采用固相反应法合成了具有正交钙钛矿结构的氧离子导电材料CaTi0.9Sc0.1O3-α,并通过XRD、交流复阻抗以及组装氢-氧燃料单电池等电化学方法对样品的结构、电导性能进行了表征.阻抗谱测量结果表明,在已知的CaTiO3基氧化物中,CaTi0.9Sc0.1O3-α具有最高的电导率,与同温度下8YSZ的电导率相当.从电导率随氧分压的变化关系分析表明,CaTi0.9Sc0.1O3-α在高氧分压下是一个离子与电子空穴的混合导体,而在低氧分压下则是一个离子与电子的混合导体,在中氧分压范围内几乎为一个纯氧离子导体.在燃料电池条件下,CaTi09Sc0.1O3-α比其它离子掺杂的CaTiO3基固熔体具有更宽的离子导电区域和更高的离子迁移数,在873～1 273 K范围内,样品的离子迁移数都大于0.7,并随温度升高而逐渐增加.
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