Magnetic and Mössbauer studies of pure and Ti-doped YFeO 3 nanocrystalline particles prepared by mechanical milling and subsequent sintering

N. O. Khalifa, H. M. Widatallah, A. M. Gismelseed, F. N. Al-Mabsali, R. G. S. Sofin, M. Pekala

Research output: Contribution to journalArticle

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Abstract

Single-phased nanocrystalline particles of pure and 10 % Ti 4+-doped perovskite-related YFeO 3were prepared via mechanosynthesis at 450C. This temperature is ∼150–350 C lower than those at which the materials, in bulk form, are normally prepared. Rietveld refinements of the X-ray diffraction patterns reveal that the dopant Ti 4+ ions prefer interstitial octahedral sites in the orthorhombic crystal lattice rather than those originally occupied by the expelled Fe 3+ ions. Magnetic measurements show canted antiferromagnetism in both types of nanoparticles. Doping with Ti 4+ lowers the Néel temperature of the YFeO 3 nanoparticles from ∼ 586 K to ∼ 521 K. The Ti 4+-doped YFeO 3 nanoparticles exhibit enhanced magnetization and coercivity but less magnetic hyperfine fields relative to the un-doped nanoparticles. The 57Fe Mössbauer spectra show ∼ 15 % of the YFeO 3 nanoparticles and ∼22 of Ti 4+-doped YFeO 3 ones to be superparamagnetic with blocking temperatures <78 K. The broadened magnetic components in the 57Fe Mössbauer spectra suggest size-dependent hyperfine magnetic fields at the 57Fe nuclear sites and were associated with collective magnetic excitations. The 57Fe Mössbauer spectra show the local environments of the Fe 3+ ions in the superparamagnetic nanoparticles to be more sensitive to the presence of the Ti 4+ ions relative to those in the larger magnetic nanoparticles.

Original languageEnglish
Article number46
JournalHyperfine Interactions
Volume237
Issue number1
DOIs
Publication statusPublished - Dec 1 2016

Fingerprint

sintering
Sintering
Nanoparticles
nanoparticles
Ions
ions
Doping (additives)
Magnetic fields
Antiferromagnetism
Rietveld refinement
Magnetic variables measurement
antiferromagnetism
Coercive force
crystal lattices
Crystal lattices
Temperature
Diffraction patterns
magnetic measurement
coercivity
temperature

Keywords

  • Mechanical milling
  • Mössbauer spectrscopy
  • Nanocrystalline particles
  • Yttrium orthoferrite

ASJC Scopus subject areas

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

Cite this

Magnetic and Mössbauer studies of pure and Ti-doped YFeO 3 nanocrystalline particles prepared by mechanical milling and subsequent sintering. / Khalifa, N. O.; Widatallah, H. M.; Gismelseed, A. M.; Al-Mabsali, F. N.; S. Sofin, R. G.; Pekala, M.

In: Hyperfine Interactions, Vol. 237, No. 1, 46, 01.12.2016.

Research output: Contribution to journalArticle

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abstract = "Single-phased nanocrystalline particles of pure and 10 {\%} Ti 4+-doped perovskite-related YFeO 3were prepared via mechanosynthesis at 450∘C. This temperature is ∼150–350 ∘C lower than those at which the materials, in bulk form, are normally prepared. Rietveld refinements of the X-ray diffraction patterns reveal that the dopant Ti 4+ ions prefer interstitial octahedral sites in the orthorhombic crystal lattice rather than those originally occupied by the expelled Fe 3+ ions. Magnetic measurements show canted antiferromagnetism in both types of nanoparticles. Doping with Ti 4+ lowers the N{\'e}el temperature of the YFeO 3 nanoparticles from ∼ 586 K to ∼ 521 K. The Ti 4+-doped YFeO 3 nanoparticles exhibit enhanced magnetization and coercivity but less magnetic hyperfine fields relative to the un-doped nanoparticles. The 57Fe M{\"o}ssbauer spectra show ∼ 15 {\%} of the YFeO 3 nanoparticles and ∼22 of Ti 4+-doped YFeO 3 ones to be superparamagnetic with blocking temperatures <78 K. The broadened magnetic components in the 57Fe M{\"o}ssbauer spectra suggest size-dependent hyperfine magnetic fields at the 57Fe nuclear sites and were associated with collective magnetic excitations. The 57Fe M{\"o}ssbauer spectra show the local environments of the Fe 3+ ions in the superparamagnetic nanoparticles to be more sensitive to the presence of the Ti 4+ ions relative to those in the larger magnetic nanoparticles.",
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AU - Gismelseed, A. M.

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AB - Single-phased nanocrystalline particles of pure and 10 % Ti 4+-doped perovskite-related YFeO 3were prepared via mechanosynthesis at 450∘C. This temperature is ∼150–350 ∘C lower than those at which the materials, in bulk form, are normally prepared. Rietveld refinements of the X-ray diffraction patterns reveal that the dopant Ti 4+ ions prefer interstitial octahedral sites in the orthorhombic crystal lattice rather than those originally occupied by the expelled Fe 3+ ions. Magnetic measurements show canted antiferromagnetism in both types of nanoparticles. Doping with Ti 4+ lowers the Néel temperature of the YFeO 3 nanoparticles from ∼ 586 K to ∼ 521 K. The Ti 4+-doped YFeO 3 nanoparticles exhibit enhanced magnetization and coercivity but less magnetic hyperfine fields relative to the un-doped nanoparticles. The 57Fe Mössbauer spectra show ∼ 15 % of the YFeO 3 nanoparticles and ∼22 of Ti 4+-doped YFeO 3 ones to be superparamagnetic with blocking temperatures <78 K. The broadened magnetic components in the 57Fe Mössbauer spectra suggest size-dependent hyperfine magnetic fields at the 57Fe nuclear sites and were associated with collective magnetic excitations. The 57Fe Mössbauer spectra show the local environments of the Fe 3+ ions in the superparamagnetic nanoparticles to be more sensitive to the presence of the Ti 4+ ions relative to those in the larger magnetic nanoparticles.

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