Thermal expansion of Gd-doped ceria and reduced ceria

被引:271
作者
Hayashi, H
Kanoh, M
Quan, CJ
Inaba, H
Wang, SR
Dokiya, M
Tagawa, H
机构
[1] Chiba Univ, Fac Educ, Dept Sci Educ, Inage Ku, Chiba 2638522, Japan
[2] Yokohama Natl Univ, Inst Environm Sci & Technol, Res Ctr, Hodogaya Ku, Yokohama, Kanagawa 2400067, Japan
关键词
thermal expansion coefficient; gadolinium-doped ceria; reduced ceria;
D O I
10.1016/S0167-2738(00)00646-9
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The thermal expansion coefficients of CeO2 and Gd-doped ceria were measured in the range from 100 to 873 K and those of reduced ceria were measured from 100 to 323 K. The thermal expansion coefficient of Ce1-xGdxO2-x/2 became large with increasing the dopant content, x. The thermal expansion coefficient of reduced ceria became large with increasing the vacancy content of oxygen. These increases of the thermal expansion coefficients result from weakening binding energy due to the increase of oxygen vacancy. The thermal expansion coefficients of CeO2 and Gd-doped ceria were calculated theoretically and they were in good agreement with experimental ones except for the higher temperature range. (C) 2000 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:227 / 233
页数:7
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