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物理学报. 2001, 50(10): 1970-1978.
doi: 10.7498/aps.50.1970.
二维合金系统的有序动力学研究
- 收稿日期: 2001-03-08
- 修回日期: 2001-04-20
- 刊出日期: 2001-05-05
摘要: 采用主方程方法在对概率近似下对三元fcc结构晶体在(001)方向的一个层面的有序无序动力学过程进行了研究.计算了长程序参量(LRO)和短程序参量(SRO)随时间的演化过程.在系统从完全无序态弛豫到平衡态的过程中存在各种瞬态有序相.瞬态相有着不同的特点,如序参量(LRO,SRO)瞬态相曲线形状不同等.产生它们的原因有不同的原子特征迁移时间、原子间最近邻和次近邻相互作用差异、短程相关性和长程相关性的差异对弛豫过程的影响.
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关键词:
- 对概率近似 /
- 瞬态有序相 /
- 长程序参量(LRO) /
- 长程相关性
English Abstract
KINETICS OF ORDERING FOR AN ALLOY SYSTEM IN A TWO DIMENSIONAL LATTICE
- Received Date:
08 March 2001
- Accepted Date:
20 April 2001
- Published Online:
05 May 2001
Abstract: The kinetics of ordering in a (001) deposition monolayer in fcc alloy system is investigated by means of the micromaster equation method in the pair approximation. The time evolutions of the long-range order (LRO) and short-range order (SRO) parameters are calculated. There are transient ordered states during the relaxation from the disordered state to the equilibrium state. The transient ordered states have various features are due to different characteristic times for the atomic migration, the different first- and second-nearest- neighbors interactions, the different influence of short-range correlation and long-range correlation on relaxation.
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