The role of spin-spin interaction in the electrical conductivity of vanadium phosphate glasses

L. I. Horváth, I. Geresdi, T. Szörényi

Research output: Article

7 Citations (Scopus)

Abstract

Representative glass series of different vanadium content and valence state have been studied with special emphasis on V4+-V4+ spin-spin interaction. From temperature dependent EPR studies paramagnetic Curie temperatures and J values have been determined. We demonstrate that this method is informative in the whole glass formation range. It is shown that there is an antiferromagnetic → ferromagnetic transition at c = V4+/(V4+ + V5+) ∼ 0.17 (2.3×1021 spin cm-3). At this composition the glass is essentially homogeneous and displays maximal conductivity. In glasses of higher V4+ content, in which the dominating interaction is ferromagnetic, the conductivity gradually decreases. Therefore, ferromagnetically coupled V4+ - V4+ pairs seem to contribute to conductivity less effectively.

Original languageEnglish
Pages (from-to)429-438
Number of pages10
JournalJournal of Non-Crystalline Solids
Volume70
Issue number3
DOIs
Publication statusPublished - ápr. 1985

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ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Materials Chemistry

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