Structural, 57Fe Mössbauer and XPS studies of mechanosynthesized nanocrystalline Nd0.33Eu0.67Fe1-xCrxO3 particles

K. S. Al-Rashdi, H. M. Widatallah*, M. E. Elzain, A. M. Gismelseed, A. D. Al-Rawas, M. T.Z. Myint, F. S. Al Mawali, S. H. Al-Harthi, E. A. Moore, E. M. Crabb

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

We report on the structure and surface composition of Nd0.33Eu0.67Fe1-xCrxO3 (x = 0.0, 0.3, 0.5, 0.7, 0.9 and 1.0) nanoparticles (∼30 nm) mechanosynthesized at temperatures that are ∼ 470–700 °C lower than those at which the pure and doped pristine materials conventionally form. XRD Rietveld and FT-IR analyses show that with increasing x the lattice parameters decrease and the bond lengths and angles vary in a way that reduces crystalline distortion. Whilst the majority of the Eu3+/Nd3+ and Fe3+/Cr3+ cations occupy their normal perovskite-related A- and B-sites, respectively, ∼ 5 % of them exchange sites. 57Fe Mössbauer spectroscopy favours the presence of these antisites and reveals a superparamagnetic behaviour at 298 K that enhances with increasing x. XPS measurement reveals a complex surface composition of the nanoparticles with traces of Eu2O3, Nd2O3, Cr2O3 and Fe2O3 as well as partial O2−-deficiency.

Original languageEnglish
Article number111004
JournalMaterials Research Bulletin
Volume132
DOIs
Publication statusPublished - Dec 2020
Externally publishedYes

Keywords

  • Mechanosynthesis
  • Mössbauer spectroscopy
  • Orthoferrites
  • XPS
  • XRD

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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