Improvement of Electrical Conductivity in Fluorite Related Y2O3 and Fluorite CeO2 Systems Based on A Unique Effective Index |
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| Authors: | Mori T. Ikegami T. Yamamura H. Atake T. |
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| Affiliation: | (1) First Research Group, National Institute for Research in Inorganic Materials, 1-1, Namiki Tsukuba, Ibaraki 305-0044, Japan;(2) Faculty of Engineering, Kanagawa University, 3-27-1, Rokkakubashi, Kanagawa 221-8686, Japan;(3) Materials and Structure Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta-cho Midori-ku, Yokohama 226-8503, Japan |
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| Abstract: | Y2O3 has a crystal structure of c-type rare-earth oxide. Y2O3 does not show an oxide ionic conductivity. On the other hand, CeO2 based oxide is one of the most interesting of the fluorite oxides since the ionic conductivity of it is higher than that of yttria-stabilized zirconia. However, CeO2 based oxides are partially reduced and develop electronic conductivity under reduced atmosphere.In this study, the effective index for the improvement of ionic conductivity in Y2O3 and CeO2 systems was defined using ionic radii from the viewpoint of crystallography. The utility of this effective index on some electrical properties was investigated.This revised version was published online in November 2005 with corrections to the Cover Date. |
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| Keywords: | ceria effective index electrical conductivity ion transport number of oxygen yttria |
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