Metal valences in electron-doped (Sr,La)2FeTaO6 double perovskite: A 57Fe Mössbauer spectroscopy study

E. L. Rautama, J. Lindén, H. Yamauchi, M. Karppinen*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

4 Citations (Scopus)

Abstract

Substitution of divalent Sr by trivalent La is found to affect the valence states of both of the two B-site cations, Fe and Ta, in the double perovskite oxide (Sr1-xLax)2FeTaO6. Moreover, it improves the degree of order of these cations. From 57Fe Mössbauer spectra the average Fe valence was found to decrease with increasing La substitution level, x. However, the valence of Fe decreased less than expected if the valence of Ta was assumed to remain constant. Hence, we conclude that also the valence of Ta decreases.

Original languageEnglish
Pages (from-to)440-445
Number of pages6
JournalJournal of Solid State Chemistry
Volume180
Issue number2
DOIs
Publication statusPublished - Feb 2007
MoE publication typeA1 Journal article-refereed

Keywords

  • Cation ordering
  • Cation valences
  • Double-perovskite oxide
  • Mössbauer spectroscopy

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