Low temperature phase transitions and crystal structure of Na0.5CoO2

By Q. Huang, M. Foo, J. W. Lynn, H. Zandbergen, G. Lawes, Yayu Wang, B H Toby, A. P. Ramirez, N. P. Ong, R. J. Cava. 2004

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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.

Subfields: Condensed Matter Physics, Electronic, Optical and Magnetic Materials, Materials Chemistry

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Citations in the corpus

• Electrochemical investigation of the P2–NaxCoO2 phase diagram. (2011, background): “For peculiar compositions, electronic localization can be observed, as evidenced by electron diffractio”