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

47 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)

Access to Document

10.1143/jjap.41.l337

Cite this

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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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T1 - Low-temperature synthesis and electric properties of new layered cobaltite, SrxCoO2

AU - Ishikawa, Ryuji

AU - Ono, Yasuhiro

AU - Miyazaki, Yuzuru

AU - Kajitani, Tsuyoshi

PY - 2002/3/15

Y1 - 2002/3/15

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.

KW - Electric resistivity

KW - Ion exchange

KW - Layered oxide

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KW - Strontium cobalt oxide

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