Hiệu ứng tương quan trong khuếch tán Al2O3 lỏng

• Tác giả: Thế Vinh La, Thị Thanh Hà Nguyễn, Khắc Hùng Phạm
• Ngôn ngữ: vie
• Ký hiệu phân loại: 666.1 Glass
• Thông tin xuất bản: Khoa học và Công nghệ các trường đại học kỹ thuật, 2014
• Mô tả vật lý: 80-85
• Bộ sưu tập: Metadata
• ID: 505555

Tóm tắt

The diffusion mechanism at atomic level in AI2O3 liquid is studied by molecular dynamics simulation. The authors track the evolution of network units with x=4, 5 and 6 over different time. The simulation shows that the diffusivity of aluminum particle is performed via the transitions AlOx ' AlOx+/-1. The diffusion coefficient depends strongly not only on the rate of the exchanging the coordinated oxygens, but also on the correlation effect. This effect is caused by the specific distribution of the exchanging coordinated oxygens (EGO) through the space which leads to spatially heterogeneous dynamics in the liquid. The dynamical slowdown near glass transition point has been studied and disc4ssed.