Nano-sized impurity phases in relation to the mode of preparation of LiFePO4

被引:113
作者
Salah, AA
Mauger, A
Julien, CM
Gendron, F
机构
[1] CNRS, Dept MIPPU, F-75015 Paris, France
[2] Univ Paris 06, CNRS, UMR 7588, Inst Nanosci Paris,Lab Associe, F-75015 Paris, France
来源
MATERIALS SCIENCE AND ENGINEERING B-SOLID STATE MATERIALS FOR ADVANCED TECHNOLOGY | 2006年 / 129卷 / 1-3期
关键词
LiFePO4; nanoparticles; XRD; FTIR; ESR;
D O I
10.1016/j.mseb.2006.01.022
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Microcrystalline LiFePO4 samples have been grown using four different techniques. The structural properties are analyzed using X-ray diffraction (XRD) spectroscopy and Fourier transform infrared spectroscopy (FTIR). Depending on which technique of preparation is used, the material is obtained either free of any detectable impurity, or include impurity phases under the form of nano-sized clusters. The magnetic properties are found to be a powerful tool to characterize them. They give evidence of nano-sized ferromagnetic particles, which can be either strongly magnetic (gamma-Fe2O3 clusters) or weakly ferromagnetic (Fe2P clusters), depending on the preparation process. The concentration of magnetic clusters also depends on the preparation process and varies from small concentration (1.0 x 10(-6) of gamma-Fe2O3 per formula) in which case no collective behavior is observed, to large concentrations (1.9 x 10(-4) of Fe2P clusters per formula) where the dipolar interaction generates superferromagnetism. Ferromagnetic resonance experiments are also reported, and are a probe of the gamma-Fe2O3 nanoparticles. An overall understanding of the different properties is achieved within a model of superferromagnetism induced by interacting Fe,P nanoparticles, which is also reported. (c) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码:232 / 244
页数:13
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