Novel methods of synthesis and wet-chemical redox analysis for magnetoresistive double-perovskite Sr2FeMoO(6-w)

T. Yamamoto, J. Liimatainen, J. Linden, M. Karppinen*, H. Yamauchi

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

46 Citations (Scopus)

Abstract

An efficient encapsulation synthesis technique and an accurate wet-chemical analysis method for the redox state have been developed for the Sr2FeMoO(6-w) double-perovskite compound known as a magnetoresistance (MR) material. Single-phase Sr2FeMoO(6-w) samples are reproducibly obtained from Sr-Fe-Mo-O mixtures under very low oxygen partial pressures utilizing an Fe/FeO redox couple as the oxygen trap which is encapsulated together with the starting material mixture in an evacuated synthesis ampoule. Coulometric oxidation titration of the lower-valent iron and/or molybdenum species, formed upon dissolving the sample material in acidic solution, was found to reveal the oxygen content of a Sr2FeMoO(6-w) sample with high reproducibility. Furthermore, the initial potential level in the titration is believed to indicate the nature of the reduced species. In the samples synthesized with the present encapsulation technique at 1150°C the oxygen non-stoichiometry was found to be w ≃ 0.03 ± 0.02. No indication of lower-valent molybdenum was observed.

Original languageEnglish
Pages (from-to)2342-2345
Number of pages4
JournalJournal of Materials Chemistry
Volume10
Issue number10
DOIs
Publication statusPublished - 2000
MoE publication typeA1 Journal article-refereed

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