摘要
溅射金超微粒(AuUFP)的实验研究结果表明:AuUFP的凝聚和演化生长可分为近时域和远时域两个过程.前者超微粒尺寸与时间关系服从幂次规律;后者超微粒尺寸与时间关系服从对数规律.采用铁磁Ising模型和动态座逾渗模型分别模拟分析AuUFP的溅射凝聚和演化生长过程,探索了AuUFP产生与紧致生长动力学特性.
The growth of the gold ulrtrafine particles(GUFPs) on amorphouse silicon dioxide substrates has been measured,utilizing the X ray diffraction technique and transmission microscopy.The time dependence of GUFP growth about short and long time range is found.The growth kinetics for the short time range show a power law growth of the average particles size, R(t)=(t-t 0) α with α =0 044±0 004.For the long time range one can fit a logarithmic growth R(t)=β ln (t-t 0) with β =6 0±0 6.Using a Monte Carlo(MC) simulations,the growth kinetics of the spin flip Ising model and the dynamic percolation evolution for GUFPs are studied.System of size L =30,70,100,150 and 200 are studied at time t =0 by guenching from a high temperature semi ordered state,to a low temperature nonequilibrium state,and the time evolutions of GUFPs are simulated by the dynamic growth of a percolation cluster.It is shown that the GUFPs can fit an effective LCA growth law.
出处
《西南师范大学学报（自然科学版）》
CAS
CSCD
北大核心
1999年第2期167-172,共6页
Journal of Southwest China Normal University(Natural Science Edition)
