کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1483711 | 1510545 | 2006 | 4 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Contribution of floppy modes to configurational and excess entropy in chalcogenide glasses
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله

چکیده انگلیسی
In this work, following Naumis' ideas [G.G. Naumis, Phys. Rev. B 61 (2000) R9205], we include the floppy modes as a free energy in order to obtain the configurational and excess entropy as well as the jump of the heat capacity of the chalcogenide glasses as function of the coordination number ãrã. Theoretically, we find that Sex/Sc ranges from 1.5 for strong liquids (ãrã = 2) to 2 for fragile ones (ãrã = 2.4). These results are consistent with the values reported by Angell and Borick [C.A. Angell, S. Borick, J. Non-Cryst. Solids 307&310 (2002) 393], who find experimentally for selenium, ãrã = 2, Sex/Sc = 1.47. The proportionality between the configurational and total excess entropies supports the non-existence of the Adam-Gibbs equation paradox. Finally, using Sc in the Adam-Gibbs equation we obtain a VFT-like equation as function of ãrã, predicting that when ãrã increases, D decreases as well, as it has been seen in previous work.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Non-Crystalline Solids - Volume 352, Issues 50â51, 1 December 2006, Pages 5399-5402
Journal: Journal of Non-Crystalline Solids - Volume 352, Issues 50â51, 1 December 2006, Pages 5399-5402
نویسندگان
Leonardo Dagdug, L.S. GarcÃa-ColÃn, Patricia Goldstein,