| Title |
Analysis on Properties of TiO_2-Nb_2O_5 Sol |
| Keywords |
TiO_2-Nb_2O_5 Sol ; Sol-Gel Method ; Crystalline Properties ; Viscosity ; DTA Properties |
| Abstract |
[ TiO_2-Nb_2O_5 ] sol was prepared using sol-gel method. Crystalline properties of gel powder changed from rutile phase to anatase phase with increasing Nb_2O_5 additives at 800°C, while they retained rutile phase regardless of Nb_2O_5 additives at 900°C, 1,000°C. They retained amorphous phase from 50°C to 400°C, retained anatase phase from 500°C to 600°C and had rutile phase over 700°C at 1mole% Nb_2O_5 additive. After TiO_2-Nb_2O_5 sol retained low viscosity with normal chain structure for a long time, its viscosity increased fast with network structure. DTA properties of gel powder had endothermic reaction due to evaporation of propanol and water about 78°C, had exothermic reaction due to propanol combustion about 290°C and had exothermic reaction due to changing of TiO_2 phase about 640°C. |