BSCF epitaxial thin films: Electrical transport and oxygen surface exchange

被引:35
作者
Burriel, Monica [1 ]
Niedrig, Christian [1 ]
Menesklou, Wolfgang [1 ]
Wagner, Stefan F. [1 ]
Santiso, Jose [3 ]
Ivers-Tiffee, Ellen [1 ,2 ]
机构
[1] KIT, IWE, D-76131 Karlsruhe, Germany
[2] KIT, DFG Ctr Funct Nanostruct, D-76131 Karlsruhe, Germany
[3] CSIC ICN, CIN2, Bellaterra 08193, Spain
关键词
BSCF; Epitaxial thin films; PLD; Electrical conductivity; Surface exchange coefficient; OXIDE FUEL-CELLS; PEROVSKITE-TYPE OXIDES; PERMEATING MEMBRANE; PERFORMANCE; CATHODE; BA0.5SR0.5CO0.8FE0.2O3-DELTA; SOFC; PERMEABILITY; KINETICS; CONDUCTIVITY;
D O I
10.1016/j.ssi.2010.03.005
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
Ba(0.5)Sr(0.5)Co(0.8)Fe(0.2)O(3-delta) (BSCF) shows promising oxygen transport properties for the use as oxygen separation membranes and cathode material for solid oxide fuel cells. In order to evaluate the electrical conductivity properties as well as surface exchange coefficients without the influence of grain boundaries present in polycrystalline bulk samples, high-quality epitaxial BSCF thin films on single crystal NdGaO(3) (110) (NGO) substrates were prepared for the first time. This was achieved by pulsed laser deposition (PLD) using single-phase cubic targets sintered from powder prepared via the mixed oxide route. Structural and compositional properties of the thin films were verified by various X-ray diffraction techniques as well as by scanning electron microscopy (SEM). The electrical conductivity of the thin films was measured in dependence of temperature and compared to values obtained by measurements on polycrystalline bulk samples from the same powder as well as data from literature, showing different activation energies and higher general conductivity. Dependence of the conductivity on oxygen partial pressure has also been studied, revealing a rather small variation and indicating a possible phase change beginning to occur at oxygen partial pressures below 10(-4) bar. Additionally, the surface exchange coefficient k(Chem) of the purely surface exchange controlled samples was determined by a conductivity relaxation technique and yielded an activation energy of 93 kJ/mol. (C) 2010 Elsevier B.V. All rights reserved.
引用
收藏
页码:602 / 608
页数:7
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