EFFECT OF HEATING RATE AND MOLAR RATIO OF CITRIC ACID TO METAL CATIONS ON THE THERMAL DECOMPOSITION OF DOPED Ba(Ce,Zr)O3 CERAMICS POWDER

摘要

Sample of Ba(Ce0.6Zr0.4)0.95Yb0.05O2.975 with different molar ratios of citric acid (CA) to ethylene glycol (EG) and metal cation (M+) were prepared by a citrate complexation method. Results of thermogravimetric analysis showed the lower thermal decomposition temperature (Ttd) for the sample with CA:EG:M+=1:2:3 was obtained at heating rate of 10 ℃ min-1.The Ttd value gradually increased as the applied heating rate was increased. At 10 ℃ min-1, there are 3 stages of weight loss profile in TG signal that are corroborated by 3 peaks in DTG signal. The lowest Ttd was obtained for the sample with CA:EG:M+=4:2:3. After calcined at 1100 ℃, all the samples almost formed perovskite-like phase with orthorhombic structure as shown by a Fourier Transform Infrared spectrometer and X-ray diffractometer.