Oxygen vacancy formation and ionic transport in Sr4Fe6O13±δ

被引:28
作者
Avdeev, MY
Patrakeev, MV
Kharton, VV [1 ]
Frade, JR
机构
[1] Univ Aveiro, Dept Ceram & Glass Engn, UIMC, P-3810193 Aveiro, Portugal
[2] Russian Acad Sci, Inst Solid State Chem, Ural Div, Ekaterinburg 620219, Russia
[3] Belarusian State Univ, Inst Physicochem Problems, Minsk 220080, BELARUS
关键词
strontium ferrite; neutron diffraction; oxygen permeation; oxygen vacancy; ionic conductivity;
D O I
10.1007/s100080100231
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
Oxygen permeation through dense Sr4Fe6O13+/-delta membranes was found to be limited by the bulk ambipolar conductivity. At 1173 K and oxygen partial pressures 10 to 1.01x10(5) Pa, ionic conductivity of intergrowth strontium ferrite increases with reducing oxygen pressure, indicating that the vacancy migration mechanism provides a greater contribution to ionic transport in comparison with the interstitial diffusion. The ion transference numbers of Sr4Fe6O13+/-delta increase from 2.5x10(-4) to 1.9x10(-3) when the oxygen pressure decreases. Combined X-ray and neutron powder diffraction studies of oxygen-deficient Sr4Fe6O13-delta showed an accumulation of oxygen vacancies in the non-perovskite layers, built of oxygen-iron polyhedra with pentacoordinated Fe cations. Both thermal and chemically-induced expansion of Sr4Fe6O13+/-delta lattice have pronounced anisotropic character and are considerably lower than that typical for perovskite-type strontium ferrite. The average thermal expansion coefficients of Sr4Fe6O13+/-delta ceramics at 770-1100 K in oxidizing and reducing atmospheres vary in the range (10.8-13.2)x 10(-6) K-1.
引用
收藏
页码:217 / 224
页数:8
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