| BaCe0.7Zr0.2La0.1O3-α陶瓷的制备和导电性 |
| Preparation and Electrical Conductivity of BaCe0.7Zr0.2La0.1O3-α Ceramic |
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| 摘要: 以高温固相反应法合成了BaCe0.7Zr0.2La0.1O3-α陶瓷。粉末XRD结果表明,该陶瓷材料为单一钙钛矿型BaCeO3斜方晶结构。以陶瓷材料为固体电解质、多孔性铂为电极,采用交流阻抗谱技术和气体浓差电池方法分别测定了材料在500～900℃下,干燥空气、湿润空气和湿润氢气中的电导率以及离子迁移数,研究了材料的离子导电特性。结果表明,在500～900℃下干燥空气中,陶瓷材料的最大电导率为1.8mS·cm-1,氧离子迁移数为0.14～0.04,是一个氧离子与电子空穴的混合导体。在湿润空气中,陶瓷材料的最大电导率为2.0mS·cm-1,质子迁移数为0.48～0,氧离子迁移数为0.25～0.10,是质子、氧离子和电子空穴的混合导体。在湿润氢气中,陶瓷材料的最大电导率为3.6mS·cm-1。在500～700℃温度范围内,陶瓷材料的质子迁移数为1,是纯的质子导体;而在800～900℃温度范围内,陶瓷材料的质子迁移数为0.93～0.91,是质子与电子的混合导体,质子电导占主导。 |
| 关键词: BaCe0.7Zr0.2La0.1O3-α 阻抗谱 气体浓差电池 离子导电性 |
| 基金项目: 国家自然科学基金资助项目(No.20771079);江苏省高校自然科学基金资助项目(No.07KJB150126) |
| Abstract: BaCe0.7Zr0.2La0.1O3-α ceramic was prepared by high-temperature solid state reaction.X-ray powder diffraction pattern shows that the ceramic is of a single orthorhombic phase of perovskite-type BaCeO3.Using the ceramic as solid electrolyte and porous platinum as electrodes,the measurements of conductivities and ionic transport numbers on BaCe0.7Zr0.2La0.1O3-α ceramic were performed by using ac impedaence spectroscopy and gas concentration cell methods in the temperature range of 500~900℃ in dry air,wet air and wet hydrogen, respectively.The results indicate that the material is a mixed conductor of oxide-ions and electronic holes with the maximal conductivity of 1.8 mS·cm-1 and the oxide-ionic transport numbers of 0.14~0.04 in dry air.In wet air,the material has the maximal conductivity of 2.0 mS·cm-1.The protonic transport number is 0.48~0,the oxide-ionic transport number is 0.25~0.10,and the material is a mixed conductor of protons,oxide-ions and electronic holes.In wet hydrogen atmosphere,the material has the maximal conductivity of 3.6 mS·cm-1.The protonic transport number is unity and the material is a pure protonic conductor from 500 to 700℃.But in the temperature range of 800~900℃,the material exhibits a mixed conduction of protons and electrons with the protonic transport numbers of 0.93~0.91. |
| Keywords: BaCe0.7Zr0.2La0.1O3-α impedance spectroscopy gas concentration cell ionic conduction |
| 投稿时间：2007-09-24 修订日期：2007-12-17 |
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| 王茂元,仇立干,马桂林.BaCe0.7Zr0.2La0.1O3-α陶瓷的制备和导电性[J].无机化学学报,2008,24(3):357-362. |
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