Surface segregation of La2O3 molecules in Mo-La2O3 cathode materials
来源期刊：中国有色金属学报(英文版)2000年第6期
论文作者：王金淑 周美玲 聂祚仁 张久兴 左铁镛 王亦曼
文章页码：745 - 748
Key words：segregation; lanthanum; oxygen; cathode; kinetics; Mo- La2O3
Abstract:
The surface segregation of La2O3 in Mo- La2O3 cathode was carried out by Auger electron spectroscopy. Lanthanum and oxygen ions (La3+and O2-) diffuse from the grain boundaries to the surface respectively, and these ions recombine into La2O3 molecules on the surface. The results were analyzed by kinetics of grain boundary diffusion. In the temperature range of 1123~1423K, the diffusion coefficients of La3+ and O2- ions were found to fit with the following equations: DLa=3.670 3×10-16 exp(-1.01639×105 /RT)
DO=1.512 2×10-16 exp(-8.13066×104 /RT).
