Low-temperature synthesis and electric properties of new layered cobaltite, SrxCoO2

Ryuji Ishikawa; Yasuhiro Ono; Yuzuru Miyazaki; Tsuyoshi Kajitani

doi:10.1143/jjap.41.l337

Low-temperature synthesis and electric properties of new layered cobaltite, Sr_xCoO₂

Ryuji Ishikawa, Yasuhiro Ono, Yuzuru Miyazaki, Tsuyoshi Kajitani

ENG - Applied Physics

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

46 Citations (Scopus)

Abstract

A new layered strontium cobaltite, Sr_xCoO₂, was synthesized by a low-temperature ion-exchange technique from a γNa_0.7CoO₂ precursor. The strontium content was determined to be x = 0.345 by inductively coupled plasma (ICP) analysis. Rietveld analysis of X-ray powder diffraction data indicates that strontium ions are preferentially distributed at the 2d (2/3, 1/3, 1/4) site (space group P6₃/mmc). The chemical content of strontium ions was determined as x = 0.346(3) relative to cobalt ions. A polycrystalline sample of Sr_0.35CoO₂ shows metallic electric resistivity below 300 K. The Seebeck coefficient is about 70 μV·K^-1 at 300 K, which is comparable to that of γ-Na_0.7CoO₂.

Original language	English
Pages (from-to)	L337-L339
Journal	Japanese Journal of Applied Physics, Part 2: Letters
Volume	41
Issue number	3 B
DOIs	https://doi.org/10.1143/jjap.41.l337
Publication status	Published - 2002 Mar 15

Keywords

Electric resistivity
Ion exchange
Layered oxide
Seebeck coefficient
Strontium cobalt oxide

ASJC Scopus subject areas

Engineering(all)
Physics and Astronomy (miscellaneous)
Physics and Astronomy(all)

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title = "Low-temperature synthesis and electric properties of new layered cobaltite, SrxCoO2",

abstract = "A new layered strontium cobaltite, SrxCoO2, was synthesized by a low-temperature ion-exchange technique from a γNa0.7CoO2 precursor. The strontium content was determined to be x = 0.345 by inductively coupled plasma (ICP) analysis. Rietveld analysis of X-ray powder diffraction data indicates that strontium ions are preferentially distributed at the 2d (2/3, 1/3, 1/4) site (space group P63/mmc). The chemical content of strontium ions was determined as x = 0.346(3) relative to cobalt ions. A polycrystalline sample of Sr0.35CoO2 shows metallic electric resistivity below 300 K. The Seebeck coefficient is about 70 μV·K-1 at 300 K, which is comparable to that of γ-Na0.7CoO2.",

keywords = "Electric resistivity, Ion exchange, Layered oxide, Seebeck coefficient, Strontium cobalt oxide",

author = "Ryuji Ishikawa and Yasuhiro Ono and Yuzuru Miyazaki and Tsuyoshi Kajitani",

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AU - Ishikawa, Ryuji

AU - Ono, Yasuhiro

AU - Miyazaki, Yuzuru

AU - Kajitani, Tsuyoshi

PY - 2002/3/15

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N2 - A new layered strontium cobaltite, SrxCoO2, was synthesized by a low-temperature ion-exchange technique from a γNa0.7CoO2 precursor. The strontium content was determined to be x = 0.345 by inductively coupled plasma (ICP) analysis. Rietveld analysis of X-ray powder diffraction data indicates that strontium ions are preferentially distributed at the 2d (2/3, 1/3, 1/4) site (space group P63/mmc). The chemical content of strontium ions was determined as x = 0.346(3) relative to cobalt ions. A polycrystalline sample of Sr0.35CoO2 shows metallic electric resistivity below 300 K. The Seebeck coefficient is about 70 μV·K-1 at 300 K, which is comparable to that of γ-Na0.7CoO2.

AB - A new layered strontium cobaltite, SrxCoO2, was synthesized by a low-temperature ion-exchange technique from a γNa0.7CoO2 precursor. The strontium content was determined to be x = 0.345 by inductively coupled plasma (ICP) analysis. Rietveld analysis of X-ray powder diffraction data indicates that strontium ions are preferentially distributed at the 2d (2/3, 1/3, 1/4) site (space group P63/mmc). The chemical content of strontium ions was determined as x = 0.346(3) relative to cobalt ions. A polycrystalline sample of Sr0.35CoO2 shows metallic electric resistivity below 300 K. The Seebeck coefficient is about 70 μV·K-1 at 300 K, which is comparable to that of γ-Na0.7CoO2.

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