: | (1) Faculty of Physics, Babes-Bolyai University, 400084 Cluj, Napoca, Romania;(2) Departament of Physics, North University, 430083 Baia Mare, Romania |
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Abstract: | EPR investigation on xV2O5 · (100 −x)[2P2O5 · Na2O] and xV2O5 · (100 −x)[P2O5 · mNa2O] (m = 1.5 and 2) glass systems was performed. The changes observed in the EPR spectra of xV2O5× (100 −x)[2P2O5 · Na2O] glasses with increasing content of vanadium oxide are explained supposing that these spectra consist of two superposed EPR signals, one with hyperfine structure typical for isolated ions and another one consisting of a broad line without hyperfine structure characteristic for clustered ions. The clustered V4+ ions are not evidenced at low V2O5 contents (x = 5 mol%). The EPR spectra of xV2O5 · (100 −x)[P2O5 · mNa2O] glasses indicate a superposition of two or three hyperfine structures attributed to nonequivalent VO2+ centers. Spin Hamiltonian parameters (g, A), dipolar hyperfine coupling parameter (P) and Fermi contact interaction term (K) have been evaluated. The ratio between the number of clustered and isolated ions was also determined. |
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