关于单元体系Cu的玻璃转变过程中动力学不均匀性的研究  

Dynamic heterogeneity of the single-component system Cu in glass transition

作　　者：幸晓凤 孙永丽 王智聪 XING Xiao-Feng;SUN Yong-Li;WANG Zhi-Cong(College of Physics and Optoelectronics,Taiyuan University of Technology,Taiyuan 030024,China)

机构地区：[1]太原理工大学物理与光电工程学院,太原030024

出　　处：《原子与分子物理学报》2020年第1期153-156,共4页Journal of Atomic and Molecular Physics

基　　金：国家自然科学基金(11204200)。

摘　　要：基于分子动力学模拟技术,采用非高斯参数α2(t)来描述单元体系Cu的玻璃转变过程中动力学不均匀性的变化.研究表明在β弛豫阶段,非高斯参数α2(t)随时间的变化满足幂律函数,而非高斯参数峰值αmax和β弛豫时间τβ与温度的关系均符合Arrhenius函数,且温度越接近玻璃转变温度T g,体系的动力学不均匀性越明显.Based on the molecular dynamics simulation technique,the non-Gaussian parameterα2(t)is used to describe the change of dynamic heterogeneity during the glass transition of the single-component system Cu.The results show that the variation of non-Gaussian parameter α2(t)with time satisfies the power law function in β relaxation.The peak values of the non-Gaussian parameter αmax and the β relaxation time τβ are depending on temperature and satisfy Arrhenius function,and the closer the temperature to the glass transition temperature Tg,the more obvious the dynamic heterogeneity.

关 键 词：CU 玻璃转变 动力学不均匀性 非高斯参数 

分 类 号：O751[理学—晶体学]