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Zn/ZnO晶枝结构的合成与生长机制

发表时间:2009-11-30  浏览量:1270  下载量:490
全部作者: 臧春雨,臧春和,贾志旭,方世杰,司振君,王新伟
作者单位: 长春理工大学材料科学与工程学院;洛阳理工学院数理部
摘 要: 通过热蒸发Zn粉的方法获得具有层状结构的Zn晶枝沉积物,其子分枝也具有相同的结构和形状,每个亚微米尺寸的子分枝由无数规则的六角形纳米盘构成,这些纳米盘沿着3个晶轴方向蔓延生长,并连接在一起形成晶枝的主干和分支。在O2气氛下退火,通过热氧化方法形成Zn/ZnO的核壳结构。晶枝的形态不仅由结晶学和热力学性质决定,也涉及晶体生长的动力学,连同热量和质量传输的影响,晶枝的生长是一个凝固潜热释放的过程。还研究了Zn的晶枝生长以及ZnO螺旋位错的成核与生长机制。
关 键 词: 无机非金属材料;ZnO;晶枝结构;生长机制
Title: Synthesis and growth mechanisms of Zn/ZnO dendritic structures
Author: ZANG Chunyu, ZANG Chunhe, JIA Zhixu, FANG Shijie, SI Zhenjun, WANG Xinwei
Organization: School of Materials Science and Engineering, Changchun University of Science and Technology;Department of Mathematics and Physics, Luoyang Institute of Science and Technology
Abstract: Zinc deposits with dendritic frameworks were obtained by thermal Zn powder method. The zinc dendrites were composed of submicron-sized branches with the same shape and structure, and each submicron-sized branch was made up of numerous nanodisks with a regular hexagonal shape. The nanodisks crept along the three crystal axis orientations and fused together to form the stems of zinc dendrites. By thermal oxidation, Zn/ZnO core-shell structures were formed. The shapes of the dendrites were not only decided by crystallographic and thermodynamic properties, the crystal growth kinetics should be also considered, as well as the effect of the quantity of heat and mass transport. The dendritic growth process was a release process of the latent heat of solidification. The nucleation and growth mechanisms were also investigated, such as 2D growth mechanism including face diffusion and step growth mechanisms, as well as 1D linear growth mechanism.
Key words: non-metallic inorganic material; ZnO; dendrites structure; growth mechanism
发表期数: 2009年11月第22期
引用格式: 臧春雨,臧春和,贾志旭,等. Zn/ZnO晶枝结构的合成与生长机制[J]. 中国科技论文在线精品论文,2009,2(22):2427-2430.
 
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