乙醇/水混合溶剂沉淀制备纳米BaF_2及粒径控制  

Synthesis and Size Control for Nanocrystalline Barium Fluoride Powder by Precipitation in Ethanol/Aqueous Mixed Solvents

作　　者：吕燕飞[1] 吴希俊[1] 吴大雄[1] 

机构地区：[1]浙江大学材料与化工学院

出　　处：《无机化学学报》2007年第7期1174-1178,共5页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.59872031)资助项目。

摘　　要：采用水和乙醇混合溶剂沉淀的方法制备了不同粒径的BaF2纳米粉体。用XRD、TEM和FSEM表征了粉体的粒径和形貌。研究了陈化时间、水和乙醇的体积比对BaF2纳米粉体的粒径和形貌的影响。结果表明,随混合溶剂中乙醇含量升高,沉淀粒径减小。BaF2沉淀粒径的倒数和溶剂介电常数的倒数呈线性关系,据此关系可以控制BaF2纳米粉体的粒径。The BaF2 nanocrystaUine powders with different particle sizes were synthesized by precipitation in the ethanol-water mixed solvents. The particle size and morphology of BaF2 powder were characterized by TEM, FSEM and XRD. The influence of the aging time and the volume ratio of water to ethanol on the particle size and morphology of BaF2 powders were studied. The results indicate that the size of BaF2 powders decreases with increasing volume ratio of ethanol to water of mixed solvents. The particle size of BaF2 nano-powder could be controlled according to the linear relationship between the reciprocal of BaF2 particle size and the reciprocal of dielectric constant of mixed solvents.

关 键 词：BaF2 纳米粉体 粒径控制 混合溶剂 沉淀 

分 类 号：O614.2[理学—无机化学] TQ110.3[理学—化学]