Structural and Mössbauer studies of nanocrystalline Mn4+-doped Li0.5Fe2.5O4 particles prepared by mechanical milling

H. M. Widatallah, F. N. Al-Mabsali, F. S. Al-Hajri, N. O. Khalifa, A. M. Gismelseed, A. D. Al-Rawas, M. Elzain, A. Yousif

Research output: Contribution to journalArticle

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Abstract

The structure and magnetic properties of spinel-related Mn4+-doped Li0.5Fe2.5O4 nanocrystalline particles of the composition Li0.5Fe2.25Mn0.1875O4, prepared by milling a pristine sample for different times, were investigated. The average crystallite and particle size, respectively, decreased form ∼40 nm to ∼10 nm and ∼2.5 μm to ∼10 nm with increasing milling time from 0 h to 70 h. Rietveld refinement of the XRD data of the non-milled sample show the Mn4+ dopant ions to substitute for Fe3+ at the octahedral B-sites of the spinel-related structure. The Mössbauer spectra of the milled ferrites indicate that more particles turn superparamagnetic with increasing milling time. The Mössbauer data collected at 78 K suggest that while in the non-milled sample the Mn4+ ions substitute for Fe3+ at the octahedral B-sites, this is reversed as milling proceeds with doped Mn4+ ions, balancing Fe3+ vacancies and possibly Li+ ions progressively migrate to the tetrahedral A-sites. This is supported by the slight increase observed in the magnetization of the milled samples relative to that of the non-milled one. The magnetic data suggest that in addition to the increasing superparamagentic component of the milled particles, thermal spin reversal and/or spin canting effects are possible at the surface layers of the nanoparticles.

Original languageEnglish
Article number50
JournalHyperfine Interactions
Volume237
Issue number1
DOIs
Publication statusPublished - Dec 1 2016

Fingerprint

Ions
spinel
ions
substitutes
Rietveld refinement
Ferrites
Crystallite size
Vacancies
ferrites
Magnetization
Magnetic properties
surface layers
Particle size
Doping (additives)
Nanoparticles
magnetic properties
nanoparticles
magnetization
Chemical analysis
spinell

Keywords

  • Defects
  • Lithium ferrites
  • Mössbauer spectroscopy
  • Nanoparticles
  • XRD

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Nuclear and High Energy Physics
  • Atomic and Molecular Physics, and Optics
  • Physical and Theoretical Chemistry

Cite this

Structural and Mössbauer studies of nanocrystalline Mn4+-doped Li0.5Fe2.5O4 particles prepared by mechanical milling. / Widatallah, H. M.; Al-Mabsali, F. N.; Al-Hajri, F. S.; Khalifa, N. O.; Gismelseed, A. M.; Al-Rawas, A. D.; Elzain, M.; Yousif, A.

In: Hyperfine Interactions, Vol. 237, No. 1, 50, 01.12.2016.

Research output: Contribution to journalArticle

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AU - Al-Hajri, F. S.

AU - Khalifa, N. O.

AU - Gismelseed, A. M.

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AB - The structure and magnetic properties of spinel-related Mn4+-doped Li0.5Fe2.5O4 nanocrystalline particles of the composition Li0.5Fe2.25Mn0.1875O4, prepared by milling a pristine sample for different times, were investigated. The average crystallite and particle size, respectively, decreased form ∼40 nm to ∼10 nm and ∼2.5 μm to ∼10 nm with increasing milling time from 0 h to 70 h. Rietveld refinement of the XRD data of the non-milled sample show the Mn4+ dopant ions to substitute for Fe3+ at the octahedral B-sites of the spinel-related structure. The Mössbauer spectra of the milled ferrites indicate that more particles turn superparamagnetic with increasing milling time. The Mössbauer data collected at 78 K suggest that while in the non-milled sample the Mn4+ ions substitute for Fe3+ at the octahedral B-sites, this is reversed as milling proceeds with doped Mn4+ ions, balancing Fe3+ vacancies and possibly Li+ ions progressively migrate to the tetrahedral A-sites. This is supported by the slight increase observed in the magnetization of the milled samples relative to that of the non-milled one. The magnetic data suggest that in addition to the increasing superparamagentic component of the milled particles, thermal spin reversal and/or spin canting effects are possible at the surface layers of the nanoparticles.

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