Magnetic properties of Cu1+xMxFe2-2xO 4 mixed ferrites (M = Ge,Ti, 0≤x≤0.4)

A. D. Al-Rawas, A. Rais, A. A. Yousif, A. M. Gismelseed, M. E. Elzain, S. Mazen, A. Al-Falaky

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Spinnel copper ferrites Cu1+xMxFe 2-2xO4 (M = Ge, Ti) with 0≤x≤0.4 have been investigated using Mössbauer spectroscopy and magnetic measurements. Mössbauer measurements performed at 77 and 300K show broadened magnetic sextets superimposed on a paramagnetic doublet. The magnetic components have been assigned to Fe3+ in two non-equivalent crystallographic tetrahedral and octahedral sites. The Mössbauer data show that Ge 4+ has strong preference to occupy the tetrahedral site in contrast to Ti4+ which occupy the octahedral site. Saturation magnetization (MS) measurements were performed using a vibrating sample magnetometer in the temperature range of 77-750K, while magnetic susceptibility (χm) measurements were performed using a Faraday microbalance susceptometer in the range of 500-1000K. Both MS and χ m variations with temperature indicate that the Curie temperature TC decreases almost linearly with increasing Ti and Ge concentrations. The magnetic moments calculated from the MS data and the effective paramagnetic moments calculated from χm data are discussed on the basis of Neel's two sublattice molecular field model and the cations distribution obtained from the Mössbauer analysis.

Original languageEnglish
Pages (from-to)168-175
Number of pages8
JournalJournal of Magnetism and Magnetic Materials
Volume269
Issue number2
DOIs
Publication statusPublished - Feb 2004

Keywords

  • Cations distribution
  • Copper ferrites
  • Magnetic susceptibility
  • Magnetization
  • Spinnel

ASJC Scopus subject areas

  • Condensed Matter Physics

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