Study of Glass Transition and Crystallization Behavior in Ga15Se85 - xPbx (0 ≤ x ≤ 6) Chalcogenide Glasses |
| Z.H. Khana, S.A. Khan b and M.A. Alvic
aDepartment of Applied Sciences & Humanities, Faculty of Eng. & Technology, Jamia Millia Islamia, (Central University), New Delhi, India bDepartment of Physics, St. Andrew's College, Gorakhpur, UP 273001, India cDepartment of Physics, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia |
| Received: September 26, 2011; Revised version: August 26, 2012; In final form: September 24, 2012 |
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| There has been a growing interest in the synthesis and characterization of amorphous chalcogenide glasses due to their importance in preparing electronic memories, grating, switching devices and their optical applications as good IR transmitting materials. The study of the glass transformations and crystallization processes in the amorphous systems is interesting not only from the fundamental aspect of establishing the reaction mechanism of crystal nucleation and growth, but also from a technological point of view. The present research work is concentrated on the study of glass transition and crystallization behavior in Ga15Se85 - xPbx with x=0, 3, and 6 chalcogenide glasses by differential scanning calorimetry. Their amorphous nature has been verified by X-ray diffraction. The differential scanning calorimetry experiments were performed at different continuous heating rates (5 to 25 K/min). The glass transition temperature (Tg) and crystallization temperature (Tc) of these glasses has been determined from differential scanning calorimetry thermograms. The dependence of Tg and Tc on the heating rate (β) has been used for the determination of different crystallization parameters such as the activation energy of crystallization (Δ Ec), the activation energy for structural relaxation (Δ Et) and the order parameter (n). The results of crystallization were discussed on the basis of different models such as Kissinger's approach and modification for non-isothermal crystallization in addition to Johnson, Mehl, Ozawa and Avrami. |
DOI: 10.12693/APhysPolA.123.80 PACS numbers: 61.43.Dq, 61.05.cp, 64.70.p, 64.70.dg, 65.60+a |