Document Details

Document Type : Article In Journal 
Document Title :
Non-isothermal crystallization kinetic study on Ga15Se 85-xAgx chalcogenide glasses by using differential scanning calorimetry
Non-isothermal crystallization kinetic study on Ga15Se 85-xAgx chalcogenide glasses by using differential scanning calorimetry
 
Subject : Physics 
Document Language : English 
Abstract : At different heating rates, the glass transition temperature (T g) and the crystallization temperature (Tc) are obtained from the non-isothermal differential scanning calorimetry (DSC) measurements of bulk Ga15Se85-xAgx (x = 0, 2, 4, 6 and 8) chalcogenide glasses prepared by melt quenching technique. Their amorphous state was verified by using X-ray diffraction (XRD) and scanning electron microscopy (SEM). It was observed that the glass transition temperature and crystallization temperatures both increase with increasing heating rates and also by increasing Ag concentration in Ga-Se system. The activation energy of crystallization (Ec), activation energy of glass transition (Eg), crystallization enthalpy (ΔHc) and the Avrami exponent (n) have been determined from the dependence of Tg and Tc on the heating rate (β). The obtained value of the n indicates that the volume nucleation with two dimensional growth is responsible for amorphous- crystallization phase transformation. On the basis of the obtained experimental data, the temperature difference (Tg - Tc) and the enthalpy released (ΔHc) are found to be maximum and minimum, respectively, for Ga15Se77Ag8 glass, which indicate that this glass is thermally most stable in the composition range under investigation. The crystallization kinetic study of Ga15Se 85-xAgx glass was studied by using the modified Kissinger and Ozawa equations. 
ISSN : 0925-8388 
Journal Name : Journal of Alloys and Compounds 
Volume : 509 
Issue Number : 5 
Publishing Year : 1432 AH
2011 AD 
Article Type : Article 
Added Date : Sunday, February 5, 2012 

Researchers

Researcher Name (Arabic)Researcher Name (English)Researcher TypeDr GradeEmail
أحمد عبدالله الغامديAl-Ghamdi, Ahmad AResearcherDoctorateAGAMDI@kau.edu.sa
محمد اختر علويAlvi, Mohammad AkhtarResearcherDoctoratealveema@hotmail.com
شمشاد أحمد خانKhan, Shamshad AhmedResearcherDoctorateshamshad_phys@yahoo.com

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