pH值对Bi-YIG纳米颗粒尺寸的影响  

The Effect of pH Value on the Nano-Particle Size of Bi Substituted Yttrium Iron Garnet

作　　者：秋艳鹏[1] 张溪文[1] 韩高荣[1] 

机构地区：[1]浙江大学硅材料国家重点实验室,浙江杭州310027

出　　处：《稀有金属材料与工程》2006年第A02期190-193,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金资助(60077006)

摘　　要：用共沉淀法制备了铋掺杂的钇铁石榴石(Bi-YIG)纳米颗粒。选择pH值分别为9,10,11和12进行沉淀。通过透射电镜(TEM)观察纳米颗粒的大小、分布,以及前驱体的结构,发现颗粒的尺寸随着pH值的增大而减小,当pH为12时达到最小,粒径在10 nm左右;前驱体的结构在pH值等于9,10和11时成网络状,并随着pH值的增大网络越来越连续,当pH值等于12时前驱体为一个个分散的颗粒。通过对前驱体结构的分析,分别从热力动力学和胶体化学两方面推测了pH值对颗粒大小及尺寸影响的机理。对不同pH值下制备的Bi-YIG纳米颗粒做了X射线衍射(XRD),并分析了pH值对石榴石相合成的影响。Nano-particles of Bi substituted yttrium iron garnet were prepared by co-precipitation method, with the pH value being 9, 10, 11 or 12. The nano-particle size, size distribution and the structure of hydroxide precursor were observed with transmission electron microscope （TEM）. The TEM images show that the size of Bi-YIG grains decreases obviously and the distribution of the particles becomes symmetrical with the increase of pH value. When the pH value is 12, the particle size is the smallest, varying around 10 nm. And the structure of hydroxide precursor is kind of net when the pH value is 9, 10 and 11. In addition, the net structure becomes more integrated with the increases of pH value. But the hydroxide precursor becomes several dispersive particles when the pH value reaches 12. The mechanism of the effect of pH value on nano-particles is discussed by analyzing the hydroxide precursor. The Bi-YIG particles prepared at different pH values were tested with the X-ray diffraction （XRD）, and the influence of pH value to the synthesis of garnet phase was analyzed also.

关 键 词：YIG PH 共沉淀 纳米 磁光材料 

分 类 号：TB383.1[一般工业技术—材料科学与工程]