Oxygen transport properties in ZrO2-CeO2-Y2O3 by SIMS analysis

被引：33

作者：

Naito, H ^{[1
]}

Sakai, N

Otake, T

Yugami, H

Yokokawa, H

机构：

[1] Natl Aerosp Lab, Chofu, Tokyo 1828522, Japan

[2] Natl Inst Mat & Chem Res, Tsukuba, Ibaraki 3058565, Japan

[3] Tohoku Univ, Grad Sch Engn, Sendai, Miyagi 9808579, Japan

来源：

SOLID STATE IONICS | 2000年 / 135卷 / 1-4期

关键词：

mixed conductor; oxygen tracer diffusion coefficient; surface exchange coefficient; SIMS;

D O I：

10.1016/S0167-2738(00)00378-7

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：

A mixed conductor, ZrO2-CeO2-Y2O3 (Ce-YSZ), exhibits anomalous electrical properties depending on oxygen partial pressure and CeO2 concentration. We measured surface reaction rates and oxygen tracer diffusion coefficients of YSZ with various CeO2 concentrations by secondary ion mass analyses. The Ce concentration dependence of oxygen tracer diffusion coefficient in air corresponds with that of the total electrical conductivity, over which the ionic conductivity is dominant. The surface exchange coefficient, however, had a higher value in the region of 20 similar to 60 mol% CeO2 containing YSZ compared to other compositions. Ce-YSZ, which contains this region of CeO2 concentration, exhibits high electronic conduction at reducing conditions. The ionic and electronic conductivities are considered to affect the oxygen tracer diffusion coefficient and the surface exchange coefficient, respectively. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：669 / 673

页数：5

共 9 条

[1] ELECTRICAL-PROPERTIES IN THE ZRO2-CEO2-Y2O3 SYSTEM [J].