| Ba0.9La0.1Ce0.7Zr0.2Nd0.1O3-α陶瓷的化学稳定性和离子导电性 |
| Chemical Stability and Ionic Conduction of Ba0.9La0.1Ce0.7Zr0.2Nd0.1O3-α Ceramic |
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| 摘要: 用高温固相反应法制备了Ba0.9La0.1Ce0.7Zr0.2Nd0.1O3-α陶瓷。粉末X-射线衍射(XRD)结果表明，该材料为单一钙钛矿型BaCeO3斜方晶结构，在高温下、CO2或水蒸气气氛中具有较高的稳定性。在500~900 ℃温度范围内，分别用交流阻抗谱技术和气体浓差电池方法研究了材料在不同气体气氛中的离子导电特性，并与Ba0.9Ca0.1Ce0.9Nd0.1O3-α材料的导电特性进行了比较。结果表明，在500~900 ℃温度范围内，干燥和湿润的氢气、氮气、空气和氧气气氛中，材料的电导率均随着温度升高和氧分压增加而增加，且材料在湿润气氛中的电导率稍高于相应的干燥气氛中的电导率(氢气气氛中则相反)。在湿润氢气中，材料的质子迁移数为1，是一个纯的质子导体；在干燥空气中，材料的氧离子迁移数为0.087~0.155，是一个氧离子与电子空穴的混合导体；在湿润空气中，材料的质子迁移数为0.001~0.004，氧离子迁移数为0.160~0.198，是一个质子、氧离子和电子空穴的混合导体。材料在干燥和湿润空气中的氧离子电导率均高于相同条件下Ba0.9Ca0.1Ce0.9Nd0.1O3-α材料的氧离子电导率。 |
| 关键词: Ba0.9La0.1Ce0.7Zr0.2Nd0.1O3-α 化学稳定性 质子导电性 阻抗谱 气体浓差电池 |
| 基金项目: |
| Abstract: Ba0.9La0.1Ce0.7Zr0.2Nd0.1O3-α ceramic was prepared by high temperature solid state reaction. X-ray powder diffraction pattern (XRD) shows that the material is of a single orthorhombic phase of perovskite-type BaCeO3 and good stability in CO2 or water steam atmosphere at the high temperature. Ionic conduction of the material in different gases was studied by using ac impendence spectroscopy and gas concentration cell methods in the temperature range of 500~900 ℃, respectively. The results indicate that the conductivity of the material in the different gases is increased as the temperature rises and oxygen partial pressure increases. The conductivity of the material in wet nitrogen, air or oxygen is slightly higher than that in corresponding dry gas, but it is contrary in hydrogen. In wet hydrogen, the proton transport numbers are 1, and the material is a pure proton conductor. In dry air, the oxide-ionic transport numbers are 0.087~0.155, and the material is a mixed conductor of oxide-ion and electronic hole. In wet air, the protonic transport numbers are 0.001~0.004, the oxide-ionic transport numbers are 0.160~0.198, and the material is a mixed conductor of proton, oxide-ion and electronic hole. Under the same conditions, the oxide-ionic conductivity of the material in dry air or in wet air is higher than that of Ba0.9Ca0.1Ce0.9Nd0.1O3-α. |
| Keywords: Ba0.9La0.1Ce0.7Zr0.2Nd0.1O3-α chemical stability proton conduction impedance spectroscopy gas concentration cell |
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| 摘要点击次数: 1760 |
| 全文下载次数: 1983 |
| 仇立干,王茂元,曹 旭.Ba0.9La0.1Ce0.7Zr0.2Nd0.1O3-α陶瓷的化学稳定性和离子导电性[J].无机化学学报,2011,27(1):145-151. |
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