A study of diffusion behavior of elements lanthanum and oxygen in Mo-La2O3cathode

The diffusion behavior of elements lanthanum and oxygen in Mo-La2O3 cathode has been carried out by using Auger Electron Spectroscopy. Lanthanum and o xygen ions (La3+ and O2+) diffuse from the grain boundaries to the surface. The experimental results were analyzed by kinetics of grain boundary diffu sion. In the temperature range 1123 K-1423 K, the diffusion coefficients of La3+ and O2- ions were found to fit with the following expression: D-La = 3.6703 x 10(-16) exp(-1.01639 x 10(5)/RT) m(2) s(-1) D-O = 1.5122 x 10(-16) exp(-8.13066 x 10(4)/RT) m(2) s(-1) (C) 2000 Elsevier Science S.A. All rights reserved.