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

2 Citations (Scopus)

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

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

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