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用固相反应法制备了具有正交钙钛矿结构的固体电解质SmAl1-xZnxO3-δ(x=0,0.03,0.05,0.1)。采用四引线法对样品的电导率与温度和氧分压的关系进行了测量。结果表明:通过掺杂,样品的电导率显著提高,掺杂样品的电导率比未掺杂的SmAlO3提高了3~4个数量级。在测量温度973~1273 K范围内,SmAl0.95Zn0.05O3-δ是一个氧离子和电子空穴的混合导体,但以离子导电为主。随着温度的下降,由于P型电导的减弱,样品中的氧离子迁移数逐渐增加。在所有样品中,SmAl0.95Zn0.05O3-δ的电导率最高,800℃时为0.35 S.m-1,活化能为0.43 eV。
The solid electrolyte SmAl1-xZnxO3-δ (x = 0,0.03,0.05,0.1) with orthorhombic perovskite structure was prepared by solid-state reaction. The four-lead method was used to measure the conductivity of the sample in relation to temperature and partial pressure of oxygen. The results show that the electrical conductivity of the samples increases by more than 3 to 4 orders of magnitude compared with that of undoped SmAlO3. In the range of 973 ~ 1273 K, SmAl0.95Zn0.05O3-δ is a mixed conductor of oxygen and electron holes, but mainly ion conduction. As the temperature decreases, the number of oxygen ions in the sample gradually increases due to the weakening of the P-type conductance. Among all the samples, SmAl0.95Zn0.05O3-δ had the highest conductivity of 0.35 S.m-1 at 800 ℃ and an activation energy of 0.43 eV.