Oxygen nonstoichiometry, thermo-chemical stability and lattice expansion of La0.6Sr0.4FeO3-δ

被引:131
作者
Kuhn, M. [1 ]
Hashimoto, S. [2 ]
Sato, K.
Yashiro, K.
Mizusaki, J.
机构
[1] Tohoku Univ, Inst Multidisciplinary Res Adv Mat, Prof Mizusaki Lab, Aoba Ku, Sendai, Miyagi 9808577, Japan
[2] Tohoku Univ, Grad Sch Environm Studies, Aoba Ku, Sendai, Miyagi 9808579, Japan
关键词
Strontium doped lanthanum ferrite; Oxygen nonstoichiometry; High-temperature X-ray diffractometry; Chemical expansion; ELECTRICAL-CONDUCTIVITY RELAXATION; SUBSTITUTED LANTHANUM FERRITE; DEFECT STRUCTURE; ELECTRONIC CONDUCTIVITY; THERMAL-EXPANSION; LA1-XSRXFEO3-DELTA; PEROVSKITES; TRANSPORT; FE; COEFFICIENT;
D O I
10.1016/j.ssi.2011.05.013
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
The oxygen nonstoichiometry of La0.6Sr0.4FeO3-delta was measured at intermediate temperatures (773 to 1173 K) between 1 bar and the decomposition oxygen partial pressure by thermogravimetry and coulometric titration. The decomposition of the ABO(3) perovskite phase was found to occur at low oxygen partial pressures (below 10(-20) bar). Using an atmosphere-controlled high-temperature XRD setup, the rhombohedral lattice parameters were obtained between 10(-4) and 1 bar at 773 to 1173 K. A phase transition from rhombohedral to cubic might be expected to occur at high temperatures and for delta near the plateau at delta = [Sr]/2. The lattice expansion was separated into "pure" thermal and chemically induced expansion by combining the lattice parameters with the oxygen nonstoichiometry data. The linear thermal expansion was formulated with a "pure" thermal expansion coefficient of alpha(th) = 11.052.10(-6) K-1 and a chemical expansion coefficient of alpha(chem) = 1.99-4.10(-2). The results were compared with previous data obtained for La0.6Sr0.4Co1-yFeyO3-delta with y = 0.2-0.8. La0.6Sr0.4FeO3-delta was confirmed to show the highest thermo-chemical stability. While the chemical expansion of La0.6Sr0.4Co1-yFe5O3-delta seems little affected by the iron content, the thermal expansion coefficient was the lowest for La0.6Sr0.4FeO3-delta. (C) 2011 Elsevier B.V. All rights reserved.
引用
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页码:7 / 15
页数:9
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