Kinetics and Thermodynamics of the Degree of Order of the B Cations in Double-Perovskite Sr2FeMoO6

T. Shimada, J. Nakamura, T. Motohashi, H. Yamauchi, M. Karppinen*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

55 Citations (Scopus)

Abstract

Here we show that the B-site cation (Fe/Mo) ordering in the double-perovskite magnetoresistor, Sr2FeMoO6, is controlled by either kinetics or thermal equilibrium depending on the temperature range. To enhance the ordering, long synthesis periods at moderate temperatures are thus required. Employment of a special oxygen-getter-controlled low-O2-pressure encapsulation technique for the sample synthesis enabled us to use long heating periods without evident evaporation of Mo, and thereby reach the thermal equilibrium state and a high degree of B-site cation order. For samples fired at 1150 °C for long periods (≥36 h), record-high Ms values of 3.7-3.9 μB were obtained.

Original languageEnglish
Pages (from-to)4494-4497
Number of pages4
JournalChemistry of Materials
Volume15
Issue number23
DOIs
Publication statusPublished - 18 Nov 2003
MoE publication typeA1 Journal article-refereed

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