TY - JOUR
T1 - Thermal properties and crystallization behavior of some TeO2-K2O glasses
AU - Öz, B.
AU - Kabalci, I.
AU - Öveçoǧlu, M. L.
AU - Özen, G.
PY - 2007
Y1 - 2007
N2 - The effect of K2O content on the crystallization of binary TeO2-K2O glasses was investigated. Glasses with compositions of (1 - x)TeO2-xK2O (where x = 0.05, 0.10, 0.15, in molar ratio) were prepared. DTA curves in the temperature range of 25-700 °C with the heating rate of 10 °C/min were used to determine the thermal properties such as glass transition temperature (Tg), crystallization peaks (Tp), and melting temperature (Tm). Crystallization peaks ranging between 364 and 421 °C were detected on the DTA scans. DTA results revealed that the most stable glasses were formed with the modifier concentrations near the eutectic composition, 0.10 mol. Crystallizing phases and microstructural morphology for each composition were characterized by XRD and SEM. On the basis of XRD measurements, α-TeO2 (paratellurite), γ-TeO2 and K2Te4O9 (potassium tetratellurite) phases were detected. The K2Te4O9 phase is present in all three glasses, due to the fact that this phase arises because of a phase separation melting of the glass.
AB - The effect of K2O content on the crystallization of binary TeO2-K2O glasses was investigated. Glasses with compositions of (1 - x)TeO2-xK2O (where x = 0.05, 0.10, 0.15, in molar ratio) were prepared. DTA curves in the temperature range of 25-700 °C with the heating rate of 10 °C/min were used to determine the thermal properties such as glass transition temperature (Tg), crystallization peaks (Tp), and melting temperature (Tm). Crystallization peaks ranging between 364 and 421 °C were detected on the DTA scans. DTA results revealed that the most stable glasses were formed with the modifier concentrations near the eutectic composition, 0.10 mol. Crystallizing phases and microstructural morphology for each composition were characterized by XRD and SEM. On the basis of XRD measurements, α-TeO2 (paratellurite), γ-TeO2 and K2Te4O9 (potassium tetratellurite) phases were detected. The K2Te4O9 phase is present in all three glasses, due to the fact that this phase arises because of a phase separation melting of the glass.
KW - Glass
KW - Microstructure
KW - Thermal properties
UR - http://www.scopus.com/inward/record.url?scp=33751019421&partnerID=8YFLogxK
U2 - 10.1016/j.jeurceramsoc.2006.04.143
DO - 10.1016/j.jeurceramsoc.2006.04.143
M3 - Article
AN - SCOPUS:33751019421
SN - 0955-2219
VL - 27
SP - 1823
EP - 1827
JO - Journal of the European Ceramic Society
JF - Journal of the European Ceramic Society
IS - 2-3
ER -