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首页> 外文期刊>Journal of Crystal Growth >Gas-phase preparation of L1_0 ordered FePt nanoparticles
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Gas-phase preparation of L1_0 ordered FePt nanoparticles

机译：L1_0有序FePt纳米粒子的气相制备

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摘要

We present a technique to prepare FePt nanoparticles from the gas-phase which aims to obtain L1_0 ordered FePt nanoparticles by thermal sintering in the gas-phase. The particles in the size range 3-20 nm are generated via inert-gas condensation using DC-sputtering at very high pressures in the mbar range. Prior to their deposition, the particles are thermally sintered in the gas-phase at temperatures between 293 and 1273 K. The particles are mainly investigated by (high resolution) transmission electron microscopy. Depending on the inert-gas pressure and the sintering temperature, the morphology and the structure of the FePt nanoparticles changes dramatically. FePt nanoparticles prepared at 0.5 mbar show no agglomeration and, therefore, have a very small size distribution with a geometrical standard deviation σ_g = 1.1. Using pressures p ≥ 1.0 mbar, we observe particle agglomeration and broadening of the particles size distribution. While particles prepared at p = 0.5 mbar show icosahedral structures up to sintering temperatures of 1273 K, the preparation at p> 0.5 mbar and high sintering temperatures (1273 K) leads to single crystalline particles with L1_0-ordering.
机译：我们提出了一种从气相制备FePt纳米粒子的技术，旨在通过在气相中进行热烧结来获得L1_0有序的FePt纳米粒子。在毫巴范围内的极高压力下，通过使用直流溅射的惰性气体冷凝，可生成尺寸范围为3-20 nm的颗粒。在沉积之前，将颗粒在293和1273 K之间的温度下在气相中进行热烧结。主要通过（高分辨率）透射电子显微镜研究颗粒。取决于惰性气体压力和烧结温度，FePt纳米颗粒的形貌和结构发生巨大变化。在0.5毫巴下制备的FePt纳米颗粒没有团聚，因此具有非常小的尺寸分布，几何标准偏差σ_g= 1.1。使用p≥1.0 mbar的压力，我们观察到了颗粒的团聚和颗粒尺寸分布的变宽。虽然在p = 0.5 mbar时制备的颗粒在最高烧结温度为1273 K时显示二十面体结构，但在p> 0.5 mbar和高烧结温度（1273 K）下制备时，会形成具有L1_0有序的单晶颗粒。

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