Ca、Zn双掺杂的SmAlO_3基氧离子导体的合成及电性能  

Synthesis and electrical properties of Ca and Zn doped SmAlO_3-based oxygen ionic conductor

作　　者：向军[1] 胥青华[1] 王晓晖[1] 

机构地区：[1]江苏科技大学数理学院,镇江212003

出　　处：《中国有色金属学报》2007年第6期958-962,共5页The Chinese Journal of Nonferrous Metals

摘　　要：采用固相反应法合成一系列样品Sm0.9Ca0.1Al1-xZnxO3-δ(x=0,0.03,0.05)。利用X射线衍射和扫描电镜研究样品的结构、微观形貌和烧结性能,用交流阻抗谱测量Sm0.9Ca0.1Al0.97Zn0.03O3-δ在500～1 000℃的电导性能。结果表明:在1 650℃烧结24 h可以获得单相样品,Zn2+在B位的固溶度为3%～5%,样品的相对密度为92.3%。Ca、Zn双掺杂能大大提高样品的电导性能,800℃时总电导率为0.39 S/m,ln(σT)与1/T关系曲线呈一折线,高温电导活化能小于低温电导活化能,710℃以上的电导活化能为0.66 eV,710℃以下的电导活化能为1.18 eV。A series of samples Sm0.9Ca0.1Al1-xZnxO3-δ（x=0, 0.03, 0.05） were synthesized by solid state reaction method. The microstructure, morphology and sinterability of the samples were characterized by X-ray diffraction and scanning electron microscope. And the alternating current impedance measurements were performed at 500-1 000 ℃. The results show that the single phase samples can be obtained when the samples are sintered at 1 650 ℃ for 24 h, and the solid solubility of Zn^2＋ on B site should be in the range of 3%-5%, and the relative density of Sm0.9Ca0.1Al0.97Zn0.03O3-δ is 92.3%. The doubly doping of Ca and Zn can improve consumedly the electrical properties of SmAlO3, and the total conductivity of Sm0.9Ca0.1Al0.97Zn0.03O3-δ is 0.39 S/m at 800 ℃. The curves of 1n（σT） against 1/T reveal two straight lines intersecting at 710 ℃. The activation energy of oxygen-vacancy motion above 710 ℃ is lower than that below 710 ℃.

关 键 词：氧离子导电性 双掺杂铝酸钐 交流阻抗谱 电导率 

分 类 号：O614.33[理学—无机化学] TM911.4[理学—化学]