李天君,张梦霏,刘广华,潘伟.电流驰豫法测试氧化镧掺杂氧化铈中氧离子迁移[J].稀有金属材料与工程,2020,49(2):505~509.[Tianjun Li,Mengfei Zhang,Guanghua Liu,Wei Pan.Investigation of ion transportiation using the method of current relaxation[J].Rare Metal Materials and Engineering,2020,49(2):505~509.]
电流驰豫法测试氧化镧掺杂氧化铈中氧离子迁移
投稿时间:2019-04-22  修订日期:2019-05-10
中文关键词:  氧化镧掺杂氧化铈  电流驰豫法  氧离子迁移  电导率
基金项目:国家自然科学基金资助(项目号51323001)
中文摘要:
      本文采用甘氨酸-硝酸盐法(GNP)合成了Ce0.65La0.35O1.825 (LDC)粉末,在1400℃下烧结10小时得到陶瓷试样,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。
Investigation of ion transportiation using the method of current relaxation
英文关键词:lanthanum doped ceria  current relaxation  migration of oxygen ions  conductivity
英文摘要:
      glycine-nitrate process (GNP) was used to synthesis Ce0.65La0.35O1.825 (LDC) powders. The samples were obtained by sintering for 10 h at 1400 ℃. 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. Almost all the mobile ions will shift around their positions, but only tiny portion can migrate through a few lattice length. The number of transferred ions increased with temperature, but far smaller than the total number of oxygen vacancies. The transferred ion number and temperature follows Arrhenius relationship with the activation energy of 0.83 eV.
作者单位E-mail
李天君 清华大学 新型陶瓷与精细工艺国家重点实验室 litianjun737@sina.com 
张梦霏 清华大学 新型陶瓷与精细工艺国家重点实验室  
刘广华 清华大学 新型陶瓷与精细工艺国家重点实验室  
潘伟 清华大学 新型陶瓷与精细工艺国家重点实验室  
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