混合导体MAl_(0.97)Zn_(0.03)O_(3-y)(M=Eu,Eu_(0.9)Ca_(0.1))的合成与电性能

Synthesis and Electrical Properties of Mixed Conductor MAl_(0.97)Zn_(0.03)O_(3-y)(M=Eu,Eu_(0.9)Ca_(0.1))

采用固相反应法合成了具有菱方钙钛矿结构氧化物MAl0.97Zn0.03O3y(M=Eu,Eu0.9Ca0.1).电导率随氧分压的变化关系表明,在600～1 000℃范围内,EuAl0.97Zn0.03 O3-y和Eu09Ca0.1Al0.97 Zn0.03O3-y都是一个氧离子与电子空穴的混合导体.双掺杂的Eu0.9Ca0.1Al0.97Zn0.03O3-y的氧离子电导率与单掺的EuAl0.97Zn0.03O3-y相比,提高了约1.5个数量级,900℃时达到2S/m,约高于同温度下La0.9Sr0.1AlO3-y的电导率,活化能为1.25 Ev.本研究表明在EuAlO3体系可以通过优化掺杂离子的含量获得性能较好的氧离子导电材料.

The rhombohedral perovskite structural oxides MAl0.97Zn0.03O3-y（M=Eu,Eu0.9Ca0.1） were synthesized with the solid-state reaction method. From the oxygen partial pressure dependence of the electrical conductivity measured with conventional four inserted wire method, it is shown that EuAl0.97 Zn0.03O3-y and Eu0.9 Ca0.1Al0.97Zn0.03O3-y is a mixed conductor of oxide ion and electric hole at the temperature from 600℃ to 1 000℃. The oxide ion conductivity of doubly doped Eu0.9Ca0.1Al0.97 Zn0.03O3-y. increases about one and half order in magnitude which is larger than that of singly doped EuAl0.97Zn0.03O3-y. It is also slightly larger than that of La0.9gSr0.1AlO3-y. with 2S/m and activation energy 1.25eV at 900 ℃. Research work reveals that the oxide ion conductor can be obtained by optimizing the doped ion concentration of Eu0.gCa0.1Al0.97Zn0.03O3-y.