Synthesis, crystal structure and physical properties of layered cobalt oxide Ca_xCoO_2 (x〜0.47)

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概要

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• We have synthesized a single-phase sample of the compound known as CaCo_2O_4 and investigated its crystal structure by means of a single crystal X-ray diffraction technique. The compound crystallizes in a triclinic system (space group P1) with lattice parameters of a=492.4(2)pm, b=568.3(3)pm, c=568.5(3)pm, α=75.400(9)°, β=89.974(9)° and γ=81.261(9)° at 293(2)K. The structure consists of an alternate stack of a CdI_2-type CoO_2 triangular sheet and a layer of Ca atoms, showing great similarity to that of β-Na_xCoO_2 (x〜0.67). However, the Ca atom has four crystallographic sites with different occupation probabilities, leading to the structure formula Ca_<1.87(5)>Co_4O_8 (Ca_<0.47(1)>CoO_2). Due to a low bulk density as well as a small number of hole carriers, equivalent to the nominal valence state of Co ions close to 3.06, a polycrystalline sample of the Caphase exhibits much higher electrical resistivity ρ=680μΩm, relative to that of the Na-phase ρ=1.2μΩm, with a large positive Seebeck coefficient of S=145μV/K at 300K.

• 2009-01-01

著者

• 山根 久典

  Institute of Multidisciplinary Research for Advanced Materials, Tohoku University

• MIYAZAKI Yuzuru

  Department of Applied Physics, Graduate School of Engineering, Tohoku University

• HUANG Xiangyang

  Core Research for Evolutional Science and Technology, Japan Science and Technology Agency

• KAJIWARA Takashi

  Department of Chemistry, Graduate School of Science, Tohoku University

• YAMANE Hisanori

  Institute of Multidisciplinary Research for Advanced Materials, Tohoku University

• KAJITANI Tsuyoshi

  Department of Applied Physics, Graduate School of Engineering, Tohoku University

• 宮崎 譲

  東北大工

• 宮崎 譲

  Department Of Applied Physics Graduate School Of Engineering Tohoku University

• 宮崎 譲

  東北大 工

• 宮崎 譲

  東北大学工学部応用物理学科

• 山根 久典

  Institute Of Multidisciplinary Research For Advanced Materials Tohoku University

• Kajiwara Takashi

  Dep. Of Chemistry Graduate School Of Sci. Tohoku Univ.

• Kajitani Tsuyoshi

  Department Of Applied Physics Faculty Of Engineering Tohoku University

• Yamane H

  Tohoku Univ. Sendai Jpn

• Kajiwara Takashi

  Department Of Cardiovascular Surgery Faculty Of Medicine Kyushu University

• Kajitani Tsuyoshi

  Department Of Applied Physian Fuaully Of Engineering Tohoku University

• Muto Yoshio

  Institute For Materials Research (imr) Tohoku University

• Yamane Hisanori

  Institute For Materials Research Tohoku University

• Kawashima Takuya

  Department Of Chemistry Graduate School Of Science Tohoku University & Crest(jst)

• Huang Xiangyang

  Core Research For Evolutional Science And Technology Japan Science And Technology Agency

• Kawashima Takuya

  Graduate School Of Human Informatics Nagoya University

• Kato T

  Dep. Of Chemistry Graduate School Of Sci. Tohoku Univ.

• Miyazaki Yuzuru

  Department Of Applied Physics Graduate School Of Engineering Tohoku University

• Kajiwara Takashi

  Department of Applied Physics, Graduate School of Engineering, Tohoku University

• Kajiwara Takashi

  Department of Aeronautics and Astronautics, Faculty of Engineering, Kyushu University, Motooka, Nishi-ku, Fukuoka 819-0395, Japan

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