Variation of oxygen stoichiometry in BaRE(Cu0.5Fe0.5)2O(5+δ) double perovskites upon heat treatments under ambient and high pressure

K. Lehmus, M. Kochi, M. Karppinen*, H. Yamauchi, L. Niinistö

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

10 Citations (Scopus)

Abstract

The tunability of the oxygen stoichiometry in the BaRE(Cu0.5Fe0.5)2O5+(}(d) double-perovskite structure, stable with rare earth elements RE=Lu-Pr. was studied by both normal-pressure thermogravimetric oxidative (O2) and deoxidative (Ar) post-annealings and high-pressure heat treatments carried out in a cubic-anvil-type high-pressure apparatus. Under reducing conditions the BaRE(Cu0.5Fe0.5)2O5+(}(d) double perovskite is obtained at δ≃0 irrespective of the size of the RE constituent. In the structures with RE=Pr and Nd the oxygen stoichiometry can be continuously varied by normal-pressure post-annealings up to δ≃0.24 and 0.35, respectively, whereas with a smaller rare earth ion, i.e., RE=Lu-Sm, the amount of excess oxygen raises from δ≃0 only upon high-pressure heat treatment. (C) 2000 Elsevier Science Ltd.

Original languageEnglish
Pages (from-to)203-208
Number of pages6
JournalInternational Journal of Inorganic Materials
Volume2
Issue number2-3
DOIs
Publication statusPublished - 2000
MoE publication typeA1 Journal article-refereed

Keywords

  • A. oxides
  • C. thermogravimetric analysis
  • D. superconductivity
  • High pressure

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