Modulated structure of misfit layered cobalt oxide [(Ca 0.90Bi0.10)2(Co0.95Bi 0.05)O3]pCoO2

Yuzuru Miyazaki, Yousuke Suzuki, Mitsuko Onoda, Yoshinobu Ishii, Yukio Morii, Tsuyoshi Kajitani

研究成果: Article査読

26 被引用数 (Scopus)


We have determined the crystal structure of Bi-substituted and Bi-free misfit layered cobalt oxides [Ca2CoO3] 0.62CoO2, by a (3+1)-dimensional superspace group approach. Structural parameters have been refined with a superspace group of C2/m(1p0)s0 using powder neutron diffraction data. Bismuth atoms are found to substitute for both Ca and Co atoms in the rock salt-type [Ca 2CoO3] subsystem. The resulting structural formula is expressed as [(Ca0.90Bi0.10)2(Co 0.95Bi0.05)O3]pCoO2 with a refined b-axis ratio of p = 0.6183. By Bi substitution, the modulation of the Co-O distances in the [Ca2CoO3] subsystem is markedly decreased relative to the Bi-free counterpart, whereas such a modulation in the [CoO2] subsystem is slightly increased. The observed increase in the Seebeck coefficient and electrical resistivity of the Bi-substituted phase can be explained in terms of the decrease in hole concentration in the CoO 2 sheets.

ジャーナルJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
9 A
出版ステータスPublished - 2004 9

ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

フィンガープリント 「Modulated structure of misfit layered cobalt oxide [(Ca <sub>0.90</sub>Bi<sub>0.10</sub>)<sub>2</sub>(Co<sub>0.95</sub>Bi <sub>0.05</sub>)O<sub>3</sub>]<sub>p</sub>CoO<sub>2</sub>」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。