Anomalous diffusion and non-monotonic relaxation processes in Ge-Se liquids

作者：Yildirim Can^*; Raty Jean Yves; Micoulaut Matthieu

来源：Journal of Chemical Physics, 2016, 144(22): 224503.

DOI：10.1063/1.4953077

We investigate the dynamical properties of liquid GexSe100-x as a function of Ge content by first-principles molecular dynamic simulations for a certain number of temperatures in the liquid state. The focus is set on ten compositions (where x <= 33%) encompassing the reported flexible to rigid and rigid to stressed-rigid transitions. We examine diffusion coefficients, diffusion activation energies, glassy relaxation behavior, and viscosity of these liquids from Van Hove correlation and intermediate scattering functions. At fixed temperature, all properties/functions exhibit an anomalous behavior with Ge content in the region 18%-22%, and provide a direct and quantitative link to the network rigidity. Published by AIP Publishing.

• 出版日期2016-6-14