期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 21, 期 10-11, 页码 1743-1747出版社
ELSEVIER SCI LTD
DOI: 10.1016/S0955-2219(01)00107-8
关键词
diffusion; electrical properties; perovskites; sensors; surfaces
A theoretical point defect model for the transition between two equilibrium states is proposed. Material constants are taken from lanthanum-doped SrTiO3, which serves as a model material for donor-doped perovskites. A finite-differences method is used to compute the time dependent evolution of defect concentrations after an excitation of the system. For the calculation of the particle fluxes of all charged defects, time variant surface concentrations of all mobile species are considered via local defect equilibria. As the surface concentrations differ significantly from the new equilibrium values, a drastic change of the electrical properties in the nearsurface region is expected. The new approach is strongly supported by the resistivity change of the material in an oxidation experiment. A comparison between simulation and experimental data confirms the excellent applicability of the model. (C) 2001 Published by Elsevier Science Ltd.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据