High electrical conductivity of layered cobalt oxide Ca3Co4O9 epitaxial films grown by topotactic ion-exchange method

被引：61

作者：

Sugiura, Kenji

Ohta, Hiromichi

Nomura, Kenji

Hirano, Masahiro

Hosono, Hideo

Koumoto, Kunihito

机构：

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

[2] Tokyo Inst Technol, JST, ERATO, SORST,Frontier Collaborat Res Ctr, Yokohama, Kanagawa 2268503, Japan

[3] JST, CREST, Kawaguchi 3320012, Japan

来源：

APPLIED PHYSICS LETTERS | 2006年 / 89卷 / 03期

关键词：

D O I：

10.1063/1.2234277

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Epitaxial film of a layered cobalt oxide, Ca3Co4O9, was fabricated on a (0001) face of an alpha-Al2O3 substrate by a topotactic ion-exchange method using a gamma-Na0.8CoO2 epitaxial film as a precursor. High-resolution x-ray diffraction and atomic force microscope measurements revealed that the film was high-quality (001)-oriented Ca3Co4O9 with stepped and terraced surface morphology. The film exhibits a high electrical conductivity of 2.95x10(2) S cm(-1) and a large Seebeck coefficient of similar to+125 mu V K-1, which leads to the thermoelectric power factor (TPF) of 4.5x10(-4) W m(-1) K-2 at 300 K, potentially usable as a building block of the multilayered film structure with an enhanced TPF value. (c) 2006 American Institute of Physics.

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