Thermoelectric performance of epitaxial thin films of layered cobalt oxides grown by reactive solid-phase epitaxy with topotactic ion-exchange methods

被引：10

作者：

Sugiura, Kenji

Ohta, Hiromichi

Koumoto, Kunihito

机构：

[1] Nagoya Univ, Grad Sch Engn, Nagoya, Aichi 4648603, Japan

[2] JST, CREST, Kawaguchi 3320012, Japan

来源：

INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY | 2007年 / 4卷 / 04期

关键词：

D O I：

10.1111/j.1744-7402.2007.02145.x

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

This article reviews high-quality epitaxial film growth of layered cobalt oxides by reactive solid-phase epitaxy (R-SPE) with topotactic ion-exchange methods. Epitaxial film of Na0.8CoO2 was grown on a (0001)-oriented alpha-Al2O3 substrate by R-SPE using CoO film as the starting material. The Na0.8CoO2 epitaxial films were converted into high-quality epitaxial films of Sr0.32Na0.21CoO2 and [Ca2CoO3](x)CoO2 by topotactic ion-exchange methods. The Sr0.32Na0.21CoO2 film exhibited better stability against moisture than that of the Na0.8CoO2 film, while it retained the good thermoelectric properties of Na0.8CoO2. The [Ca2CoO3](x)CoO2 film exhibited a high electrical conductivity of 2.95 x 10(2) S/cm and a large Seebeck coefficient of +125 mu V/K at 300 K.

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页码：308 / 317

页数：10

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