57Fe Mössbauer spectroscopy investigation of the Fe II/III mixed-valence state and the B-site order in double perovskite A2FeMoO6

Johan Lindén*, Hisao Yamauchi, Maarit Karppinen

*Corresponding author for this work

Research output: Contribution to journalConference articleScientificpeer-review

4 Citations (Scopus)

Abstract

B-site ordered double-perovskite samples A2FeMoO6, with A=Ca, Sr or Ba were synthesized in a reducing atmosphere using an encapsulation technique. The samples were characterized by 57Fe Mössbauer spectroscopy. The valence of Fe was found to be in an intermediate II/III state, being close to the midpoint for A=Sr and slightly shifted towards II for Ba. The degree of B-site ordering was found to be more than 95%. Using various synthesis temperatures the ordering could be tuned. Fe atoms replacing Mo at the antisite and adjacent to it were identified in the Mössbauer data. Presence of antiphase boundaries was also seen.

Original languageEnglish
Pages (from-to)843-844
Number of pages2
JournalJournal of Magnetism and Magnetic Materials
Volume272-276
DOIs
Publication statusPublished - May 2004
MoE publication typeA4 Article in a conference publication
EventProceedings of the International Conference on Magnetism - Rome, Italy
Duration: 27 Jul 20031 Aug 2003

Keywords

  • Double perovskite
  • Halfmetal
  • Mössbauer
  • Valence mixing

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