Synthesis and thermoelectric properties of (NaxCa1-x)Co4O9 ceramics

被引：53
作者：
Nan, J
Wu, J
Deng, Y
Nan, CW [1 ]
机构：
[1] Tsinghua Univ, Dept Mat Sci & Engn, Beijing 100084, Peoples R China
[2] Wuhan Univ Technol, Adv Mat Res Inst, Wuhan 430070, Peoples R China
来源：
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY | 2003年 / 23卷 / 06期
基金：
中国国家自然科学基金;
关键词：
electrical conductivity; (Na; Ca)(3)Co4O9; sol-gel processes; thermal conductivity; thermoelectric properties;
D O I：
10.1016/S0955-2219(02)00202-9
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：
(NaxCa1-x)(3)Co4O9 (x=0.05-0.2) ceramics with a layered crystal structure were prepared by a sol-gel method followed by a low-temperature sintering procedure. The electrical conductivity and Seebeck coefficient of the complex oxide ceramics were measured from 400 to 900 degreesC. Their electrical conductivity and power factor increase with increasing temperature, while the thermal conductivity is very weakly dependant on the temperature. Na dopant amount has a remarkable effect on electrical and thermal transport properties. The figure of merit in the ceramic samples is smaller than that of traditional thermoelectric alloys. (C) 2002 Elsevier Science Ltd. All rights reserved.
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页码：859 / 863
页数：5
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