GRYSTALLOGRAPHIC EVALUATION OF MESOSCOPIC PARTICLES FORMED BY FGE-TECHNIQUE

（1）非典型Sb纳米粒子的晶体化过程的速率常数的时间依赖性Amorphopus Sb纳米粒子是由FGE技术在以下条件下形成的，即6.9 m/s的Ar气流速和1.7 kPa的气体压力。这些粒子被收集在仿形碳薄膜上。两种类型的退火在真空中携带（a）预退火在70个C，在150个C，在150个C，在各种持续时间内进行退火，（b）在150个C，在各种持续时间内进行退火。水晶化比率的时间依赖性是通过一个被忽视的物种的暗场电子显微镜图像进行调查的。晶体化比率Pc可以由以下等式编写（1）从第一顺序的同源反应的视点，Ln（1-Pc）=Rc·t （1）Rc表示晶体化比率常数的地方。在以上的情况下（b） Rc不保持恒定并显示每一个粒子大小的梯度下降。在另一边， Rc在（a）的情况下保持很长时间不变。更进一步， Rc分解与粒子大小D的降解，不同的特征在（a）和（b）两种情况下可以通过对非形态结构的放松来解释。（2）由FGE技术制成的纳米粒子的颗粒大小分布及其对纳米粒子的控制在其流速为6米/秒的情况下蒸发。粒子大小的分布适合一个高斯。粒子平均尺寸减少从9.5纳米到7.0纳米，蒸发温度从850 ℃ C到900 ℃ C，这种趋势可能会反映出一个关键的核尺寸。

(1)Time-dependence of rate constant for crystallization process of amorphous Sb nano-particlesAmorphopus Sb nano-particles are formed by the FGE technique under the following conditions as 6.9m/s of Ar gas velocity and 1.7kPa of the gas pressure. The particles are collected on amorphous carbon films. Two kinds of annealing are carried out in vacuum (a) pre-annealing at 70ﾟC for 6hs followed by the annealing at 150ﾟC for various durations and (b) annealing at 150ﾟC for various durations without preannealing. Time-dependence of crystallization ratio was investigated through the dark field electron microscopic image of annealed specimens. Crystallization ratio Pc can be written by the following equation (1) from the view point of homogeneous reaction of first order,Ln(1-Pc)=Rc・t (1)where Rc represents the rate constant of crystallization. In the case of above (b) Rc does not keep constant and shows a gradual alowing down of crystallization in every particle size. On the other hand, Rc keeps constant for long time in case of (a). Furthermore, Rc decreases with the decrease of the particle size D.The different feature shown in two cases of (a) and (b) can be explained by a reluxation of amorphous structure.(2)Particle size distribution and its control of nano-particles formed by FGE techniqueAntimony was evaporated in the flowing He gas with the velocity of 6m/s. Particle size distribution fits satisfactorily a Gaussian. Mean particle size decreases from 9.5nm to 7.0nm with increasing of evaporation temperature from 850ﾟC to 900ﾟC.This tendency may reflect a critical nucleus size.