X-ray absorption spectroscopy in NaCo2O4, LaCoO3 and SrCoO3

Tomohira Matsushita; Masaichiro Mizumaki; Naoshi Ikeda; Makoto Nakazawa; Akane Agui; Yuji Saitoh; Takeshi Nakatani; Akitaka Yoshigoe; Shin Nakamura

doi:10.1142/S0218625X02003755

X-ray absorption spectroscopy in NaCo₂O₄, LaCoO₃ and SrCoO₃

Tomohira Matsushita, Masaichiro Mizumaki, Naoshi Ikeda, Makoto Nakazawa, Akane Agui, Yuji Saitoh, Takeshi Nakatani, Akitaka Yoshigoe, Shin Nakamura

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

We have performed Co 2p x-ray absorption spectroscopy (XAS) on a mixed valence hexagonal layered system NaCo₂O₄, which shows large thermopower and metallic conductivity. We also measured XAS for SrCoO₃ and LaCo_O3 as examples of typical Co ionic states. The Co ions of the last two materials are octahedrally surrounded by oxygen atoms. A Co atom in NaCo₂O₄ also has octahedral coordination with oxygen atoms but it is distorted slightly. The Co ions in SrCoO₃ and LaCoO₃ are in the d⁵ and d⁶ configuration respectively. The spectrum of NaCo₂O₄ resembles that of LaCoO₃ rather than that of SrCoO₃; the Co ions in NaCo₂O₄ can be regarded as the d⁶ configuration. 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 Co 3d states.

Original language	English
Pages (from-to)	1327-1331
Number of pages	5
Journal	Surface Review and Letters
Volume	9
Issue number	2
DOIs	https://doi.org/10.1142/S0218625X02003755
Publication status	Published - Apr 2002
Externally published	Yes

ASJC Scopus subject areas

Condensed Matter Physics
Surfaces and Interfaces
Surfaces, Coatings and Films
Materials Chemistry

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title = "X-ray absorption spectroscopy in NaCo2O4, LaCoO3 and SrCoO3",

abstract = "We have performed Co 2p x-ray absorption spectroscopy (XAS) on a mixed valence hexagonal layered system NaCo2O4, which shows large thermopower and metallic conductivity. We also measured XAS for SrCoO3 and LaCoO3 as examples of typical Co ionic states. The Co ions of the last two materials are octahedrally surrounded by oxygen atoms. A Co atom in NaCo2O4 also has octahedral coordination with oxygen atoms but it is distorted slightly. The Co ions in SrCoO3 and LaCoO3 are in the d5 and d6 configuration respectively. The spectrum of NaCo2O4 resembles that of LaCoO3 rather than that of SrCoO3; the Co ions in NaCo2O4 can be regarded as the d6 configuration. 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 Co 3d states.",

author = "Tomohira Matsushita and Masaichiro Mizumaki and Naoshi Ikeda and Makoto Nakazawa and Akane Agui and Yuji Saitoh and Takeshi Nakatani and Akitaka Yoshigoe and Shin Nakamura",

year = "2002",

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doi = "10.1142/S0218625X02003755",

language = "English",

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T1 - X-ray absorption spectroscopy in NaCo2O4, LaCoO3 and SrCoO3

AU - Matsushita, Tomohira

AU - Mizumaki, Masaichiro

AU - Ikeda, Naoshi

AU - Nakazawa, Makoto

AU - Agui, Akane

AU - Saitoh, Yuji

AU - Nakatani, Takeshi

AU - Yoshigoe, Akitaka

AU - Nakamura, Shin

PY - 2002/4

Y1 - 2002/4

N2 - We have performed Co 2p x-ray absorption spectroscopy (XAS) on a mixed valence hexagonal layered system NaCo2O4, which shows large thermopower and metallic conductivity. We also measured XAS for SrCoO3 and LaCoO3 as examples of typical Co ionic states. The Co ions of the last two materials are octahedrally surrounded by oxygen atoms. A Co atom in NaCo2O4 also has octahedral coordination with oxygen atoms but it is distorted slightly. The Co ions in SrCoO3 and LaCoO3 are in the d5 and d6 configuration respectively. The spectrum of NaCo2O4 resembles that of LaCoO3 rather than that of SrCoO3; the Co ions in NaCo2O4 can be regarded as the d6 configuration. 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 Co 3d states.

AB - We have performed Co 2p x-ray absorption spectroscopy (XAS) on a mixed valence hexagonal layered system NaCo2O4, which shows large thermopower and metallic conductivity. We also measured XAS for SrCoO3 and LaCoO3 as examples of typical Co ionic states. The Co ions of the last two materials are octahedrally surrounded by oxygen atoms. A Co atom in NaCo2O4 also has octahedral coordination with oxygen atoms but it is distorted slightly. The Co ions in SrCoO3 and LaCoO3 are in the d5 and d6 configuration respectively. The spectrum of NaCo2O4 resembles that of LaCoO3 rather than that of SrCoO3; the Co ions in NaCo2O4 can be regarded as the d6 configuration. 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 Co 3d states.

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X-ray absorption spectroscopy in NaCo₂O₄, LaCoO₃ and SrCoO₃

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