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A new layered strontium cobaltite, Sr x CoO 2 , was synthesized by a low-temperature ion-exchange technique from a γ-Na 0.7 CoO 2 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 P6 3 /mmc). The chemical content of strontium ions was determined as x = 0.346(3) relative to cobalt ions. A polycrystalline sample of Sr 0.35 CoO 2 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 0.7 CoO 2 .
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Ishikawa et al. (2002) studied this question.
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