TY - GEN
T1 - Kinetic studies on the tungsten tellurite glasses
AU - Çelikbilek, M.
AU - Ersundu, A. E.
AU - Solak, N.
AU - Aydin, S.
PY - 2010
Y1 - 2010
N2 - 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.
AB - 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.
KW - Crystallization kinetics
KW - Glasses
KW - TeO - WO system
UR - http://www.scopus.com/inward/record.url?scp=79952692479&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:79952692479
SN - 9781617820328
T3 - Materials Science and Technology Conference and Exhibition 2010, MS and T'10
SP - 146
EP - 155
BT - Materials Science and Technology Conference and Exhibition 2010, MS and T'10
T2 - Materials Science and Technology Conference and Exhibition 2010, MS and T'10
Y2 - 17 October 2010 through 21 October 2010
ER -