کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7903469 | 1510460 | 2013 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Investigation of the phase transition of Ge2Sb2Te5 films using internal friction method
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
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چکیده انگلیسی
The phase transition of Ge2Sb2Te5 has been studied by internal friction measurement. Two Qâ 1 peaks were observed during the process of heating amorphous Ge2Sb2Te5 from room up to 400 °C. With a heating rate of 5.5 °C/min, the first peak (P1) is located at 180 °C and the second peak is (P2) located at 330 °C. Only the peak P1 appears when sample has been beforehand annealed at 230 °C for 1 hour. Both the peaks P1 and P2 don't appear when sample has been beforehand annealed at 380 °C for 1 hour. The positions of P1 and P2 are both affected by the heating rate, and they follow Kissinger relation. The activation energy corresponding to the peak P1 is 1.94 ± 0.18 eV, and the activation energy corresponding to the peak P2 is 3.49 ± 0.24 eV. The isothermal annealing experiment revealed that Qâ 1 monotonously decreases with time t in the process of phase change, and the internal friction Qâ 1 versus time t can be represented as Qâ 1(t) = Qâ 1(â) â [Qâ 1(â) â Qâ 1(0)] exp (ât/Ï). The characteristic time Ï is affected by temperature, and lnÏ increase linearly with Tâ 1.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Non-Crystalline Solids - Volume 378, 15 October 2013, Pages 139-143
Journal: Journal of Non-Crystalline Solids - Volume 378, 15 October 2013, Pages 139-143
نویسندگان
D.Z. Hu, D.H. Fan, F.M. Pan, J.Y. Fan,