Structural and magnetic properties of sodium iron germanate glasses

A. Mekki, D. Holland*, Kh A. Ziq, C. F. McConville

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

35 Scopus citations

Abstract

A series of sodium iron germanate glasses, with general composition 0.3Na2O-xFe2O3-(0.7 - x)GeO2 (0 ≤ x ≤ 0.15), has been prepared by conventional melting and casting. The chemical states of the various elemental components have been investigated by X-ray photoelectron spectroscopy (XPS) from fracture surfaces produced in situ. The analysis of the Fe 3p core level spectra of the glasses which contain iron oxide revealed the presence of both Fe2+ and Fe3+ oxidation states, with the proportion of the Fe3+ ions found to increase with increasing Fe2O3 content. The O 1s spectra also show composition-dependent changes, with the fraction of non-bridging oxygen atoms also increasing with iron oxide content. Direct current magnetic susceptibility and magnetisation (M) vs magnetic field (H) measurements were also performed on the same samples. The magnetic data support the conclusion that the exchange interaction is antiferromagnetic and increases with increasing Fe2O3 content. The fraction of Fe2+ ions determined from XPS was found to be in good agreement with values obtained from fitting the M vs H data with a standard Brillouin function.

Original languageEnglish
Pages (from-to)179-190
Number of pages12
JournalJournal of Non-Crystalline Solids
Volume272
Issue number2-3
DOIs
StatePublished - Aug 2000

Bibliographical note

Funding Information:
Two of the authors (A.M. and Kh.A.Z.) would like to acknowledge the support of King Fahd University of Petroleum and Minerals, Saudi Arabia.

ASJC Scopus subject areas

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

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