Kinetic studies on the tungsten tellurite glasses

M. Çelikbilek*, A. E. Ersundu, N. Solak, S. Aydin

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Özet

The crystallization kinetics in the TeO2-WO3 glass system was studied by non-isothermal methods using DSC, XRD and SEM techniques. Three glasses (1-x)TeO2 - xWO3 (x = 0.10, 0.15 and 0.20 mol) were selected for the kinetic investigations. Thermal analyses were performed at different heating rates to study the crystallization kinetics of the glasses in terms of the crystallization mechanism and the activation energy. The values of the Avrami constant, n, and the numerical factor of crystallization mechanism, m were calculated as 1 from the Ozawa equation by using both constant and increasing number of nuclei which indicate the formation of surface crystallization for all samples. The activation energies calculated from the modified Ozawa equation were found to be 372 kJ/mol, 285 kJ/mol and 230 kJ/mol for as-cast 0.90TeO2-0.10WO3, 0.85TeO 2-0.15WO3 and 0.80TeO2-0.20WO3 glasses, respectively, while the EA value of the prenucleated 0.80TeO2-0.20WO3 glass was calculated as 257 kJ/mol.

Orijinal dilİngilizce
Ana bilgisayar yayını başlığıMaterials Science and Technology Conference and Exhibition 2010, MS and T'10
Sayfalar146-155
Sayfa sayısı10
Yayın durumuYayınlandı - 2010
EtkinlikMaterials Science and Technology Conference and Exhibition 2010, MS and T'10 - Houston, TX, United States
Süre: 17 Eki 201021 Eki 2010

Yayın serisi

AdıMaterials Science and Technology Conference and Exhibition 2010, MS and T'10
Hacim1

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???event.eventtypes.event.conference???Materials Science and Technology Conference and Exhibition 2010, MS and T'10
Ülke/BölgeUnited States
ŞehirHouston, TX
Periyot17/10/1021/10/10

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