Characterization of LaMeO3 (Me: Mn, Co, Fe) perovskite powders obtained by polymerizable complex method

被引：149

作者：

Popa, M ^{[1
]}

Frantti, J ^{[1
]}

Kakihana, M ^{[1
]}

机构：

[1] Tokyo Inst Technol, Mat & Struct Lab, Midori Ku, Yokohama, Kanagawa 2268503, Japan

来源：

SOLID STATE IONICS | 2002年 / 154卷

基金：

日本学术振兴会;

关键词：

LaMnO3.15; LaCoO3; LaFeO3 perovskite-type oxides; Raman spectroscopy; polymerizable complex method; nanopowders;

D O I：

10.1016/S0167-2738(02)00421-6

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：

LaMeO3 (Me: Mn, Fe and Co) perovskites, obtained by polymerizable complex method at 900 degreesC for 6 h with grain size of 80 mu, were examined by X-ray diffraction (XRD), scanning electron microscopy (SEM) and Raman spectroscopy. The Raman active phonons in perovskites crystallized in rhombohedral symmetry-LaMnO3.15 and LaCoO3-and orthorhombic symmetry-LaFeO3-were reported. Raman spectra were excited using Ar+ laser (wavelength 514.5 run) with various laser beam powers between 10 and 450 muW on a sample at room temperature. Raman bands were compared to those reported for other similar systems with the orthorhombic and rhombohedral Pbnm structure. The Raman spectra of LaMnO3.15 and LaCoO3 were strongly dependent on the laser beam power. Raman spectra obtained for the studied systems are related to many factors as the laser irradiation and the structure of LaMnO3.15, LaFeO3 and LaCoO3 which greatly depends on the method of preparation, particle size, oxygen content, symmetry, temperature or the oxygen partial pressure. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：135 / 141

页数：7

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