掺杂sc的CaZrO_3的制备及电学性能  

PREPARATION AND ELECTRICAL PROPERTIES OF Sc-DOPED CaZrO_3

作　　者：厉英[1] 丁玉石[1] 崔绍刚[1] 王常珍[1] 

机构地区：[1]东北大学材料与冶金学院,沈阳110819

出　　处：《金属学报》2012年第5期575-578,共4页Acta Metallurgica Sinica

基　　金：国家自然科学基金项目50774018和51074038;中央高校基本科研业务费专项资金项目N1 00602008资助~~

摘　　要：采用掺杂Sc_2O_3,通过固相反应法制备了CaZr_(1-x)Sc_xO_(3-α)(x=0,0.1,0.15)材料.在610-850℃采用交流阻抗谱法测定了CaZr_(1-x)Sc_xO_(3-α)的电导率及电导激活能,并对CaZrO_3掺Sc及掺In样品的电学性能进行了比较.结果表明:在610-850℃,CaZrO_3的电导率为4.3×10^(-19)-1.4×10^(-6)S/cm,CaZr_(1-x)Sc_xO_(3-α)(x=0.1,0.15)的电导率为1.16×10^(-4)-1.4×10^(-3)S/cm,CaZr_(1-x)In_xO_(3-α)(x=0.1,0.15)的电导率为0.34×10^(-4)-4.33×10^(-4)S/cm,且随着温度的升高而提高;掺杂能极大提高CaZrO_3的电导率,并随着掺杂量的增加,电导激活能降低,电导率增加;温度及掺杂量相同时,掺Sc材料电导率明显高于掺In材料,说明掺Sc对提高材料的电导率更有效.CaZrO_3 solid state electrolyte displays proton conductivity and high chemical stability. The Sc doped CaZrO_3 proton conductors were prepared by solid state reaction in order to improve the conductivity in this study.XRD analysis suggest that CaZr_（1-x）Sc_xO_（3-α）（x=0,0.1,0.15） samples were synthesized completely.The electrochemical impedance spectra were applied to study the conductivities and the activation energy for proton diffusion of the CaZr_（1-x）Sc_xO_（3-α）（x=0,0.1,0.15） in the temperature range of 610—850℃,and the electric conductivities of CaZr_（1-x）Sc_xO_（3-α） were compared with those of CaZr_（1-x）In_xO_（3-α）.The experiment results show that the electric conductivities of CaZrO_3, CaZr_（0.9）Sc_（0.1）O_（3-α）,CaZr_（0.85）Sc_（0.15）O_（3-α）,CaZr_（0.9）In_（0.1）O_（3-α） and CaZr_（0.85）In_（0.15）O_（3-α） are 4.3×10^（-19）- 1.4×10^（-6）S/cm（610-850℃）,1.16×10^（-4）-4.6×l0^（-4）S/cm（690-850℃）,1.8×10^（-4）-1.4×10^（-3） S/cm （610-850℃）,0.34×10^（-4）-4.30×10^（-4） S/cm（741-847℃） and 0.57×10^（-4）-4.33×10^（-4） S/cm（585- 814℃）,respectively.These conductivities results show that the conductivity of CaZrO_3 proton conductor can be significantly improved by doping.The conductivities of CaZrO_3 increase with the Sc doping content and temperature increasing.The results reveal that the conductivities of CaZr_（1-x）Sc_xO_（3-α） are higher than those of CaZr_（1-x）In_xO_（3-α）.Sc-doping is more beneficial for increasing the conductivity of CaZrO_3 solid state electrolyte.

关 键 词：固体电解质 质子导体 掺杂 电化学阻抗谱 电导率 

分 类 号：O646[理学—物理化学]