采用溶胶-凝胶法制备固体电解质Ce_(0.8)Pr_(0.2-x)Sm_(x)O_(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_(0.8)Pr_(0.2-x)Sm_(x)O_(2-δ)固溶体中存在氧空位,在Ce_(0.8)Pr_(0.2-x)Sm_(x)O_(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_(0.8) Pr 0.15 Sm 0.05 O 2-δ的电导率高于单一稀土掺杂Ce_(0.83)Sm_(0.17)O_(2-δ)的电导率,且Ce_(0.8)Pr_(0.15)Sm_(0.05)O_(2-δ)的电导率最大,σ600℃为1.2×10^(-2)S/cm,这归因于样品Ce_(0.8)Pr_(0.15)Sm_(0.05)O_(2-δ)中较高的氧空位浓度和小极化子的跃迁.
The solid solutions Ce 1- x Eu x O 2- δ ( x =0\^10—0\^50) were synthesized by high temperature and high pressure. The XRD measurement showed that the solid solution was crystallized in cubic fluorite type structure and the lattice parameter increased with the content of Eu increasing up to x =0.4. The solution limit was \%ca.\% 0.4 under the condition of 3.6 GPa, 840—1 020 ℃. The XPS data showed that the Eu ions are Eu 3+ and trace of Ce 4+ ions were reduced to Ce 3+ ions during synthesis of high temperature and high pressure. The ionic conduction for Ce 0.8 Eu 0.2 O 2- δ was measured by impedance spectroscopy and it was found that the activation energy was 1.07 eV and the conductivity was 3.43×10 -5 S·cm -1 at 550 ℃.
