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

Ryuji Ishikawa, Yasuhiro Ono, Yuzuru Miyazaki, Tsuyoshi Kajitani

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46 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)L337-L339
JournalJapanese Journal of Applied Physics, Part 2: Letters
Volume41
Issue number3 B
DOIs
Publication statusPublished - 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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