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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Structural and magnetic properties of sonoelectrocrystallized magnetite nanoparticles
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Structural and magnetic properties of sonoelectrocrystallized magnetite nanoparticles

机译：声电结晶磁铁矿纳米粒子的结构和磁性

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摘要

The effect of ultrasound power on the morphology, structure and magnetic properties of magnetite nanoparticles synthesized from iron electrodes by the electro-oxidation method was investigated. Samples made in aqueous solution in the absence or presence of an organic stabilizer (thiourea, tetramethylammonium chloride, sodium butanoate or β-cyclodextrine) were characterized by x-ray diffraction, transmission and scanning electron microscopy, magnetometry and M?ssbauer spectrometry. The iron is almost all in the form of 20-85 nm particles of slightly nonstoichiometric Fe_(3-δ)O_4, with δ ≈ 0.10. Formation of a paramagnetic secondary phase in the presence of sodium butanoate or β-cyclodextrine is supressed by ultrasound. Specific magnetization of the magnetite nanoparticles ranges from 19 to 90Am~2 kg~(-1) at room temperature, and it increases with particle size in each series. The particles show no sign of superparamagnetism, and the anhysteretic and practically temperature-independent magnetization curves are associated with a stable magnetic vortex state throughout the size range. The spin structure of the particles and the use of magnetization measurements to detect magnetite in unknown mixtures are discussed.
机译：研究了超声功率对通过电氧化法从铁电极合成的磁铁矿纳米颗粒的形貌，结构和磁性的影响。在不存在或存在有机稳定剂（硫脲，氯化四甲铵，丁酸钠或β-环糊精）的情况下，在水溶液中制成的样品用X射线衍射，透射和扫描电子显微镜，磁力分析和Msssbauer光谱表征。铁几乎全部以20-85 nm的形式存在，这些颗粒为非化学计量的Fe_（3-δ）O_4，δ≈0.10。超声抑制了在丁酸钠或β-环糊精存在下顺磁性第二相的形成。在室温下，磁铁矿纳米粒子的比磁化强度在19至90Am〜2 kg〜（-1）范围内，并随粒径的增加而增加。颗粒没有显示出超顺磁性的迹象，并且在整个尺寸范围内，无磁和实际上与温度无关的磁化曲线与稳定的磁涡旋状态相关。讨论了粒子的自旋结构以及使用磁化强度检测未知混合物中磁铁矿的方法。

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