Phase relations, chemical diffusion and electrical conductivity in pure and doped Sr4Fe6O13 mixed conductor materials

被引：33

作者：

Bredesen, R

Norby, T

Bardal, A

Lynum, V

机构：

[1] SINTEF, Mat Technol, N-0314 Oslo, Norway

[2] Univ Oslo, Dept Chem, Ctr Mat Sci, N-0349 Oslo, Norway

[3] SINTEF, Mat Technol, N-7034 Trondheim, Norway

来源：

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

关键词：

phase intergrowth; chemical diffusion coefficient; electrical conductivity; Sr4Fe6O13 defect model; effects of La/Ti-doping;

D O I：

10.1016/S0167-2738(00)00382-9

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：

Phase relations and transport properties of undoped and La and/or Ti-doped Sr4Fe6O13 have been studied. In the doped materials significant amounts of perovskite SrFeO3-delta were formed together with SrFe12O19. An intergrowth on nanoscale of SrFeO3-delta and Sr4Fe6O13 was observed in the TEM for the La-doped material. The content of La was higher in the SrFeO3-delta than in the Sr4Fe6O13 phase. The electrical conductivity and chemical diffusion coefficient of undoped and La/Ti-doped Sr4Fe6O13 have been measured and a defect model for undoped Sr4Fe6O13 is presented. The transport properties of doped Sr4Fe6O13 reflect multiphase materials mainly dominated by the perovskite phase. (C) 2000 Elsevier Science B.V. All rights reserved.

引用

页码：687 / 697

页数：11

共 19 条

[11] Determination of oxygen permeation kinetics in a ceramic membrane based on the composition SrFeCo0.5O3.25-δ [J].