ZnO-TiO2体系的固相合成与表征

以分析纯ZnO和TiO2粉体为原料，直接固相法制备钛酸锌粉体.利用X射线衍射（XRD）、扫描电镜（SEM）对粉体物相、形貌进行表征，采用热重-差热（TG-DTA）研究固相反应机理.结果表明：氧化物粉体最低反应温度为800℃，升高反应温度有利于Zn2TiO4相的生成，延长反应时间有利于六方相ZnTiO3生成.在800~900℃保温4 h获得平均粒径为0.3~0.5μm的球形钛酸锌粉体，该晶体生长过程为扩散机制控制，调整温度对产物形貌影响不大.

Solid-phase synthesis and characterization of ZnO-TiO 2 system

Zinc titanate ceramic powders were synthesized using ZnO and TiO2 as the starting materials by sol-id state reaction at the temperature range of 800~900 ℃ for 4 h. The reaction mechanism, microstructures and morphology were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and thermo-gravimetry -differential thermal analysis (TG-DTA). The results indicate that the reaction between the oxides starts at above 800 ℃, the cubic Zn2TiO4 phase forms easily by increasing the reaction temperature and the hexagonal ZnTiO3 phase obtains by prolonging the reaction time. The average particle size of zinc titanate spherical particles is about 0.3~0.5 μm, the growth process of which is controlled by diffusion and the influ-ence of adjusting reaction temperature on the morphology turns out to be small.