کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1605702 1516218 2016 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effect of Sn additive on the structure and crystallization kinetics in Ge–Se alloy
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
Effect of Sn additive on the structure and crystallization kinetics in Ge–Se alloy
چکیده انگلیسی


• Glass and crystallization transitions in Ge20Se80−xSnx candidate for devices.
• The addition of Sn increases the tendency of Ge-Se alloy to crystallization.
• The glass forming ability and thermal stability increase as Sn decreases.
• The dimension of the crystals growth is one or two depending on the Sn content.

The structure of Ge20Se80−xSnx glassy alloys and crystallization phases are identified using the X-ray diffraction (XRD) and Scanning Electron Microscope (SEM). The glass transition kinetics and the crystallization mechanism of the system are studied using Differential Scanning Calorimeter (DSC) under non-isothermal condition. The results reveal that glass transition temperature (Tg) increases with increasing Sn content which is attributed to the increase in the coordination number. The increase of the glass transition activation energy (Eg) with increasing Sn content is attributed to the decrease in the internal energy of the system as Sn increases. The compositional dependence of both glass forming ability and thermal stability are studied. From the experimental data, the thermal stability parameter (S) is found to be maximum for Ge20Se78Sn2 alloy, which indicates that this alloy is thermally more stable in the composition range under investigation. The effect of composition on the crystallization mechanism is discussed using different kinetic models. The crystallization activation energy (Ec) decreases with increasing Sn. This is attributed to the addition of Sn increases the tendency of crystallization. The calculated values of Avrami exponent (n) indicates the crystallization process occurs in one-and two dimensions for Sn is less than or equals 12 at%, respectively.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 675, 5 August 2016, Pages 1–7
نویسندگان
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