高纯ZnAl_2O_4纳米颗粒的制备及其微结构分析

将机械力化学与超声波化学相结合制备出高纯度、结晶性良好的尖晶石型ZnAl_2O_4纳米颗粒。分析了样品的表面形貌、晶体结构及微观结构。研究结果表明:当焙烧温度为600~900℃时,ZnO与γ-Al_2O_3固相反应制备出高纯度、结晶性良好的尖晶石型ZnAl_2O_4纳米颗粒。随着焙烧温度的升高,材料的致密度增大,结晶度提高,平均孔径依次增大,比表面积明显下降,孔隙率降低。

Preparation and Microstructure Analysis of High-purity ZnAl2O4Nanoparticles

High-purity ZnAl2O4 spinel nanoparticles with good crystallinity were synthesized through the combining method of mechanochemistry and sonochemistry.The features including surface morphology,crystal structure,chemical components and microstructure of the samples were characterized by powder X-ray diffraction (XRD),scanning electron microscopy (SEM),transmission electron microscopy (TEM) and specific surface area analyzer (BET).The results indicate that ZnAl2O4 nanoparticles with high purity and good crystallinity are obtained by the solid state reaction of ZnO and γ-Al2O3 nanoparticles as the roasting temperature from 873K to 1173K.With the increase of the roasting temperature,the density of the material is enhanced,the crystallinity and the average pore size increase,and the specific surface area and the porosity decrease.