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EPR studies of Cu2+ and V4+ ions in phosphate glasses

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Abstract

Two lead-phosphate glass systems doped with both copper and vanadium ions in different ratios were studied by EPR (electron paramagnetic resonance) method. EPR spectra and parameters (g‖ = 2.44, g⊥ = 2.08 andA ‖ = 117.6 · 10−4 cm−1) obtained for x(CuO · V2O5)(l−x)[2P2O5 · PbO] glasses withx ≤ 10 mol% suggest a tetrahedral (Td) coordination of Cu2+ ions and not a tetragonally elongated octahedron as has been assumed in previous works. The ground state of the paramagnetic electron is thed xy copper orbital with a 4pz contribution of 6%. For 20 ≤x ≤ 40 mol% a broad line (ΔB = 307 G) characteristic for clustered ions appears atg = 2.18. The V4+ ions are evidenced only in the spectra of x(CuO · 2V2O5)(1 −x)[2P2O5 · PbO] glasses and the resonance parameters suggest a pentacoordinated C4v local symmetry for these ions. The hyperfine structures characteristic for Cu2+ and V4+ ions disappear for 10 ≤x ≤ 40 mol% due to the mixed exchange Cu2+−V4+ pair formation in these glasses.

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Authors and Affiliations

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

    O. Cozar, I. Ardelean, V. Simon, L. David, N. Vedean & V. Mih

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  1. O. Cozar
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  2. I. Ardelean
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  3. V. Simon
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  4. L. David
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  5. N. Vedean
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  6. V. Mih
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Cozar, O., Ardelean, I., Simon, V. et al. EPR studies of Cu2+ and V4+ ions in phosphate glasses. Appl. Magn. Reson. 16, 473–480 (1999). https://doi.org/10.1007/BF03161943

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  • DOI: https://doi.org/10.1007/BF03161943

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