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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(英文),2020,49(2):505~509.[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.]
Investigation of ion transportiation using the method of current relaxation
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Received:April 22, 2019  Revised:May 10, 2019
DOI:
Key words: lanthanum doped ceria  current relaxation  migration of oxygen ions  conductivity
Foundation item:国家自然科学基金资助(项目号51323001)
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Tianjun Li,Mengfei Zhang,Guanghua Liu and Wei Pan  
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Abstract:
      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.