Preparation-dependent properties of Ca(Cu,Mn)7O12 CMR materials

D. M. Itkis, E. A. Goodilin, A. M. Balagurov, I. A. Bobrikov, A. S. Sinitskii, Y. D. Tretyakov

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

Both magnetic ordering temperatures and lattice constants were observed to be a function of preparation temperature for single-phase CaCuMn6O12 CMR ceramics of the same cation, oxygen composition and crystal structure. It was found for the first time that higher preparation temperatures Tprep result in a linear increase of a cubic cell parameter a, Δ a / Δ Tprep ∼ 4 × 1 0- 5 Å /{ring operator} C, and in a sharp decrease of magnetic ordering temperatures Tcrit, by about Δ Tcrit / Δ Tprep ∼ 3 / 5, for quenched samples. High resolution NPD experiments have shown the presence of antisite defects resulting in partial occupation of octahedral (8c) sites by Cu2+ at higher preparation temperatures as never assumed for an ideal structure. The data obtained give a new insight to the problem of functional properties reproducibility suggesting stronger requirements for the production control of CMR materials.

Original languageEnglish (US)
Pages (from-to)380-385
Number of pages6
JournalSolid State Communications
Volume139
Issue number7
DOIs
StatePublished - Aug 2006
Externally publishedYes

Keywords

  • A. CMR materials
  • A. Manganites
  • C. Neutron powder diffraction
  • D. Antisite disorder

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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