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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Lanthanum ferrite ferromagnetic nanocrystallites by a polymeric precursor route
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Lanthanum ferrite ferromagnetic nanocrystallites by a polymeric precursor route

机译：镧系铁氧体铁磁性纳米微晶的聚合前体途径

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摘要

Reactive lanthanum orthoferrite nanoparticles were obtained by a polymeric precursor route. Nanopar-ticle growth and crystallization from amorphous precursor, as well as the formation of a grain boundary network in polycrystalline aggregates at different calcination temperatures were studied by conventional and high-resolution electron microscopy; electron and X-ray diffraction analysis; Raman; IR; and UV-vis spectroscopy. Microstructure measurements were compared to X-ray diffraction and chemical analysis results. Electron diffraction, combined with electron microscopy results were used to determine the content of amorphous phase. The coherent crystalline domain size and the particle size have been monitored by XRD and electron microscopy in order to determine the evolution of both crystal size and the onset temperature for crystallites formation. The results demonstrate that at 550 °C we obtain pure single-phase nanocrystalline LaFeO_3, sized ~40 nm, without the presence of amorphous phase. The magnetization curves in the 5-350 K range indicate weak ferromagnetism of the LaFeO_3 powders.
机译：通过聚合的前体途径获得反应性正铁酸镧纳米颗粒。通过常规和高分辨率电子显微镜研究了纳米颗粒从非晶态前体的生长和结晶，以及在不同煅烧温度下多晶聚集体中晶界网络的形成。电子和X射线衍射分析;拉曼IR;和紫外可见光谱。将微结构测量结果与X射线衍射和化学分析结果进行了比较。电子衍射，结合电子显微镜结果，用于确定非晶相的含量。为了确定晶体尺寸和晶粒形成起始温度的演变，已经通过XRD和电子显微镜监测了相干的晶体畴尺寸和粒径。结果表明，在550°C下，我们获得了尺寸约为40 nm的纯单相纳米LaFeO_3纳米晶，而没有非晶相。在5-350 K范围内的磁化曲线表明LaFeO_3粉末的铁磁性弱。

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