Synthesis and thermoelectric properties of magnetically c-axis-oriented [Ca2CoO3-δ]0.62CoO2 bulk with various oxygen contents

被引：40

作者：

Sano, M

Horii, S

Matsubara, I

Funahashi, R

Shikano, M

Shimoyama, J

Kishio, K

机构：

[1] Univ Tokyo, Sch Engn, Dept Appl Chem, Bunkyo Ku, Tokyo 1138656, Japan

[2] Natl Inst Adv Ind Sci & Technol, Ikeda, Osaka 5638577, Japan

[3] Japan Sci & Technol Corp, JST, PRESTO, Kawaguchi, Saitama 3320012, Japan

来源：

JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS | 2003年 / 42卷 / 2B期

关键词：

thermoelectric materials; Ca2CoO3-delta](0.62)CoO2; spark plasma sintering; magnetic alignment; oxygen nonstoichiometry;

D O I：

10.1143/JJAP.42.L198

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We report the preparation of highly grain-aligned and densified [Ca2CoO3-delta](0.62)CoO2 bulks and their high thermoelectric performance. The highly c-axis aligned (F = 0.94) and densitied samples with low resistivity at room temperature (similar to5 mOmega (.)cm) were obtained by the combination of magnetic alignment and spark-plasma-sintering (SPS) methods. Resistivity rho and Seebeck coefficient S along the ab plane were systematically changed with oxygen content and, consequently, a power factor (= S-2/rho) was enhanced up to 3.5 x 10(-6) W (.) cm(-1) K-.(-2) at 300 K for the sample annealed at 500degreesC in air.

引用

页码：L198 / L200

页数：3

共 12 条

[1] An oxide single crystal with high thermoelectric performance in air [J].