57Fe Mössbauer and DTA study of R2O · 2FeO · V2O5 · P2O5 glasses (R = Li, Na)

Hiroshi Kurimoto, Tetsuaki Nishida, Shigeto Okada, Jun Ichi Yamaki

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Abstract

The 57Fe Mössbauer spectra of xLi 2O·2FeO·V2O5·P 2O5 and xNa2O2FeO·V2O 5·P2O5 glasses (x = 0, 0.5, 1.0 and 1.5) consist of two doublets due to FeII and FeIII. The isomer shift indicates that FeIII atoms form FeIIIO4 tetrahedra or FeIIIO6 octahedra, while FeII atoms from FeIIO6 octahedra. A liner relationship exists between the glass transition temperature, Tg, and the quadrupole splitting, Δ, of FeIII atoms in the Mössbauer spectra. Slopes of the straight lines were estimated to be 460 and 370°C (mm s -1)-1 in xLi2O·2FeO·V 2O5·P2O5 and xNa 2O·2FeO·V2O5·P 2O5 glasses, respectively. These results suggest that FeIII atoms form oxygenpolyhedra that are intermediate between FeIIIO4 tetrahedra and FeIIIO6 octahedra. The electric conductivity obtained by a dc four-probe method was of the order of 10-5 to 10-6 S cm-1

Original languageEnglish
Pages (from-to)637-640
Number of pages4
JournalJournal of the Ceramic Society of Japan
Volume116
Issue number1353
DOIs
Publication statusPublished - May 2008

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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