کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1483161 1645410 2009 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
On the influence of the initial liquid configuration on the structure of a glass obtained using ab-initio molecular dynamics simulations
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
On the influence of the initial liquid configuration on the structure of a glass obtained using ab-initio molecular dynamics simulations
چکیده انگلیسی

We describe the effect of the cooling rate on some structural properties of GeS2 chalcogenide glasses obtained using ab-initio molecular dynamics simulations. Quenches have been carried out using a linear velocity rescaling according to T(t) = T0 − γt where γ is the cooling rate. In the present paper we discuss the influence of the initial liquid configuration on the structure of the GeS2 glass. Structural properties of both liquid and glassy samples are compared. Furthermore a special attention is given to the total neutron structure factor. The decrease of the cooling rate appears in particular to improve the description of the medium range order of the glassy structure. The evolution of both intensity and position of the first sharp diffraction peak with the cooling rate also reveals that the influence of the initial configuration is very limited. Therefore our results confirm that in ab-initio molecular dynamics simulations as in experiment, the quench is the crucial step for structural changes between the liquid and the glassy phase.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Non-Crystalline Solids - Volume 355, Issues 37–42, 1 October 2009, Pages 1807–1810
نویسندگان
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