The oxygen deficient cubic perovskite SrFe1-xSc xO3-δ (x ≤ 0.5; 0.1 ≤ δ ≤ 0.5): Structural features and physical properties

Youssef Rizki, Yohann Bréard, Jean Marie Le Breton, Emeric Folcke, Luc Lechevallier, Wataru Kobayashi, Antoine Maignan

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Solid state synthesis method has been used to stabilize oxygen deficient perovskite phases SrFe1-xScxO3-δ (0 ≤ x ≤ 0.5). The good homogeneity of samples is confirmed by energy dispersive spectroscopy (EDS) analysis performed with a transmission electronic microscope (TEM). By combining X-ray and electronic diffraction (ED), it is demonstrated that the cationic substitution on the B site of the perovskite induces a decrease of the oxygen content but without inducing long range ordering phenomenon. On this basis, X-ray patterns of compounds were indexed in the cubic Pm3m space group. The oxidation states of iron evidenced by Mössbauer spectroscopy, are in good agreement with the oxygen stoichiometries determined by cerimetric titration. In the SrFe1-xScxO 3-δ series, the Fe3+/Fe4+ origin of the electronic conductivity is clearly evidenced. The limit compound SrFe 0.5Sc0.5O2.5 is highly resistive and characterized by a cluster glass-like behaviour. Finally, negative magnetoresistivity properties are revealed for the x = 0.1 and x = 0.2 samples, reaching -10% around the magnetic transition temperature in a 7T magnetic field.

Original languageEnglish
Pages (from-to)1661-1666
Number of pages6
JournalSolid State Sciences
Volume12
Issue number9
DOIs
Publication statusPublished - 2010 Sep
Externally publishedYes

Keywords

  • Iron valence state
  • Magnetoresistance
  • Perovskites

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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