采用溶胶-凝胶法制备了掺杂Sr²⁺、Ni²⁺的La₂Mo₂O₉基固体电解质材料，通过扫描电镜、热重-差示扫描量热分析、X射线衍射、电化学阻抗谱等方法对样品进行测试表征。结果表明，所制备的电解质均已抑制了相变；在800℃烧结后能得到致密度高于95%的陶瓷烧结体；随着Sr²⁺、Ni²⁺掺杂量增加，氧离子导体电导率均呈现逐渐变小的趋势，σ（x=0.6） < σ（x=0.4） < σ（x=0.2）；在温度T=800℃、掺杂Sr²⁺离子摩尔比为0.2时，电导率σ[La_1.8Sr_0.2Mo₂O_8.9]=0.028 S/cm、活化能E_a=1.32 eV、电导率σ[La₂Mo_1.8Ni_0.2O_8.6]=0.034 S/cm、活化能E_a=1.08 eV，其均有望应用于中低温固体氧化物燃料电池。

Solid electrolytes La₂Mo_2-xNi_xO_9-δ,La_2-xSr_xMo₂O_9-δ (x=0.2,0.4,0.6) are synthesized by sol-gel method,and are tested by scanning electron microscopy (SEM),X-ray diffraction (XRD) and electrochemical impedance spectroscopy (EIS) and TG-DTA.The results show that the prepared electrolyte samples have inhibited phase transformation;ceramic sintered bodies with densities higher than 95% can be obtained after sintering the samples at 800℃;the conductivity of oxygen ionic conductors decreases gradually as the doping amount of Sr²⁺ and Ni²⁺ increases,σ(x=0.6) < σ(x=0.4) < σ(x=0.2).At 800℃ and the molar ratio of Sr²⁺ is 0.2,the conductivity σ[La_1.8Sr_0.2Mo₂O_8.9]=0.028 S/cm,E_a[La_1.8Sr_0.2Mo₂O_8.9]=1.32 eV,the conductivity σ[La₂Mo_1.8Ni_0.2O_8.6]=0.034 S/cm,E_a[La₂Mo_1.8Ni_0.2O_8.6]=1.08 eV.La_1.8Sr_0.2Mo₂O_8.9 and La₂Mo_1.8Ni_0.2O_8.6 are expected to show a broad application prospect in medium low temperature solid oxides fuel cell.