| 电流驰豫法测试氧化镧掺杂的氧化铈中氧离子迁移 |
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| 引用本文： | 李天君,张梦霏,刘广华,潘伟. 电流驰豫法测试氧化镧掺杂的氧化铈中氧离子迁移[J]. 稀有金属材料与工程, 2020, 49(2): 505-509 |
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| 作者姓名： | 李天君 张梦霏 刘广华 潘伟 |
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| 作者单位： | 清华大学 新型陶瓷与精细工艺国家重点实验室,清华大学 新型陶瓷与精细工艺国家重点实验室,清华大学 新型陶瓷与精细工艺国家重点实验室,清华大学 新型陶瓷与精细工艺国家重点实验室 |
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| 基金项目： | 国家自然科学基金资助(项目号51323001) |
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| 摘 要： | 采用甘氨酸-硝酸盐法(GNP)合成了Ce0.65La0.35O1.825(LDC)粉末,在1400℃下烧结10 h得到陶瓷试样,用XRD和SEM表征了样品的物相和表面形貌。用直流电场测试了试样在不同温度下的电流驰豫现象,并计算了不同温度下试样中迁移氧离子数目和材料直流电导率。结果表明,在固态电解质材料中突然施加强电场,可迁移离子基本都发生了位置偏移,但极少部分可以产生长程迁移。随着温度的升高,样品中发生迁移的氧离子数目增加,但都远小于氧空位总量。迁移氧离子数目与温度之间满足阿累尼乌斯公式,其迁移活化能为0.83 eV。
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| 关 键 词： | 氧化镧掺杂氧化铈 电流驰豫法 氧离子迁移 电导率 |
| 收稿时间： | 2019-04-22 |
| 修稿时间： | 2019-05-10 |
Investigation of ion transportiation using the method of current relaxation |
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| Tianjun Li,Mengfei Zhang,Guanghua Liu and Wei Pan. Investigation of ion transportiation using the method of current relaxation[J]. Rare Metal Materials and Engineering, 2020, 49(2): 505-509 |
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| Authors: | Tianjun Li Mengfei Zhang Guanghua Liu Wei Pan |
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| Affiliation: | Tsinghua University,School of Material Science Engineering,State Key Lab of Advance Ceramics Fine Processing,Tsinghua University,School of Material Science Engineering,State Key Lab of Advance Ceramics Fine Processing,Tsinghua University,School of Material Science Engineering,State Key Lab of Advance Ceramics Fine Processing,Tsinghua University,School of Material Science Engineering,State Key Lab of Advance Ceramics Fine Processing |
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| Abstract: | Glycine-nitrate process(GNP) was used to synthesize Ce0.65La0.35O1.825(LDC) powders.The samples were obtained by sintering at 1400℃ for 10 h.The phase composition and morphology were characterized by XRD and SEM.We measured the current change with time of specimen at different temperatures and thus calculated the transferred number of ions and the DC conductivity.Result shows that almost all the mobile ions will shift around their positions,but only tiny portion can migrate for a few lattice length.The number of transferred ions increases with increasing temperature,but it is smaller than the total number of oxygen vacancies.The transferred ion number and temperature follows the Arrhenius relationship with the activation energy of 0.83 eV. |
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| Keywords: | lanthanum doped ceria current relaxation migration of oxygen ions conductivity |
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