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

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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

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Ferrites
ferrites
Magnetic properties
magnetic properties
Magnetic variables measurement
Magnetometers
Saturation magnetization
Curie temperature
Magnetic moments
Magnetic susceptibility
Cations
Copper
Positive ions
Spectroscopy
microbalances
magnetometers
sublattices
magnetic measurement
Temperature
magnetic moments

Keywords

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

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Magnetic properties of Cu1+xMxFe2-2xO 4 mixed ferrites (M = Ge,Ti, 0≤x≤0.4). / Al-Rawas, A. D.; Rais, A.; Yousif, A. A.; Gismelseed, A. M.; Elzain, M. E.; Mazen, S.; Al-Falaky, A.

In: Journal of Magnetism and Magnetic Materials, Vol. 269, No. 2, 02.2004, p. 168-175.

Research output: Contribution to journalArticle

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abstract = "Spinnel copper ferrites Cu1+xMxFe 2-2xO4 (M = Ge, Ti) with 0≤x≤0.4 have been investigated using M{\"o}ssbauer spectroscopy and magnetic measurements. M{\"o}ssbauer 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 M{\"o}ssbauer 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 M{\"o}ssbauer analysis.",
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T1 - Magnetic properties of Cu1+xMxFe2-2xO 4 mixed ferrites (M = Ge,Ti, 0≤x≤0.4)

AU - Al-Rawas, A. D.

AU - Rais, A.

AU - Yousif, A. A.

AU - Gismelseed, A. M.

AU - Elzain, M. E.

AU - Mazen, S.

AU - Al-Falaky, A.

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N2 - 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.

AB - 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.

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