四脚状氧化锌晶须的生长习性及机理的研究  

STUDY ON GROWTH HABITS AND MECHANISM OF TETRAPOD-LIKE ZnO WHISKERS

作　　者：陈尔凡[1] 田雅娟[1] 程远杰[1] 周本廉[2] 

机构地区：[1]沈阳化工学院材料科学与工程系,沈阳110021 [2]中国科学院沈阳金属研究所,沈阳110015

出　　处：《硅酸盐学报》2001年第2期151-156,共6页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金!重点资助项目 (5 94310 40 );辽宁省自然科学基金!资助项目 (9810 30 10 0 3)

摘　　要：以锌粉为原料 ,白碳黑为催化剂 ,研究了四脚状氧化锌 (T -ZnO)晶须在高温气相氧化反应条件下的结晶习性和生长机理 .扫描电镜研究结果表明 :模板催化剂及气相反应体系的过饱和度对T -ZnO晶须形态有很大影响 .利用T -ZnO晶须生长习性温和的特点 ,制备了均一规整的T -ZnO晶须 .通过生长过程的观察 ,在一定生长环境中T -ZnO晶须为开裂晶须 ,表现为轴螺旋位错的VS生长机理 .This paper deals with the growth habits and the mechanism of tetrapod-like zinc oxide (T-ZnO) whiskers, which were prepared by vapor phase oxidation of zinc metal in the air and by introducing white carbon black as a modeling catalyst. The morphology of T-ZnO whiskers is affected greatly by white carbon black and supersaturation ratio (the fractional pressures of zinc vapor and pressed air), which are affected by the growth temperature and air amount. The growth habits of T-ZnO whiskers are middle. The further research of the reactive region of vapor phase show that the growth also relies on the diffusion and equilibrium of the reactive system. The growth process of T-ZnO whiskers is that Zn reacts with oxygen in vapor-phase to form regular octahedral crystal nucleus, and then crystal grows on four alternating interfaces. The legs are triangle initially and then become hexahedron gradually. The regular T-ZnO whisker is prepared with high yield by using the middle property of the whiskers growth. T-ZnO whiskers belong to cleaving whiskers, which has been verified by studying the growth process. The growth of T-ZnO whiskers shows the VS growth mechanism of screw dislocation.

关 键 词：氧化锌 四脚状晶须 生长习性 晶须形态 生长机理 

分 类 号：TQ343.4[化学工程—化纤工业]