원문정보
초록
영어
Yttrium-Doped Barium Zirconate (BZY20) powders were synthesized by the solution combustion method, using two different fuels (urea and citric acid). The ignition of the reagent mixture with urea takes a longer time and the maximum temperature is higher than using citric acid. The theoretical calculations of exothermic heat and adiabatic flame temperatures indicate favorable conditions for combustion to occur. X-ray diffraction patterns showed formation of only perovskite phase for the samples synthesized with both of fuels. The crystallite sizes are in the range of 24-28 nm, with smaller values when citric acid was used as fuel. Scanning electron microscopy showed the presence of small agglomerates, formed by fine particles of different shapes and the size of BZY20 nanoparticles obtained using citric acid (30– 35 nm) was so smaller and more uniform than those obtained using urea (40-50 nm), and their BET surface areas are 30.9 and 20.57 m2/g, respectively. calcination is an essential step for a good crystallization of perovskite pure phase, which result showed 1150 oC for 5 h.
목차
1. Introduction
2. Experimental Procedure
2.1. Powder Preparation
2.2. Thermodynamic Calculations
2.3. Characterization
3. Results and Discussion
3.1. Thermodynamic Calculations
3.2. Effect of Calcinasion Temperature
3.3. Effect of Fuel Composition
3.4. Particle Size and Specific Surface Area
3.5. SEM Observations
4. Conclusions
References