کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1483851 1510513 2009 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Structural characterization and phase transformation kinetics of Se58Ge42−xPbx (x = 9, 12) chalcogenide glasses
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Structural characterization and phase transformation kinetics of Se58Ge42−xPbx (x = 9, 12) chalcogenide glasses
چکیده انگلیسی

The glass transition behavior and crystallization kinetics of Se58Ge42−xPbx (x = 9, 12) have been investigated using Differential Scanning Calorimetry (DSC) at five different heating rates under non-isothermal conditions. It has been observed that these glassy systems exhibit single glass transition and double crystallization on heating. The XRD pattern revealed that the considered glasses get crystallized into GeSe2 and PbSe/Se phases after annealing at 633–643 K for 2 h. The GeSe2 and Se phases were found to crystallize in monoclinic structure while, PbSe phase crystallizes in cubic structure. Besides this, a mixed phase was also observed in DSC thermograms after annealing. The kinetic studies include determination of various parameters such as Avrami exponent (n), frequency factor (Ko), dimensionality of growth (m), the activation energy for glass transition (Et) and for crystallization (Ec). The values of Et increases while that of Ec decreases after annealing. Also, dimensionality of growth decreases to one dimension from two and three dimensions after annealing.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Non-Crystalline Solids - Volume 355, Issues 22–23, 15 July 2009, Pages 1274–1280
نویسندگان
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