Low temperature phase transitions and crystal structure of Na 0.5CoO2

Q. Huang, M. L. Foo, J. W. Lynn, H. W. Zandbergen, G. Lawes, Yayu Wang, B. H. Toby, A. P. Ramirez, N. P. Ong, R. J. Cava

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Abstract

Specific heat measurements on Na0.5CoO2 show that the transitions observed at 87 and 53 K in the resistivity and magnetic susceptibility are accompanied by changes in entropy, whereas the one near 20 K is not. Electron diffraction studies suggest that the 87 K transition has a structural component. The crystal structure of Na0.5CoO2, determined by powder neutron diffraction, consists of layers of edge-shared CoO6 octahedra in a triangular lattice, with Na ions occupying ordered positions in the interleaving planes. The Na ions form one-dimensional zigzag chains. Two types of Co ions are also found in chains.

Original languageEnglish (US)
Pages (from-to)5803-5814
Number of pages12
JournalJournal of Physics Condensed Matter
Volume16
Issue number32
DOIs
StatePublished - Aug 18 2004

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics

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    Huang, Q., Foo, M. L., Lynn, J. W., Zandbergen, H. W., Lawes, G., Wang, Y., Toby, B. H., Ramirez, A. P., Ong, N. P., & Cava, R. J. (2004). Low temperature phase transitions and crystal structure of Na 0.5CoO2. Journal of Physics Condensed Matter, 16(32), 5803-5814. https://doi.org/10.1088/0953-8984/16/32/016