XAFS characterization of La1-xSrxMnO3±δ catalysts prepared by Pechini's method

被引：13
|
作者：
Melo, DMA [1 ]
Borges, FMM [1 ]
Ambrosio, RC [1 ]
Pimentel, PM [1 ]
da Silva, CN [1 ]
Melo, MAF [1 ]
机构：
[1] Univ Fed Rio Grande do Norte, CCET, Dept Quim, BR-59078970 Natal, RN, Brazil
来源：
CHEMICAL PHYSICS | 2006年 / 322卷 / 03期
关键词：
La1-xSrxMnO +/-delta catalysts; XAFS; JT distortion; defect; oxygen desorption;
D O I：
10.1016/j.chemphys.2005.09.008
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：
XAFS experiments at the Mn and Sr K-edges were carried out in order to investigate the short-range arrangement of Mn and Sr sites oil La1-xSrxMnO3 +/-delta highly doped perovskites (x = 0, 0.2, 0.4 and 0.6). The Mn K-edge EXAFS spectra show a static Jahn-Teller distortion of the MnO6 for x = 0 and 0.2. which is drastically reduced as x increases. The distortion of perovskite. characterized by the MnO-Mn tilt angle, progressively decreases with increasing Sr contents. Sr K-edge results indicated a decrease oil the Sr-Mn coordination number upon Sr doping. Based on this and TPD results, a charge compensating mechanism is proposed suggesting a partial Mn oxidation and formation of Mn defect vacancies due to the introduction of Sr. (c) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码：477 / 484
页数：8
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