制备参量对BaZrO₃：Ce纳米粉体形貌和发光性能的影响

来源期刊：金属学报2011年第1期

论文作者：李玉玲 马伟民 闻雷 温强 苑晓宇

关键词：BaZrO₃：Ce纳米粉体； 复合沉淀剂； 晶化； 光致光谱； 粉体形貌

Key words：BaZrO₃:Ce nano-powder； complex precipitation agent； crystallization； photoluminescence spectrum； powder morphology

摘    要：用湿化学共沉淀法制备了BaZrO₃:Ce纳米材料,采用XRD,TG-DTA及SEM分析了制备过程中物相的变化及特性,用荧光光度计分析了样品的发光光谱.研究了样品合成的热力学条件、发光性能与形貌的关系及液相因素.结果表明:在1000℃煅烧不同时间制备的BaZrOa:Ce纳米粉体的发光强度不同,掺杂0.7%Ce³⁺(摩尔分数)、煅烧3 h条件下获得的BaZrOa:Ce样品的发光强度最大,且激发光谱和发射光谱峰值分别对应247 nm波长和475—505 nm波长.最佳液相参数:母盐溶液起始浓度为0.04 mol/L;滴速2 mL/min;沉淀体系温度0℃;添加2%—3%(质量分数)的DBS时制备的BaZrO₃:Ce粉体,近球形,无团聚,粒径均匀约为20 nm.

Abstract: BaZrO₃:Ce nano-materials were synthesized by coprecipitation reaction under different conditions. XRD, SEM and TG-DTA were applied to analyze the changes of phase and characteristic of the powders during calcing process. The luminescence spectra of samples were analyzed by the fluorescence photometer. It is shown that BaZrO₃:Ce nano-materials calcined at 1000℃ for 3 h has the best luminescence property, especially the samples doped 0.7%Ce³⁺ (molar fraction) is optimal, and its excited spectrum is at 247 nm and emitted spectrum is from 475 nm to 505 nm. The best liquid conditions are that the initial concentration of mother liquor is 0.04 mol/L, containing 2%-3% (mass fraction) of DBS, the titration rate is 2 mL/min and the temperature is 0℃. The as-prepared powders are of well dispersed property and small average size of 20 nm.