摘要
用高温固相反应法合成了非化学计量组成的Ba1.03Ce0.8Sm0.2O3-α,Ba0.98Ce0.8Sm0.2O3-α固体电解质样品,作为比较,亦用高温固相反应法合成了化学计量组成的BaCe0.8Sm0.2O3-α固体电解质样品。用X射线衍射法对它们进行了晶体结构测定,分别用氢及氧浓差电池方法研究了它们在600～1000℃下的质子和氧离子导电特性。实验结果表明,这些样品均为钙钛矿型斜方晶单相结构,随着样品中的Ba2+离子含量的增多,样品的质子迁移数增大。这些样品在氧气氛中均为氧离子与电子空穴的混合导体,样品的Ba2+离子含量对样品的氧离子迁移数无明显影响。
Ba1.03Ce0.8Sm0.2O3-α and Ba0.98Ce0.8Sm0.2O3-α solid electrolytes with nonstoichiometric composition were synthesized for the first time by high temperature solidstate reaction. For comparison, BaCe0.8Sm0.2O3-α solid electrolyte with stoichiometric composition was also synthesized by high temperature solidstate reaction. Their crystal structures were determined by Xray diffraction. The protonic and oxideionic conduction in the samples were investigated in the temperature range of 600～1000 ℃ by means of hydrogen and oxygen concentration cells, respectively. The samples are all of a singlephase structure of perovskitetype orthorhombic system. The proton transport numbers increase with the increasing Ba2+ion content of the samples. The samples are all a mixed conductors of oxideion and electron hole under oxygen atmosphere, and the oxideionic transport numbers are not obviously affected by the Ba2+ion content of the samples.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2003年第2期236-240,共5页
Journal of the Chinese Society of Rare Earths
基金
国家自然科学基金资助项目(20171034)
江苏省教育厅自然科学指导性课题(01KJD150003)
