退火时间对铕填充式方钴矿化合物热电性能的影响

EFFECTS OF ANNEALING TIME ON THERMOELECTRIC PROPERTIES OF Eu-FILLED SKUTTERUDITE COMPOUNDS

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。

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 prol...