Mechanisms of conductivity ceiling in YSZ |
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| Institution: | 1. Graduate School of Natural Science and Technology, Okayama University, Tsushimanaka 3-1-1, Okayama 700-8350, Japan;2. Faculty of Engineering, Tokyo Polytechnic University, Kanagawa 243-0297, Japan;1. Department of Physics, Pusan National University, Busan 609-735, Republic of Korea;2. Busan Center, Korea Basic Science Institute, Busan 618-230, Republic of Korea;1. Institute of Physical Chemistry, University of Innsbruck, Innrain 80-82, A-6020, Innsbruck, Austria;2. University Service Centre for Transmission Electron Microscopy (USTEM), Vienna, University of Technology, Wiedner Hauptstrasse 8-10/052, A-1040, Vienna, Austria |
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| Abstract: | The conductivity ceiling phenomena of O2− ions in stabilized zirconia are studied in terms of the path probability method and Monte Carlo simulation. It is shown that there exist two kinds of possible mechanisms. One of them is due to an order–disorder transition of O2− ions, which is caused by the repulsive interaction between O2− ions, and the other is owing to a percolation transition of dopant cations network. It is proposed that the YSZ case originates in the percolation transition. |
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