Tokuyama Michio
World Premier International Research Center, Advanced Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan.
Phys Rev E Stat Nonlin Soft Matter Phys. 2009 Sep;80(3 Pt 1):031503. doi: 10.1103/PhysRevE.80.031503. Epub 2009 Sep 11.
The slow dynamics of a single particle in multicomponent glass-forming systems including fragile and strong glasses is studied from a unified point of view. The simulation results on two different systems, bulk glass-forming Cu60Ti20Zr20 melt and network-forming SiO2 , melt are analyzed by the mean-field theory (MFT) recently proposed and are compared with other systems near the glass transition. It is shown that the simulation results for the mean-square displacement are all collapsed into a master curve given by MFT if a long-time self-diffusion coefficient has the same value in each system. It is also shown that each long-time self-diffusion coefficient is described well by a singular function predicted recently from first principles. Thus, we conclude that there exists a simple universal mechanism near the glass transition even among any diversely different glass-forming systems.
从统一的角度研究了多组分玻璃形成体系（包括脆性玻璃和强玻璃）中单个粒子的缓慢动力学。通过最近提出的平均场理论（MFT）分析了两种不同体系——块状玻璃形成Cu60Ti20Zr20熔体和网络形成SiO2熔体的模拟结果，并与玻璃转变附近的其他体系进行了比较。结果表明，如果每个体系中的长时间自扩散系数具有相同的值，那么均方位移的模拟结果都可以汇聚成由MFT给出的主曲线。还表明，每个长时间自扩散系数都可以由最近从第一原理预测的奇异函数很好地描述。因此，我们得出结论，即使在任何截然不同的玻璃形成体系之间，在玻璃转变附近也存在一种简单的通用机制。
