Ca25Co22O56(OH)28: A layered misfit compound

T. Klimczuk, H. W. Zandbergen, N. M. van der Pers, L. Viciu, V. L. Miller, M. H. Lee, R. J. Cava

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Abstract

The high pressure synthesis, structure and magnetic properties of Ca25Co22O56(OH)28 are reported. The compound has a misfit structure, consisting of double, square calcium oxide hydroxide rock-salt-like layers between hexagonal CoO2 layers. The misfit compound crystallizes in the monoclinic space group C2/m, and can be characterized by the coexistence of two subsystems with common a = 4.893(5) Å, c = 8.825(9) Å and β = 95.745(8) parameters, and different b parameters: bRS = 4.894(5) Å, and bHEX = 2.809(3) Å, for the rock-salt and hexagonal type planes, respectively. The compound shows Curie-Weiss paramagnetism with an antiferromagnetic Weiss temperature of -43 K and a reduced Co moment. Substantial deviations from Curie-Weiss behavior are seen below 50 K with no indication of magnetic ordering. No superconductivity was observed down to a temperature of 2 K.

Original languageEnglish (US)
Pages (from-to)1673-1680
Number of pages8
JournalMaterials Research Bulletin
Volume41
Issue number9
DOIs
StatePublished - Sep 14 2006

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Keywords

  • A. Oxides
  • B. Chemical synthesis
  • C. Electron diffraction
  • C. X-ray diffraction

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    Klimczuk, T., Zandbergen, H. W., van der Pers, N. M., Viciu, L., Miller, V. L., Lee, M. H., & Cava, R. J. (2006). Ca25Co22O56(OH)28: A layered misfit compound. Materials Research Bulletin, 41(9), 1673-1680. https://doi.org/10.1016/j.materresbull.2006.02.023