摘要
采用气相氧化法,在温度850～950℃,氧分压≤8%,气体总流量300～330 L/h的条件下,用工业锌粉为原料直接氧化制备出多针状氧化锌。SEM显示产物的中心体直径10～15μm,针状体直径0.2～0.8μm,针长60～100μm,XRD分析检测表明产物具有完整的六方纤锌矿型晶体结构。改变制备条件,可在一定范围内对多针状氧化锌的微观形貌和尺寸进行调控。半宽峰分析表明,随着氧分压的降低,半宽峰有所展开,表明晶体的缺陷增加,晶体缺陷主要是氧空位。
At controlled conditions of temp. 850-950℃, oxygen partial pressure ≤8%, and total gas flow rate 300- 330 L/h, multipod-like ZnO powders were directly prepared by vapor phase oxidizing zinc powders. Examined via X- ray diffraction and scanning electron microscope, the products have a shape of formation with multipods of length 60- 100μm and diameters 0.2- 0.8μm, extruding from the center body of diameter of 10- 15μm. It was found by XRD determination that the crystal structure of the products is perfect hexagonal wurtzite crystal. The length of the mutipods increased with the decrease of the oxygen partial pressure when other conditions remained unchanged, and the FHMW of products widened with the decrease of oxygen partial pressure, which indicates the concentration of oxygen vacancies in the crystal increased.
出处
《金属材料与冶金工程》
CAS
2008年第1期15-18,36,共5页
Metal Materials and Metallurgy Engineering
基金
湖南省计划科技项目(06FJ3173)
关键词
工业锌粉
气相氧化
制备
多针状氧化锌
zinc powders
vaporphase oxidation
preparation
multipod-like ZnO
