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

被引：47

作者：

Ishikawa, R ^{[1
]}

Ono, Y ^{[1
]}

Miyazaki, Y ^{[1
]}

Kajitani, T ^{[1
]}

机构：

[1] Tohoku Univ, Grad Sch Engn, Dept Appl Phys, Aoba Ku, Sendai, Miyagi 9808579, Japan

来源：

JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS | 2002年 / 41卷 / 3B期

关键词：

ion exchange; layered oxide; Seebeck coefficient; electric resistivity; strontium cobalt oxide;

D O I：

10.1143/JJAP.41.L337

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

A new layered strontium cobaltite, SrxCoO2, was synthesized by a low-temperature ion-exchange technique from a gamma-Na0.7CoO2 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 P6(3)/nunc). The chemical content of strontium ions was determined as x = 0.346(3) relative to cobalt C ions. A polycrystalline sample of Sr0.35CoO2 shows metallic electric resistivity below 300 K. The Seebeck coefficient is about 70 muV.K-1 at 300 K, which is comparable to that of gamma-Na0.7CoO2.

引用

页码：L337 / L339

页数：3

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