掺杂Sm^(3+)对Ce_(0.84)Y_(0.16)O_(2-δ)固体电解质材料性能的影响(英文)

EFFECT OF Sm^(3+) DOPING ON PROPERTIES OF Ce_(0.84)Y_(0.16)O_(2-δ) SOLID ELECTROLYTE MATERIALS

采用固相反应法合成不同含量Sm3+的CeO2基粉料Ce0.84Y0.16-xSmxO2-δ(x=0,0.02,0.04和0.06)并在1600℃烧成制备了电解质材料。采用X射线衍射,膨胀测量法和交流阻抗谱测试电解质材料的晶体结构、热膨胀和离子电导率。结果表明:所有电解质材料样品均为单一的萤石结构。在400～800℃范围内,与单掺杂Y3+的样品相比,Sm3+和Y3+共掺的样品Ce0.84Y0.16-xSmxO2-δ(x=0.02,0.04和0.06)都显示了较高的离子电导率。当x=0.02时,样品的离子电导值达到最大值。同时还发现所有样品的热膨胀均随温度的升高而线性增长。

Ceria-based electrolyte materials Ce0.84Y0.16-xSmxO2-δ（x = 0,0.02,0.04 and 0.06） were prepared by powder prepared solid re-a ction synthesis method and sintering at 1 600 ℃.Their crystal structures,thermal expansions and ionic conductivities were characterized by X-ray diffraction,dilatometry and alternating current（AC） impedance spectroscopy,respectively.The results show that all the samples have single fluorite structures after sintered at 1 600 ℃.In comparison with the singly Y3＋-doped ceria,the co-doped ceria electrolyte materials of Ce0.84Y0.16-xSmxO2-δ,where x = 0.02,0.04 and 0.06,have higher conductivities at 400-800 ℃.The conductivity of Ce0.84·Y0.16-xSmxO2-δ where x = 0.02 is the highest.The thermal expansion increases linearly with the increase of temperature for all the samples.