Yb掺杂对热电化合物Ca_(3-x)Yb_xCo_4O_(9+δ)电性能的影响  

Effect of Doping Yb on Thermoelectric Properties of Ca_(3-x)Yb_xCo_4O_(9+δ)

作　　者：褚颖[1] 王忠[1] 蒋利军[1] 

机构地区：[1]北京有色金属研究总院能源材料与技术研究院,北京100088

出　　处：《稀有金属》2010年第2期227-230,共4页Chinese Journal of Rare Metals

基　　金：民口配套项目(JPPT-115-287)资助

摘　　要：采用溶胶凝胶法合成Ca3-xYbxCo4O9+δ(x=0,0.15,0.30,0.45)化合物粉体,以粉体为原料结合放电等离子烧结(SparkPlasmaSinte-ring,SPS)制备出致密的块体材料。研究了Yb掺杂对热电化合物电传输特性的影响。结果表明:在300～850K温度范围内,每个样品的See-beck系数又随着温度的升高而单调增大,而Yb取代Ca可使材料的电阻率(ρ)和Seebeck系数同时增加,这是因为三价的Yb3+取代二价的Ca2+将使化合物的载流子浓度降低,当x=0.30时,材料的功率因子最佳,850K时达到0.32×10-3W.K-.2m-1。The powder of Ca3-xYbxCo4O9+δ(x=0,0.15,0.30,0.45)was synthesized by using sol-gel process and bulk samples were prepared by SPS sintering.The electric transmission properties were carefully studied from 300 to 850 K.The results indicated that the Seebeck coefficient of each sample increased with increasing temperature.The substitution of Yb3+ for Ca2+ resulted in the increase of both Seebeck coefficient and electric resistivity,which could be attributed to the decrease of carrier concentration.When x=0.3,th...

关 键 词：Yb掺杂 热电化合物 SEEBECK系数 

分 类 号：O482.4[理学—固体物理]