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(FeCo)_3Si-SiO_x core-shell nanoparticles fabricated in the gas phase

机译：（FeCo）_3Si-SiO_x核壳纳米粒子的气相制备

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摘要

A method of fabricating core-shell nanoparticles by using an integrated nanoparticle deposition technique in the gas phase is reported. The principle of the method is based on nanoparticle growth from the vapour phase, during which elements showing lower surface energies prefer to form the shells and elements showing higher surface energies prefer to stay in the cores. This method was applied successfully to the Fe-Co-Si ternary system to fabricate core-shell-type nanoparticles. The nanoparticles were exposed in air after collection to achieve oxidation. The analysis results based on transmission electron microscopy (TEM), Auger electron spectroscopy (AES), x-ray diffraction (XRD), and a superconducting quantum interference device (SQUID) showed that the core parts are magnetic materials of body-centred cubic (bcc) structured (FeCo)_3Si of 15 nm in diameter, and the shell parts are amorphous SiO_x of 2 nm in thickness. These core-shell-type nanoparticles show a magnetic anisotropy constant of about 7 x 10~5 erg cm~(-3) and a saturation magnetization of around 1160 emu cm~(-3), which is much higher than that of iron oxide. After annealing at 300 deg C in air, (FeCo)_3Si-SiO_x core-shell-type nanoparticles showed a little bit of a drop in magnetic moment, while pure FeCo nanopariticles totally lost their magnetic moment. This means that the shells of SiO_x are dense enough to prevent the magnetic cores from oxidation.
机译：报道了一种通过在气相中使用集成纳米颗粒沉积技术来制造核-壳纳米颗粒的方法。该方法的原理基于从气相生长的纳米颗粒，在此期间，显示较低表面能的元素倾向于形成壳，而显示较高表面能的元素倾向于保留在核中。该方法已成功应用于Fe-Co-Si三元体系，制备了核-壳型纳米粒子。收集后，纳米颗粒暴露在空气中以实现氧化。基于透射电子显微镜（TEM），俄歇电子能谱（AES），X射线衍射（XRD）和超导量子干涉仪（SQUID）的分析结果表明，核心部分是体心立方（ bcc）结构的（FeCo）_3Si的直径为15 nm，壳部分为厚度为2 nm的非晶SiO_x。这些核壳型纳米粒子的磁各向异性约为7 x 10〜5 erg cm〜（-3），饱和磁化强度约为1160 emu cm〜（-3），远高于氧化铁。 。在空气中于300℃退火后，（FeCo）_3Si-SiO_x核-壳型纳米颗粒的磁矩有所降低，而纯FeCo纳米颗粒完全失去了磁矩。这意味着SiO_x的外壳足够致密，可以防止磁芯氧化。

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