Investigation of Kinetics of crystallization Processes of S15-Se85, S15-Se81-Cu4 Chalcogenide glasses

International Conference on Advances in Materials and Manufacturing Applications 2016

Samudrala, Kavitha^1 ; Devarasetty, Suresh Babu^1

Department of Physics, Osmania University, Hyderabad, India^1

关键词: Chalcogenide glass;    Crystalline phasis;    Crystallization process;    Crystallization temperature;    Experimental techniques;    Kauzmann temperature;    Kinetics of crystallization;    Melt quenching techniques;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/149/1/012176/pdf
DOI  :  10.1088/1757-899X/149/1/012176

来源: IOP

【 摘 要 】

In the present work, S15-Se85, S15-Se81-Cu4chalcogenide glasses are prepared by using conventional melt quenching technique. The as-prepared samples are studied by experimental techniques like X-ray Diffraction (XRD), Differential Scanning Calorimetry (DSC). XRD studies have confirmed that the as-prepared samples are amorphous in nature. It is clear from DSC studies that the as-prepared samples are glassy in nature. Kinetic analysis of the crystallization process of as-prepared glasses is carried using DSC curves. Activation energy for glass transition and Activation energy for crystallization are determined using Kissinger method. Activation energy for glass transition of S15-Se85and S15-Se81-Cu4glasses is found to be 84.5076 and 275.801 KJ/Mole respectively. Activation energy for crystallization of S15-Se85glass is found to be 106.2622 KJ/Mole for 1st peak while Activation energy for crystallization of S15-Se81-Cu4glasses is found to be 97.93 KJ/Mole for 1st peak and 84.20 KJ/Mole for 2nd peak. Kauzmann temperature (Tk) is determined from the heating rate dependent glass transition and crystallization temperatures. Tk value for S15-Se85glass sample is 236.680K (1st peak) and for S15-Se81-Cu4is 283.530K (1st peak) and 286.330K (2n peak). Avrami Index (n) is also determined for as-prepared glasses. Avrami Index (n) value for S15-Se85glass sample is 1.8 (1st peak) and for S15-Se81-Cu4is 2.9 (1st peak) and 1.4 (2nd peak). The crystalline phases by thermal treatment of as-prepared glasses are identified using XRD patterns.