Ca_(2-x)Sm_xCo_2O_5热电材料的制备及性能  

Preparation and Properties of Thermoelectric Material Ca_(2-x)Sm_xCo_2O_5

作　　者：刘晓宇[1] 魏长平[1] 于敏娜[1] 李波[1] 

机构地区：[1]长春理工大学化学与环境工程学院,长春130022

出　　处：《硅酸盐学报》2011年第6期984-988,共5页Journal of The Chinese Ceramic Society

基　　金：中国科学技术协会"海外智力为国服务行动计划"(07064)资助项目

摘　　要：采用溶胶-凝胶法,以柠檬酸为络合剂、乙二醇为分散剂、硝酸盐为原料制备Sm3+掺杂Ca2-xSmxCo2O5粉末。前驱粉体经过常压烧结制备块体材料,在室温至600℃,研究样品的电阻率ρ、Seebeck系数S和功率因子P。结果表明:Sm3+摩尔掺量x=0.10～0.30时,与标准PDF 37-0668对比,所有X射线衍射峰一致且没有偏移;当x=0.45时,出现Sm3+的杂质衍射峰。Sm3+掺杂对材料的热电性能有较大的提高,在很大程度上降低材料的ρ、提高S,当x=0.30时,样品的电学性能最佳,在600℃时P达到最大,为1.25×10-4 W/(m.K2)。Sm3＋-doped thermoelectric powders of Ca2-xSmxCo2O5 were prepared by the citrate sol-gel method with citrate as com-plexing agent,glycol as dispersant and Ca（NO3）2.4H2O and Co（NO3）2.6H2O as reagents.Block samples were obtained by the com-pacting and sintering processes.Thermoelectric properties of Ca2-xSmxCo2O5,such as resistivity ρ,Seebeck coefficient S and power factor P were studied.Results show that when x=0.10-0.30,in contrast with the standard PDF 37-0668,all the X-ray diffraction peaks are consistent and do not shift.When x=0.45,new peaks of Sm3＋ impurities appear.Sm3＋ substitution greatly improves the ther-moelectric properties,reduces the resistivity,and enhances the Seebeck coefficient of Ca2Co2O5.The x=0.30 specimen has improved electrical properties.The highest power factor is 1.25 × 10-4 W/（m.K2） at 600 ℃ for sample Ca1.70Sm0.30Co2O5.

关 键 词：钴酸钙 热电材料 掺杂 热电性能 溶胶-凝胶法 

分 类 号：TN3[电子电信—物理电子学]