玻璃晶化法制备多核磁铁矿纳米粒子及其磁性能
Multicore magnetite nanoparticles prepared by glass crystallisation and their magnetic properties
摘要：
使用Fe 2 O3作为原料熔融组成为13 K2 O * 13 Al 2 O3 * 16 B2 O3 * 43 SiO2 * 15 Fe 2 O3-x的钾铝硼硅酸盐玻璃。将熔体从具有落水管的Pt坩埚倾倒在水中，这导致形成尺寸为约100 - 150 nm的相分离液滴。在该液滴中，观察到尺寸约为10-20 nm的磁铁矿晶体。这些具有超顺磁性行为的磁铁矿纳米颗粒被排列成更大的聚集体。这导致更高的有效磁半径。根据磁化测量，颗粒显示出磁滞。相对于饱和磁化强度的比率不像单轴各向异性所需的那样高。可以通过在浓氢氧化钠中蒸煮粉碎的玻璃来避免相分离。附加的温度相关磁弛豫（TMRX）测量表明，在磁矩弛豫的分布在温度过程中的两个峰值在13和39 K。根据小于5 dC（核心直径）的粒子间距离，这可能是强磁相互作用的结果。其他磁弛豫过程也解释了这种测量效果。
英文摘要：
A potassium alumina borosilicate glass with the composition 13K2O*13Al2O3*16B2O3*43SiO2*15Fe2O3-x was melted using Fe2O3 as raw material. The melt was dumped from a Pt-crucible with a downpipe in water which resulted in the formation of phase separated droplets with a size of around 100 - 150 nm. In this droplets, magnetite crystals with a size of around 10-20 nm were observed. These magnetite nanoparticles with superparamagnetic behaviour are arranged to larger aggregates. This leads to a higher effective magnetic radius. According to magnetisation measurements the particles show hysteresis. The ratio of remanent vs. saturation magnetisation is not as high as it is necessary for uniaxial anisotropy. It is possible to elude the phase separations by cooking the pulverized glass in concentrated sodium hydroxide. Additional temperature dependent magnetorelaxometry (TMRX) measurements show in the distribution of the relaxation of magnetic moments over the course of temperature two peaks at 13 and 39 K. According to an interparticle distance smaller than 5 dC (the core diameter) could that be a result of strong magnetic interactions. Other magnetic relaxation processes also explain this measured effect.
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