Crystal structure, electric and magnetic properties of layered cobaltite β-NaxCoO2

Y. Ono, R. Ishikawa, Y. Miyazaki, Y. Ishii, Y. Morii, T. Kajitani

Research output: Contribution to journalArticle

77 Citations (Scopus)

Abstract

The layered oxide thermoelectric material β-Na0.67CoO2 has been studied by powder neutron diffraction, electric and magnetic measurements. This compound includes an edge-sharing CoO6 slab and a highly vacant Na+ sheet in a unit cell (space group symmetry C2/m, a = 4.9023(4) Å, b = 2.8280(2) Å, c = 5.7198(6) Å and β = 105.964(6)° at 300 K). The evaluated formal valence of cobalt ion, +3.33(1), is ascribed to the coexistence of Co3+ and Co4+ in the ratio 2:1. Polycrystalline β-Na0.67CoO2, a p-type thermoelectric material, exhibits metallic behavior of the electric resistivity below 300 K. The Curie-Weiss-type magnetic susceptibility indicates antiferromagnetic interactions between magnetic cobalt ions in the edge-sharing CoO6 slab.

Original languageEnglish
Pages (from-to)177-181
Number of pages5
JournalJournal of Solid State Chemistry
Volume166
Issue number1
DOIs
Publication statusPublished - 2002 Jan 1

Keywords

  • Layered cobaltite
  • Mixed valence
  • NaCoO
  • Neutron diffraction
  • Thermoelectric material

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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