Effect of B-site substitution on the stability of La0.2Sr0.8Fe0.8B0.2O3-δ, B = Al, Ga, Cr, Ti, Ta, Nb

被引：18
|
作者：
Lohne, Orjan Fossmark [1 ]
Gurauskis, Jonas [1 ]
Tan Nhut Phung [2 ,3 ]
Einarsrud, Mari-Ann [1 ]
Grande, Tor [1 ]
Bouwmeester, Henny J. M. [2 ,3 ]
Wiik, Kjell [1 ]
机构：
[1] Norwegian Univ Sci & Technol, Dept Mat Sci & Engn, NO-7491 Trondheim, Norway
[2] Univ Twente, Fac Sci & Technol, NL-7500 AE Enschede, Netherlands
[3] Univ Twente, MESA Inst Nanotechnol, NL-7500 AE Enschede, Netherlands
来源：
SOLID STATE IONICS | 2012年 / 225卷
关键词：
MIEC; Perovskite; Stability; Temperature programmed reduction (TPR); CRYSTAL;
D O I：
10.1016/j.ssi.2012.02.061
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：
Single phase, cubic perovskites of composition La0.2Sr0.8Fe0.8B0.2O3 - delta, B = Al, Ga, Cr, Ti, Ta and Nb, were prepared by spray pyrolysis from aqueous precursor solutions. The effect of B-site substitution on the stability in a H-2 containing atmosphere was investigated using temperature programmed reduction (TPR). High temperature X-ray diffraction (HT-XRD) was performed under conditions similar to those in the TPR experiments. La0.2Sr0.8FeO3 - delta forms a brownmillerite-type anion-deficient ordered perovskite upon reduction at T approximate to 500. B-site substitution suppresses oxygen vacancy ordering, maintaining a perovskite structure under the above reducing conditions up to T approximate to 700 degrees C. Trends in the kinetics of decomposition of B-site substituted La0.2Sr0.8FeO3 - delta are discussed. (c) 2012 Elsevier B.V. All rights reserved.
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收藏
页码：186 / 189
页数：4
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