Crystal structure of the parent misfit-layered cobalt oxide [Sr2O2]qCoO2

T. Nagai, K. Sakai, M. Karppinen, T. Asaka, K. Kimoto, Atsushi Yamazaki, H. Yamauchi, Y. Matsui

    Research output: Contribution to journalArticle

    12 Citations (Scopus)

    Abstract

    The crystal structure of our newly discovered Sr-Co-O phase is investigated in detail through high-resolution electron microscopy (HREM) techniques. Electron diffraction (ED) measurement together with energy dispersive X-ray spectroscopy (EDS) analysis show that an ampoule-synthesized sample contains an unknown Sr-Co-O ternary phase with monoclinic symmetry and the cation ratio of Sr/Co=1. From HREM images a layered structure with a regular stacking of a CdI2-type CoO2 sheet and a rock-salt-type Sr2O2 double-layered block is observed, which confirms that the phase is the parent of the more complex "misfit-layered (ML)" cobalt oxides of [MmA2Om+2]qCoO2 with the formula of [Sr2O2]qCoO2, i.e. m = 0. It is revealed that the misfit parameter q is 0.5, i.e. the two sublattices of the CoO2 sheet and the Sr2O2 block coexist to form a commensurate composite structure. We propose a structural model with monoclinic P21/m symmetry, which is supported by simulations of ED patterns and HREM images based on dynamical diffraction theory.

    Original languageEnglish
    Pages (from-to)1898-1903
    Number of pages6
    JournalJournal of Solid State Chemistry
    Volume179
    Issue number6
    DOIs
    Publication statusPublished - 2006 Jun

    Fingerprint

    cobalt oxides
    High resolution electron microscopy
    Cobalt
    electron microscopy
    Crystal structure
    Electron diffraction
    crystal structure
    Oxides
    high resolution
    electron diffraction
    ampoules
    halites
    composite structures
    symmetry
    Composite structures
    Diffraction patterns
    sublattices
    Cations
    Energy dispersive spectroscopy
    diffraction patterns

    Keywords

    • Electron diffraction
    • High resolution electron microscopy
    • Misfit-layered cobalt oxide
    • Strontium cobalt oxide
    • Thermoelectric material
    • Transmission electron microscopy

    ASJC Scopus subject areas

    • Inorganic Chemistry
    • Physical and Theoretical Chemistry
    • Materials Chemistry

    Cite this

    Crystal structure of the parent misfit-layered cobalt oxide [Sr2O2]qCoO2 . / Nagai, T.; Sakai, K.; Karppinen, M.; Asaka, T.; Kimoto, K.; Yamazaki, Atsushi; Yamauchi, H.; Matsui, Y.

    In: Journal of Solid State Chemistry, Vol. 179, No. 6, 06.2006, p. 1898-1903.

    Research output: Contribution to journalArticle

    Nagai, T, Sakai, K, Karppinen, M, Asaka, T, Kimoto, K, Yamazaki, A, Yamauchi, H & Matsui, Y 2006, 'Crystal structure of the parent misfit-layered cobalt oxide [Sr2O2]qCoO2 ', Journal of Solid State Chemistry, vol. 179, no. 6, pp. 1898-1903. https://doi.org/10.1016/j.jssc.2006.03.016
    Nagai, T. ; Sakai, K. ; Karppinen, M. ; Asaka, T. ; Kimoto, K. ; Yamazaki, Atsushi ; Yamauchi, H. ; Matsui, Y. / Crystal structure of the parent misfit-layered cobalt oxide [Sr2O2]qCoO2 In: Journal of Solid State Chemistry. 2006 ; Vol. 179, No. 6. pp. 1898-1903.
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