Ca2.7Sr0.3Co4O9 和 Ca0.95Sm0.05MnO3 热电材料的性能及器件(英文)  

PROPERTIES AND DEVICE OF Ca_(2.7)Sr_(0.3)Co_4O_9 AND Ca_(0.95)Sm_(0.05)MnO_3 THERMOELECTRIC MATERIALS

作　　者：许洁[1] 魏长平[1] 贾坤[1] 

机构地区：[1]长春理工大学材料科学与工程学院,长春130022

出　　处：《硅酸盐学报》2010年第6期1135-1139,共5页Journal of The Chinese Ceramic Society

基　　金：中国科协海外智力为国服务行动计划(08068);吉林省教育厅十一五科学技术研究(2009JY707)资助项目

摘　　要：为了构造具有一定实用性能的氧化物热电器件,对 p 型 Ca3Co4O9和 n 型 CaMnO3过渡金属氧化物半导体进行研究,结果表明:Ca2.7Sr0.3Co4O9和 Ca0.95Sm0.05MnO3的热电性能良好。Ca2.7Sr0.3Co4O9陶瓷的微观形貌呈片层状及尖锐的(00?)相,说明具有高度织构,Ca0.95Sm0.05MnO3陶瓷为单一相正交晶系。分析了样品形成的化学反应过程。热电参数测试结果表明:Ca2.7Sr0.3Co4O9为 p 型半导体,空穴导电机制,Ca0.95Sm0.05MnO3为 n 型半导体,电子导电机制。两种材料的电阻均较低,在 870 K,Seebeck 系数分别为 170 μV/K 和–167 μV/K。在测量温度范围内,热导率变化很小,并计算出热电优值。利用此两种材料构造热电器件,并对其性能进行测试。As part of the challenge to fabricate oxide thermoelectric devices,p-type Ca3Co4O9 and n-type CaMnO3 transition metal oxide semiconductors were investigated. Ca2.7Sr0.3Co4O9 and Ca0.95Sm0.05MnO3 show excellent thermoelectric performance. The tex-tured Ca2.7Sr0.3Co4O9 exhibits lamellar structure and strong peaks are indexed as （00？）. Ca0.95Sm0.05MnO3 is a single phase with or-thorhombic symmetry. The chemical reactions used to synthesize them were analyzed. The results indicate that Ca2.7Sr0.3Co4O9 is a p-type semiconductor,with holes conduction mechanism. Ca0.95Sm0.05MnO3 is confirmed to be an n-type semiconductor,where the dominant current carriers are electrons. The electrical resistivity of both materials are small and the values of Seebeck coefficient are 170 μV/K and –167 μV/K for Ca2.7Sr0.3Co4O9 and Ca0.95Sm0.05MnO3,respectively. The thermal conductivity of both samples varies within narrow limits over the entire temperature range,and the thermoelectric figure （ZT） of merit has been calculated. A thermoelec-tric device based on this research was fabricated and the device＇s performance was tested.

关 键 词：氧化物 热电材料 热电性能 器件 

分 类 号：O482.6[理学—固体物理] TN37[理学—物理]