Investigation of the Ionic Conductivities of Yttria-Doped Ceria and Yttria-Stabilized Zirconia by Using the Statistical Moment Method
J. Korean Phys. Soc. 2019; 75: 293~303
Published online August 30, 2019 © 2019 The Korean Physical Society.


1Tay Bac University, Son La, Vietnam
2University of Education, Vietnam National University, Hanoi, Vietnam
3Institute of Research and Development, Duy Tan University, Da Nang 550000, Vietnam, and Hanoi National University of Education, Hanoi, Vietnam
Correspondence to: Bui Duc Tinh
Abstract
We investigated the ionic conductivities of yttria-doped ceria (YDC) and yttria-stabilized zirconia (YSZ) by using the statistical moment method including the anharmonicity effects of thermal lattice vibrations. The distribution of oxygen vacancies around dopants and the important role of cation barriers on vacancy diffusion are evaluated in detail. The ionic conductivities of YDC and YSZ are calculated as functions of the dopant concentration. Our results show that the ionic conductivities increase with increasing dopant concentration and reach a maximum value at x ≈ 0.1 for YDC at T = 1073 K and at x ≈ 0.2 for YSZ at T = 873 K and 973 K, consistent with experimental observations.
PACS numbers: 63.70.+h
Keywords: Ionic conductivities, Yttria-doped ceria, Yttria-stabilized zirconia, Statistical moment method


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