• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Nanotechnology >(FeCo)3Si-SiOx core-shell nanoparticles fabricated in the gas phase
【24h】

(FeCo)3Si-SiOx core-shell nanoparticles fabricated in the gas phase

机译：（FeCo）3Si-SiOx核壳纳米粒子的气相制备

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

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)(3)Si of 15 nm in diameter, and the shell parts are amorphous SiOx 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 degrees C in air, ( FeCo)(3)Si-SiOx 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 SiOx 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的磁性材料（ bcc）结构的（FeCo）（3）Si直径为15 nm，壳部分为厚度为2 nm的非晶SiOx。这些核壳型纳米粒子显示约7 x 10（5）erg cm（-3）的磁各向异性常数和约1160 emu cm（-3）的饱和磁化强度，远高于氧化铁。在空气中于300摄氏度下退火后，（FeCo）（3）Si-SiOx核-壳型纳米颗粒显示出磁矩的少许下降，而纯FeCo纳米颗粒完全丧失了其磁矩。这意味着SiOx的外壳足够致密，可以防止磁芯氧化。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号