Effect of pH Value on Preparation of La2CuO4 Microcrystallites Synthesized by Sol-Gel Process

摘要：

　　La2CuO4 crystallites were prepared via a sol-gel process using lanthanum nitrate and cupric nitrate as raw materials,distilled water as solvent,citric acid as complexing agent and ammonia to control the pH value.The as-prepared La2CuO4 crystallites were characterized by XRD,FESEM,TEM and UV-Vis spectra.Results show that the crystallization property of La2CuO4 crystallites increases firstly and then decreases with increasing of the solution pH value from 1.0 to 2.5,but all of the samples exhibit single sphere-like morphology.It is found that when the solution pH value is controlled at 2.0,the grains display uniform distribution and the size ranges from 100nm to 120nm after sintering at 600℃ for 2 hours.The optical band gap of the as-prepared La2CuO4 crystallites was calculated to be 1.38eV.

关键词： La2CuO4 PH value Sol-Gel process

作者: LI Yi-feng HUANG Jian-feng CAO Li-yun WU Jian-peng

作者单位: Key Laboratory of Auxiliary Chemistry & Technology for Chemical Industry,Ministry of Education,Shaanxi University of Science & Technology,Xian Shaanxi,710021,China

会议类型: 国际会议

会议名称: The Seventh China International Conference on High-Performance Ceramics (第七届先进陶瓷国际研讨会(CICC-7))

会议地点: 厦门

会议语种:英文

页码: 231-234

在线出版日期: 2011-11-04（万方平台首次上网日期，不代表论文的发表时间）