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Magnetic and Magneto-Optical Oroperties of Iron Oxides Nanoparticles Synthesized under Atmospheric Pressure

机译:在大气压下合成的氧化铁纳米粒子的磁性和磁光性能

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摘要

Magnetite nanoparticles were synthesized by a simple thermal decomposition process, involving only iron (III) nitrate nonahydrate as a precursor, and hexadecylamine as a solvent and stabilizer at reaction temperatures varied from 200 to 380 °C. The results of the structural analysis showed that the average crystallite size depends on the reaction temperature and increases from 4.8 to 13.3 nm. The behavior of the coercivity indicates that all synthesized samples are single domain; herewith, it was found that the critical size corresponding to the transition to the superparamagnetic state at room temperature is about 9 nm. The effect of the reaction temperature on changes in the saturation magnetization was studied. It was found that the size effect in the MCD spectra is observed for the IVCT transition and one ISCT transition, and the influence of the reaction temperature on the change in the MCD spectra was discussed.
机译:通过简单的热分解过程合成磁铁矿纳米颗粒,仅涉及铁(III)硝酸盐非水合物作为前体,并且在反应温度下作为溶剂和稳定剂的十六烷胺不同于200至380℃。结构分析的结果表明,平均微晶尺寸取决于反应温度,从4.8增加到13.3nm。矫顽力的行为表明所有合成样本都是单个域;在此,发现对应于室温下与超顺磁状态的过渡对应的临界大小约为9nm。研究了反应温度对饱和磁化强度变化的影响。发现,讨论了IVCT转变和一个ISCT转变的MCD光谱中的尺寸效应,并讨论了反应温度对MCD光谱变化的影响。

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