Chemical tuning of structure, magnetization, and conductivity in the self-doped double-perovskite (Sr2-xCax)FeMoO6 (0 ≤ x ≤ 2.0) System

T. S. Chan, R. S. Liu, G. Y. Guo, Shu-Fen Hu, J. G. Lin, J. M. Chen, J. P. Attfield

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Abstract

The variations of crystal structure, magnetization, and conductivity resulting from the chemical pressure effects of substituting Sr2+ by the smaller Ca2+ in the double-perovskite (Sr2-xCax)FeMoO6 have been investigated. An increase in the Ca content leads to an increase in the Fe/Mo ordering in the materials, which raises the magnetic moments close to the theoretical value of 4, μB. An increase in conductivity with increasing Ca content is also found and is consistent with an increase in (Fe2+ + Mo6+)/(Fe3+ + Mo5+) band overlap rather than bandwidth changes. The changes observed by physical measurements are supported by the X-ray absorption near-edge structures of Fe and Mo and by band structure calculations.

Original languageEnglish
Pages (from-to)425-432
Number of pages8
JournalChemistry of Materials
Volume15
Issue number2
DOIs
Publication statusPublished - 2003 Jan 1

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ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Chemistry

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