高等学校化学学报

高等学校化学学报 ›› 2005, Vol. 26 ›› Issue (2): 213.

• 研究论文 • 上一篇    下一篇

锌蒸气的氧化行为与氧化锌的结晶形貌

陈艺锋1,2, 彭长宏2, 唐谟堂2   

  1. 1. 湖南冶金职业技术学院,株洲412000;
    2. 中南大学冶金科学与工程学院,长沙 410083
  • 收稿日期:2004-07-14 出版日期:2005-02-10 发布日期:2005-02-10
  • 通讯作者: 陈艺锋(1963年出生),男,博士,副教授,主要从事精细冶金研究.E-mail:yefengc63@sina.com E-mail:yefengc63@sina.com
  • 基金资助:

    国家自然科学基金(批准号:50234010)资助

Oxidation Behavior of Zinc Vapor and Crystalline Morphologies of ZnO

CHEN Yi-Feng1,2, Peng Chang-Hong2, TANG Mo-Tang2   

  1. 1. Hunan Metallurgical and Professional Institute, Zhuzhou 412000, China;
    2. School of Met allurgical Science and Technology, Central-South University, Changsha 410083, China
  • Received:2004-07-14 Online:2005-02-10 Published:2005-02-10

PDF (PC)

被引次数

13

摘要： 用热重法测定了不同气氛下锌蒸气的氧化动力学曲线,用扫描电镜跟踪观察分析了产物的结晶形貌,结果表明,氧化动力学遵守直线规律时,产物是无定形、颗粒状和单针状的ZnO;氧化动力学为抛物线规律时,产物是四针状或多针状的ZnO.动力学转变规律的原因是锌蒸气中气态锌原子与凝聚生成的锌液滴之间存在动态平衡,气态锌原子的氧化过程遵守直线规律;而锌液滴的氧化过程分为两个阶段,分别受收缩球状界面反应模型R3和三维扩散模型D4动力学控制,表观活化能分别为106.3～108.2和114.2～117.3kJ/mol;扩散过程实际上是锌原子通过氧化膜层由里向外扩散,扩散系数D=2.46～9.70×10-5cm2/s.

关键词: 锌蒸气, 锌液滴, 氧化行为, 氧化锌结晶形貌

Abstract: The kinetics of oxidizing zinc vapor in different atmospheres at an elevated temperature was determined by thermogravimetric analysis and the morphologies of products were examined by scanning electron microscopy. The results showed that the product morphologies were of amorphous, granular, needle-like ZnO when the kinetics progressed linearly and the morphologies of tetrapod and/or multipod-like ZnO appeared as the kinetics proceeded parabolically. The cause of the kinetics change was the coexistence of atomized zinc and tiny zinc droplets formed in zinc vapor under proper conditions. The kinetics advanced linearly as the atomized zinc was oxidized while the kinetics followed the interface reaction R3 and Ginstling-Brounstein D4 model with apparent activation energy of 106.3108.2 kJ/mol and 114.2-117.3 kJ/mol respectively in the early and later stages of the zinc droplets oxidation. The oxidation process of the tiny zinc droplets is controlled by the outward diffusion of Zn through the oxidation scale and the diffusion coefficient D=2.46×10-5-9.70×10-5 cm2/s.

Key words: Zinc vapor, Zinc droplets, Oxidation behavior, ZnO crystalline morphologies

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