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首页> 外文期刊>Materials Science and Engineering. B, Solid-State Materials for Advanced Technology >Nano-sized impurity phases in relation to the mode of preparation of LiFePO_4
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Nano-sized impurity phases in relation to the mode of preparation of LiFePO_4

机译：纳米级杂质相与LiFePO_4制备方式的关系

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摘要

Microcrystalline LiFePO_4 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 (γ-Fe_2O_3 clusters) or weakly ferromagnetic (Fe_2P 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 γ-Fe_2O_3 per formula) in which case no collective behavior is observed, to large concentrations (1.9 x 10~(-4) of Fe_2P clusters per formula) where the dipolar interaction generates superferromagnetism. Ferromagnetic resonance experiments are also reported, and are a probe of the γ-Fe_2O_3 nanoparticles. An overall understanding of the different properties is achieved within a model of superferromagnetism induced by interacting Fe_2P nanoparticles, which is also reported.
机译：微晶LiFePO_4样品已使用四种不同的技术进行了生长。使用X射线衍射（XRD）光谱和傅里叶变换红外光谱（FTIR）分析结构性能。取决于所使用的制备技术，所获得的材料要么不含任何可检测的杂质，要么包含纳米级簇形式的杂质相。发现磁性能是表征它们的有力工具。他们提供了纳米级铁磁颗粒的证据，取决于制备工艺，它们可以是强磁性的（γ-Fe_2O_3团簇）或弱磁性的（Fe_2P团簇）。磁簇的浓度还取决于制备过程，浓度从小浓度（每个分子式为1.0 x 10〜（-6）γ-Fe_2O_3）（在这种情况下未观察到集体行为）到大浓度（1.9 x 10〜（- -4）每个分子式的Fe_2P簇），其中偶极相互作用产生超铁磁性。还报道了铁磁共振实验，并且是γ-Fe_2O_3纳米粒子的探针。在由Fe_2P纳米粒子相互作用引起的超铁磁性模型中也获得了对不同性质的全面理解，这也已有报道。

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