Low temperature synthesis and structural characterization of over-stoichiometric LaMnO3+δ perovskites

被引：30

作者：

Barnabé, A ^{[1
]}

Gaudon, M ^{[1
]}

Bernard, C ^{[1
]}

Laberty, C ^{[1
]}

Durand, B ^{[1
]}

机构：

[1] Univ Toulouse 3, CNRS, Lab CIRIMAT, LCMIE,UMR 5085, F-31062 Toulouse 4, France

来源：

MATERIALS RESEARCH BULLETIN | 2004年 / 39卷 / 4-5期

关键词：

X-ray diffraction;

D O I：

10.1016/j.materresbull.2003.10.008

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Powders of perovskite LaMnO3+delta with large over-stoichiometry coefficient delta up to delta = 0.29 have been synthetized by two different soft chemistry routes using hydrothermal treatment at 150 degreesC and sol-gel process. Structural and morphological properties were examined by thermal analysis, X-ray diffraction and transmission electron microscopy. Rietveld refinement led to rhombohedral distorted perovskite for all the over-stoichiometric LaMnO3+delta with 0.10 < delta < 0.29. These studies confirm from structural parameters analysis the solubility limit of cationic vacancies previously evidenced by Maurin et al. by X-ray absorption spectroscopy. Special attention was devoted to the correlation between grain size, synthesis pathways, calcination temperature and the formal Mn-IV content. (C) 2003 Elsevier Ltd. All rights reserved.

引用

页码：725 / 735

页数：11

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