Crystallization kinetics of the tungsten-tellurite glasses

Celikbilek M., ERSUNDU A. E., Solak N., Aydın S.

JOURNAL OF NON-CRYSTALLINE SOLIDS, cilt.357, sa.1, ss.88-95, 2011 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 357 Sayı: 1
  • Basım Tarihi: 2011
  • Doi Numarası: 10.1016/j.jnoncrysol.2010.09.012
  • Dergi Adı: JOURNAL OF NON-CRYSTALLINE SOLIDS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.88-95
  • İstanbul Teknik Üniversitesi Adresli: Evet

Özet

The crystallization kinetics of the (1 - x)TeO(2)-xWO(3) (where x=0.10, 0.15, and 0.20, in molar ratio) glass system was studied by non-isothermal methods using differential scanning calorimetry (DSC), X-ray diffraction (XRD) and scanning electron microscopy (SEM) techniques. DSC measurements were performed at different heating rates to study crystallization kinetics of the first crystallization reactions of the glasses. XRD analysis of tungsten-tellurite glasses heat-treated above the first crystallization temperatures revealed that the first crystallization peaks attributed to the alpha-TeO(2) and gamma-TeO(2) crystalline phases for 0.90TeO(2)-0.10WO(3) and 0.85TeO(2)-0.15WO(3) samples and alpha-TeO(2) and WO(3) crystalline phases for the 0.80TeO(2)-0.20WO(3) sample. Avrami constants. n, calculated from Ozawa equation, were found between 1.14 and 1.44. The activation energies, E(A), for the first crystallization reactions were determined by using the modified Kissinger equation as 379 kJ/mol, 288.1 kJ/mol and 228.8 kJ/mol, for 0.90TeO(2)-0.10WO(3), 0.85TeO(2)-0.15WO(3) and 0.80TeO(2)-0.20WO(3) glasses, respectively. (C) 2010 Elsevier B.V. All rights reserved.