【摘要】 采用溶胶-凝胶法制备固体电解质Ce_0.8Pr_0.2-xSm_xO_2-δ（x=0.02,0.05,0.10）.XRD结果表明:800℃煅烧后的全部样品皆为单一的立方萤石型结构,平均晶粒尺寸为19～28 nm;Raman光谱结果表明:立方萤石结构的Ce_0.8Pr_0.2-xSm_xO_2-δ固溶体中存在氧空位,在Ce_0.8Pr_0.2-xSm_xO_2-δ中掺入钐可提高氧空位浓度;阻抗谱测试表明:稀土双掺杂Ce_0.8Pr_0.15Sm_0.05O_2-δ的电导率高于单一稀土掺杂Ce_0.83Sm_0.17O_2-δ的电导率,且Ce_0.8Pr_0.15Sm_0.05O_2-δ的电导率最大,σ_600℃为1.2×10^-2S/cm,这归因于样品Ce_0.8Pr_0.15Sm_0.05O_2-δ中较高的氧空位浓度和小极化子的跃迁.更多还原

【Abstract】 Ce_0.8Pr_0.2-xSm_xO_2-δ（x=0.02,0.05,0.10） solid electrolytes were produced by the sol-gel mechanics.XRD consequence proves that entire specimens sintered at 800℃ are formed in an exclusive cubic fluorite structure.The representative grain sizes are 19～28 nm.The Raman spectra shows that there are oxygen vacancies in the solid solution Ce_0.8Pr_0.2-xSm_xO_2-δwith cubic fluorite structure.The oxygen vacancy concentration is increased by adding Sm in Ce_0.8Pr_0.2-xSm_xO_2-δ．Impedance spectra proves that the conductivity of rare earth codoped ceria Ce_0.8Pr_0.15Sm_0.05O_2-δis higher than that of unitary rare earth doped ceria Ce_0.83Sm_0.17O_2-δ．Ce_0.8Pr_0.15Sm_0.05O_2-δhave maximum conductivity，σ_600℃=1.2×10^-2S/cm,which is assigned to the higher oxygen vacancy concentration and the hopping electron transition of micro polarons in the specimen Ce_0.8Pr_0.15Sm_0.05O_2-δ.更多还原