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退火时间对铕填充式方钴矿化合物热电性能的影响
作者:万俊霞 赵雪盈 李小亚 季诚昌 陈立东  
单位:东华大学材料科学与工程学院 中国科学院上海硅酸盐研究所 高性能陶瓷和超微结构国家重点实验室  
关键词:  方钴矿  热电性能  退火时间 
分类号:TB34
出版年,卷(期):页码:2009,37(3):363-366
DOI:
摘要:

采用熔融法结合放电等离子烧结技术制备了Eu填充式方钴矿化合物EuyCo4Sb12,研究了退火时间对Eu填充量及化合物热电性能的影响。采用X射线衍射和电子探针表征了化合物的相组成及成分。在300~850K,测试了化合物的电导率、热导率和Seebeck系数,结果表明:随着退火时间的延长,Eu在Co4Sb12中的填充量增加,电导率增加,晶格热导率降低,Seebeck系数降低;当退火时间为96h时,Eu填充量达到0.43,与名义组分相同经168h退火所得化合物的Eu填充量相近。

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Filled skutterudite EuyCo4Sb12 compounds were synthesized by the melting and spark plasma sintering.The effects of an-nealing time on the filling fraction of Eu and thermoelectric properties of EuyCo4Sb12 were investigated.The constituent phases and chemical composition of samples were determined by X-ray diffraction and electron probe microanalysis.In the temperature range of 300-850 K,the electrical conductivity,Seebeck coefficient and thermal conductivity were measured.The results show that with the prolongation of annealing time,both the filling fraction of Eu and electrical conductivity increase,and both the Seebeck coefficient and lattice thermal conductivity decrease.When the annealing time reaches 96 h,the filling fraction of Eu is up to 0.43,similar to the filling fraction of the reported compound with the same nominal composition annealed for 168 h.

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基金项目:
国家自然科学基金(50702070);; 国家“973”计划(2007CB607502);; 国家“863”计划(2007AA03Z233)资助项目
作者简介:
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参考文献:

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