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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)。
Abstract：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.
[1]BENNETT G L.CRC Handbook of Thermoelectrics[M].New York:CRC Press,1955:2-5.
[2]MANEEWAN S,KHEDARI J,ZEGHMATI B,et al.Investigation ongenerated power of thermoelectric roof solar collector[J].Renew Energy,2004,29:743-752.
[3]ENRIGUE Macia.May quasicrystals be good thermoelectric materials[J].Appl Phys Lett,2000,77(20):3045-3047.
[4]邢学玲,闵新民,张文芹.钴酸盐类氧化物热电材料的研究进展[J].材料导报,2006,2:47-49.XING Xueling,MIN Xinmin,ZHANG Wenqin.Mater Rev(in Chi-nese),2006,2:47-49.
[5]MASASHI Mikami,RYOJI Funahashi.The effect of element substitu-tion on high-temperature thermoelectric properties of Ca3Co2O6 com-pounds[J].J Solid State Chem,2005,178:1670-1674.
[6]THINAHARAN C,ASWAL D K,SINGH A,et al.Growth and mor-phology of the single crystals of thermoelectric oxide material NaxCoO2[J].Cryst Res Technol,2004,39(7):572-576.
[7]张艳峰,张久兴,路清梅,等.柠檬酸溶胶-凝胶法制备Ca3Co4O9粉体及结构表征[J].功能材料,2005,36(4):597-599.ZHANG Yanfeng,ZHANG Jiuxing,LU Qingmei,et al.J Funct Mater(in Chinese),2005,36(4):597-599.
[8]MASSET A C,MICHEL C,MAIGNAN A.Misfit-layered cobaltitewith an anisotropic giant magneto-resistance:Ca3Co4O9[J].Phys RevB,2000,62(1):166-174.
[9]LIU P S,PEI J,CHEN G,et al.Preparation and characterization of thenew oxides Ca2-xNaxCo2O5[J].Physica B,2008(403):1808-1812.
[10]张艳峰,张久兴.放电等离子烧结制备Ca2Co2O5陶瓷过程中Co价态分析[J].河北师范大学学报(自然科学版),2006(30):563-566.ZHANG Yanfeng,ZHANG Jiuxing.J Hebei Normal Univ(Nat SciEd),2006,(30):563-566.
[11]WANG Y,SUI Y,CHENG J G.High temperature transport and ther-moelectric properties of Ag-substituted Ca3Co4O9+δsystem[J].J Al-loys Compd,2008,448:1-5.
[12]马秋花,赵昆渝,李智东,等.热电材料综述[J].电工材料,2004(1):43-47.MA Qiuhua,ZHAO Kunyu,LI Zhidong,et al.Electr Eng Alloy(inChinese),2004(1):43-47.
基本信息:
DOI：10.14062/j.issn.0454-5648.2011.06.003
中图分类号:O482.6
引用信息:
[1]刘晓宇,魏长平,于敏娜,等.Ca_(2-x)Sm_xCo_2O_5热电材料的制备及性能[J].硅酸盐学报,2011,39(06):984-988.DOI:10.14062/j.issn.0454-5648.2011.06.003.
基金信息:
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
2011-06-15
2011-06-15