掺杂Ce基Ce_(0.8)Sm_xY_(0.2-x)O_(1.9)(0≤x≤0.2)电解质的电性能

Electrical properties of co-doped ceria electrolyte Ce_(0.8)Sm_xY_(0.2-x)O_(1.9)(0≤x≤0.2)

采用固相反应法制备Ce0.8SmxY0.2-xO1.9Zn0.01(0≤x≤0.2)电解质试样。着重考察不同掺杂配比对材料整体导电性能的影响,另外ZnO对材料电性能的影响也进行了探讨。采用X线衍射(XRD)、Archimede排水法、热膨胀测量法和交流阻抗分析对试样的性能进行表征。结果表明:Sm和Y共掺杂能提高CeO2基电解质的电性能。其中1 550℃烧结的Ce0.8Sm0.18Y0.02O1.9在300～700℃具有最高的离子电导率。添加ZnO可以有效地降低烧结温度,在1 500℃所有试样均烧结致密。ZnO的加入可以提高材料的晶界电性能。

Samples of Ce0.8SmxY0.2-xO1.9ZnO0.01（0≤x≤0.2） were synthesized by solid reaction process.The effect of dopant content to the total electrical conductivity of materials and the role of ZnO were investigated.The samples were characterized by X-ray diffractometer,Archimed method,thermal expansion measurement,and AC impedance analysis.Results showed the co-doping of Sm and Y could improve the electrical conductivity of ceria-based electrolyte.The highest ionic conductivity during 300-700 ℃ was obtained when Ce0.8Sm0.18Y0.02O1.9 was sintered at 1 550 ℃.The addition of small amounts of ZnO could lower the sintering temperature and all of the samples were densified at 1 450 ℃.The addition of ZnO could improve the grain boundary conductivity.