Thermoelectric characterization of NaxMx/2Ti1-x/2O2 (M = Co, Ni and Fe) polycrystalline materials

被引：5

作者：

Fujishiro, Y

Miyata, M

Awano, M

Maeda, K

机构：

[1] Natl Inst Adv Ind Sci & Technol, Synergy Mat Res Ctr, Joint Res Ctr Adv Technol, Moriyama Ku, Nagoya, Aichi 4638687, Japan

[2] Joint Res Ctr Adv Technol, Synergy Ceram Lab, Fine Ceram Res Assoc, Moriyama Ku, Nagoya, Aichi 4638687, Japan

来源：

CERAMICS INTERNATIONAL | 2002年 / 28卷 / 08期

关键词：

thermoelectric properties; NaxMx/2Ti(1-x/2); polycrystalline material;

D O I：

10.1016/S0272-8842(02)00050-0

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：

Layered alpha-titanate materials, NaxMx/2Ti1-x/2O2 (M = Co, Ni and Fe, x = 0.2-0.4), were synthesized by flux reactions, and electrical properties of polycrystalline products were measured at 300-800 degreesC. After sintering at 1250 degreesC in Ar, all products show n-type thermoelectric behavior. The values of both d.c. conductivity and Seebeck coefficient of polycrystalline Na0.4Ni0.2Ti0.8O2 were ca. 7 x 10(3) S/m and ca. -193 muV/K around 700 degreesC, respectively. The measured thermal conductivity of layered a-titanate materials has lower value than conductive oxide materials. It was ca. 1.5 Wm(-1) K-I at 800 degreesC. The estimated thermoelectric figure-of-merit, Z, of Na0.4Ni0.2Ti0.8O2 and Na0.4Co0.2Ti0.8O2 was about 1.9x10(-4) and 1.2x10(-4) K-1 around 700 degreesC, respectively. (C) 2002 Elsevier Science Ltd and Techna S.r.l. All rights reserved.

引用

页码：841 / 845

页数：5

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