کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1811362 | 1025593 | 2011 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Observation of phase separation in some Se-Te-Sn chalcogenide glasses
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Differential scanning calorimeter (DSC) and X-ray diffraction (XRD) techniques were employed here to investigate the glass transition behavior and crystallization kinetics of Se80âx Te20Snx (x=0.0, 2.5 and 5) alloys, which were prepared by the conventional melt quenching method. Two exothermic peaks have been observed in the DSC scans for the samples that contain Sn. Three crystalline phases (Se7.68Te0.32, SnSe and SnTe) were classified after heat treating the Se77.5 Te20Sn2.5 glass at temperature corresponding to the second crystallization peaks for 3Â h. All the characteristic temperatures such as glass transition temperature (Tg), crystallization temperature (Tc) and crystallization peak temperatures (Tp) were found to depend on both the heating rate and the composition. This dependence has been used to deduce the activation energy of the glass transition (Eg), the activation energy of crystallization (Ec), the Avrami exponent (n), thermal stability and the fragility index (Fi).
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica B: Condensed Matter - Volume 406, Issue 5, 1 March 2011, Pages 1053-1059
Journal: Physica B: Condensed Matter - Volume 406, Issue 5, 1 March 2011, Pages 1053-1059
نویسندگان
Fouad Abdel-Wahab,