تفاصيل الوثيقة

نوع الوثيقة : مقال في مجلة دورية 
عنوان الوثيقة :
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
 
الموضوع : فيزياء 
لغة الوثيقة : الانجليزية 
المستخلص : 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. 
ردمد : 0925-8388 
اسم الدورية : Journal of Alloys and Compounds 
المجلد : 509 
العدد : 5 
سنة النشر : 1432 هـ
2011 م 
نوع المقالة : مقالة علمية 
تاريخ الاضافة على الموقع : Sunday, February 5, 2012 

الباحثون

اسم الباحث (عربي)اسم الباحث (انجليزي)نوع الباحثالمرتبة العلميةالبريد الالكتروني
أحمد عبدالله الغامديAl-Ghamdi, Ahmad AباحثدكتوراهAGAMDI@kau.edu.sa
محمد اختر علويAlvi, Mohammad Akhtarباحثدكتوراهalveema@hotmail.com
شمشاد أحمد خانKhan, Shamshad Ahmedباحثدكتوراهshamshad_phys@yahoo.com

الملفات

اسم الملفالنوعالوصف
 32172.pdf pdfAbstract

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