摘要
采用草酸共沉淀法制备YBCO粉末,计算了不同pH值下草酸盐共沉淀粉末的沉淀率,并对制取YBCO前驱体粉末过程中的Ba（NO3）2-Y（NO3）3-Cu（NO3）2-H2C2O4-H2O体系进行热力学分析,采用XRD对制备的YBCO进行了分析计算。结果表明：溶液中不同草酸根离子浓度下各离子沉淀完全的最佳pH范围不同,当草酸浓度为0.1 mol·L^-1,pH为2～6时,溶液中离子的沉淀率达到99%以上。随着草酸根离子浓度增大,完全沉淀时,共沉淀液中各金属离子所需的pH值范围增大。热力学计算与试验结果吻合。草酸共沉淀法制备的YBCO粉末物相纯度高,杂质少,颗粒细小,平均粒径为35.4 nm。
The YBCO powders were prepared by oxalate co-precipitation process. The sedimentation rates of the YBCO precursor powder were calculated at different pH. The system of Ba（ NO3）2-Y（ NO3）3-Cu（ NO3）2-H2C2O4-H2O in the process of preparing YBCO powder was analyzed based on thermodynamic theory. XRD technology was carried out to analyze and compute the YBCO. The results showed that when the concentration of oxalate ions in the solution was different,the optimum pH range of metal ions which deposited completely was also different. When the concentration of oxalic acid was 0. 1 mol·L^-1 and the range of pH was from 2 to 6,the sedimentation rate of the YBCO precursor powder was more than 99%. As the concentration of oxalate ions increased,the optimum PH range of the metal ions which deposited completely also increased. The thermodynamic calculated results were well consistent with experimental results. The YBCO powders prepared by oxalate coprecipitation had high purity,less impurity and small particles. The average size of particles was 35. 4 nm.
出处
《中国稀土学报》
CAS
CSCD
北大核心
2014年第3期322-327,共6页
Journal of the Chinese Society of Rare Earths
基金
国家自然科学基金项目(51371077)资助
关键词
热力学
计算分析
YBCO
PH
稀土
thermodynamics
calculation and analysis
YBCO
pH
rare earths
