Synthesis and magnetic properties of the quasi-one-dimensional compound Ca0.83(Cu1-xCox)O2

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Abstract

A new solid solution of the quasi-one-dimensional composite crystal, Ca0.83(Cu1-xCox)O2(0≤x≤0.30), has been synthesized under 1 atm of O2 at 830°C. The non-doped compound Ca0.83CuO2 consists of two interpenetrating monoclinic subsystems of the [Ca] atoms and the edge-shared square planar [CuO2] chains. Upon increasing x, both the subsystems undergo a phase change from monoclinic to orthorhombic (M-O). The M-O change occurs at x∼0.04 for the [(Cu,Co)O2] subsystem, while such a change occurs at x∼0.17 for the [Ca] subsystem. Magnetic susceptibility measurements show an evolution from a short-range ordered state near x=0 to a long-range antiferromagnetic state (TN=10-15 K) for the samples with x≥0.15. The effective magnetic moment μeff is found to increase with increasing x from 2.1 μB for x=0.10 to 3.0 μB for x=0.30, suggesting that the solid solution can be regarded as Ca 0.83[Cu0.662+Cu0.34-x 3+Cox3+]O2, in which a mixed state of Cu2+(S=1/2), Cu3+(S=0) and high-spin Co 3+(S=2) ions is realized.

Original languageEnglish
Pages (from-to)73-79
Number of pages7
JournalJournal of Solid State Chemistry
Volume177
Issue number1
DOIs
Publication statusPublished - 2004 Jan

Keywords

  • Calcium cobalt copper oxide
  • Composite crystal
  • Low-dimensional compound
  • Magnetic susceptibility
  • Substitution effects

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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