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X-RAY ABSORPTION SPECTROSCOPY INNaCo2O4,LaCoO3andSrCoO3

Author

Listed:
  • TOMOHIRA MATSUSHITA

    (Japan Synchrotron Radiation Research Institute (JASRI), SPring-8, Mikazuki-cho, Sayo-gun, Hyogo 679-5198, Japan)

  • MASAICHIRO MIZUMAKI

    (Japan Synchrotron Radiation Research Institute (JASRI), SPring-8, Mikazuki-cho, Sayo-gun, Hyogo 679-5198, Japan)

  • NAOSHI IKEDA

    (Japan Synchrotron Radiation Research Institute (JASRI), SPring-8, Mikazuki-cho, Sayo-gun, Hyogo 679-5198, Japan)

  • MAKOTO NAKAZAWA

    (Japan Synchrotron Radiation Research Institute (JASRI), SPring-8, Mikazuki-cho, Sayo-gun, Hyogo 679-5198, Japan)

  • AKANE AGUI

    (Synchrotron Radiation Research Center, Japan Atomic Energy Research Institute (JAERI), SPring-8, Mikazuki-cho, Sayo-gun, Hyogo 679-5148, Japan)

  • YUJI SAITOH

    (Synchrotron Radiation Research Center, Japan Atomic Energy Research Institute (JAERI), SPring-8, Mikazuki-cho, Sayo-gun, Hyogo 679-5148, Japan)

  • TAKESHI NAKATANI

    (Synchrotron Radiation Research Center, Japan Atomic Energy Research Institute (JAERI), SPring-8, Mikazuki-cho, Sayo-gun, Hyogo 679-5148, Japan)

  • AKITAKA YOSHIGOE

    (Synchrotron Radiation Research Center, Japan Atomic Energy Research Institute (JAERI), SPring-8, Mikazuki-cho, Sayo-gun, Hyogo 679-5148, Japan)

  • SHIN NAKAMURA

    (School of Science and Engineering, Teikyo University, 1-1 Toyosatodai, Utsunomiya 320, Japan)

Abstract

We have performed Co2pX-ray absorption spectroscopy (XAS) on a mixed valence hexagonal layered systemNaCo2O4, which shows large thermopower and metallic conductivity. We also measured XAS forSrCoO3andLaCoO3as examples of typical Co ionic states. The Co ions of the last two materials are octahedrally surrounded by oxygen atoms. A Co atom inNaCo2O4also has octahedral coordination with oxygen atoms but it is distorted slightly. The Co ions inSrCoO3andLaCoO3are in thed5andd6configuration respectively. The spectrum ofNaCo2O4resembles that ofLaCoO3rather than that ofSrCoO3; the Co ions inNaCo2O4can be regarded as thed6configuration. Also, we have tried to calculate the XAS spectra by using the charge-transfer multiplet model (CT-M). Although we could not find out the best-fitting parameters, the results suggested the itinerancy of the Co3dstates.

Suggested Citation

  • Tomohira Matsushita & Masaichiro Mizumaki & Naoshi Ikeda & Makoto Nakazawa & Akane Agui & Yuji Saitoh & Takeshi Nakatani & Akitaka Yoshigoe & Shin Nakamura, 2002. "X-RAY ABSORPTION SPECTROSCOPY INNaCo2O4,LaCoO3andSrCoO3," Surface Review and Letters (SRL), World Scientific Publishing Co. Pte. Ltd., vol. 9(02), pages 1327-1331.
    • Handle: RePEc:wsi:srlxxx:v:09:y:2002:i:02:n:s0218625x02003755
    DOI: 10.1142/S0218625X02003755
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