Sodium ion ordering in NaxCoO2: Electron diffraction study

H. W. Zandbergen, M. Foo, Q. Xu, V. Kumar, R. J. Cava

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Abstract

The layered sodium cobalt oxide NaxCoO2 is studied by electron diffraction for a wide range of sodium contents, 0.15<x<0.75. An extensive series of ordered Na ion-Na vacancy superlattices is found beyond the simple hexagonal average structure. The most strongly developed superlattice is found for the composition Na0.5CoO2, which displays Co3+/Co4+ charge ordering at low temperatures. The structural principle for some of the observed ordering schemes, particularly, near x=0.5, is, surprisingly, the presence of lines of Na ions and vacancies rather than simply maximized Na-Na separations.

Original languageEnglish (US)
Article number024101
Pages (from-to)024101-1-024101-8
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume70
Issue number2
DOIs
StatePublished - Jul 1 2004

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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