摘要
研究了以Co,Sb,Fe及稀土Ce,La为起始原料,采用固相反应放电等离子烧结(SPS)技术合成二元稀土填充式Skutterudite化合物(Ce,La)yFexCo4-xSb12(x=1.0,y=0～0.3),并对化合物的热电性能进行了研究。实验结果表明:在y=0～0.3组成范围内,采用固相反应SPS法在900～1000K温度范围内合成了(Ce,La)yFexCo4-xSb12化合物,并伴有极少量的Sb相。(Ce,La)yFexCo4-xSb12化合物呈现p型传导,化合物的晶格常数和Seebeck系数随Ce,La复合填充分数y的增加而增加,电导率和热导率由于Ce,La的复合填充大幅度降低,并且随着填充分数的增加进一步降低。当Ce,La复合填充分数为0.3时热导率达到最小值。在773K,富Co组成Ce0.1La0.2FeCo3Sb12化合物的最大无量纲热电性能指数ZTmax达0.46。
The filled Skutterudite compounds (Ce, La)_yFe_xCo_(4-x)Sb_(12) with x=1.0 and y=0～0.3 were synthesized by solid state reaction and Spark Plasma Sintering (SPS) using powders of Co, Sb, Fe and rare earth Ce, La as starting materials. The thermoelectric properties of the compounds were also studied. It is shown that the almost single phase Skutterudite compounds (Ce, La)_yFe_xCo_(4-x)Sb_(12) are synthesized at (900～)1000 K and all samples show p-type. The lattice constant and the Seebeck coefficient of the compounds increases with the filling fraction of the Ce and La, but the thermal conductivity and electrical conductivity is reduced greatly with the filling of Ce and La. The thermal conductivity of the samples with y=0.3 present a minimum. The compound Ce_(0.1)La_(0.2)FeCo_3Sb_(12) with Co-rich has a maximum of the dimensionless figure of merit ZT=0.46 at 773 K.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2005年第2期129-132,共4页
Journal of the Chinese Society of Rare Earths
基金
国家自然科学基金(50271001)
北京市教委科技发展重点资助项目(KZ200310005001)
