Oxygen non-stoichiometry of La0.6Sr0.4Co0.2Fe0.8O3-δ under uniaxial compression evaluated by coulometric titration

被引：2
作者：
Araki, Wakako [1 ]
Miaolong, Qiu [1 ]
Arai, Yoshio [1 ]
机构：
[1] Saitama Univ, Dept Mech Engn, Sakura Ku, 255 Shimo Okubo, Saitama 3388570, Japan
来源：
ELECTROCHIMICA ACTA | 2017年 / 253卷
基金：
日本学术振兴会;
关键词：
Oxygen non-stoichiometry; La-Sr-Co-Fe-O; Mechanical stress; Chemical strain; YTTRIA-STABILIZED ZIRCONIA; MIXED CONDUCTING OXIDES; MECHANICAL-STRESS; CHEMICAL DIFFUSION; LA0.58SR0.4CO0.2FE0.8O3-DELTA; LA0.8SR0.2COO3-DELTA; BEHAVIOR; STRAIN; MODEL;
D O I：
10.1016/j.electacta.2017.09.073
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
In this study, the oxygen non-stoichiometry in La0.6Sr0.4Co0.2Fe0.8O3-delta (LSCF) under uniaxial compressive stress up to 77 MPa was investigated by means of coulometric titration. The oxygen deficiency determined by the transient current was almost constant under compression, whereas both cell resistance and relaxation time significantly increased and these two parameters showed good correlation. Their increase appears to be related to the oxidation process on the surface of LSCF decelerated by the contact pressure, whereas the compressive stress had little effect on the oxygen deficiency in LSCF. Creep deformation was found to have limited effect on oxygen deficiency. Experimental observation also demonstrated that chemical expansion could cause unexpected internal stress, which would not change the oxygen deficiency. (C) 2017 Elsevier Ltd. All rights reserved.
引用
收藏
页码：339 / 343
页数：5
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