中国物理B ›› 2000, Vol. 9 ›› Issue (5): 321-324.doi: 10.1088/1009-1963/9/5/001

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INFLUENCE OF SEED CRYSTAL DIMENSION ON CRYSTAL GROWTH FROM SOLUTION UNDER MICROGRAVITY

葛培文1, 许政一1, 朱振和2   

  1. (1)Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China; (2)Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China; Department of Physics, Central University for Nationalities, Beijing 100081, China
  • 收稿日期:1999-11-17 出版日期:2000-05-15 发布日期:2005-06-12

INFLUENCE OF SEED CRYSTAL DIMENSION ON CRYSTAL GROWTH FROM SOLUTION UNDER MICROGRAVITY

Zhu Zhen-he (朱振和)ab, Ge Pei-wen (葛培文)a, Xu Zheng-yi (许政一)a   

  1. a Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China; b Institute of Physics, Chinese Academy of Sciences, Beijing 100080, China; Department of Physics, Central University for Nationalities, Beijing 100081, China
  • Received:1999-11-17 Online:2000-05-15 Published:2005-06-12

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摘要： The influence of the dimension of seed crystal on the characteristics of crystal growth from solution under microgravity is studied. The dimensionless average velocity of fluid Vav, the dimensionless maximum velocity of fluid Vmax, the temperature distribution index Sθ, the concentration distribution index Sφ and the dimensionless average growth rate of crystal \overline{V}cg are calculated by only taking into account the variation of the solution density caused by the temperature change, that caused by the concentration change being neglected. In certain regions of the parameter (Ra, Pr,Sc and μ) space, some scaling laws are generated: the scales of Sφ and \overline{V}cg are given by power functions of μ with negative exponents. It is shown that the characteristics of crystal growth for small seed crystal are different from those for large seed crystal.

Abstract: The influence of the dimension of seed crystal on the characteristics of crystal growth from solution under microgravity is studied. The dimensionless average velocity of fluid Vav, the dimensionless maximum velocity of fluid Vmax, the temperature distribution index $S_{\theta}$, the concentration distribution index $S_{\phi}$ and the dimensionless average growth rate of crystal $\overline{V}_{\rm cg}$ are calculated by only taking into account the variation of the solution density caused by the temperature change, that caused by the concentration change being neglected. In certain regions of the parameter (Ra, Pr, Sc and $\mu$) space, some scaling laws are generated: the scales of $S_{\phi}$ and $\overline{V}_{\rm cg}$ are given by power functions of $\mu$ with negative exponents. It is shown that the characteristics of crystal growth for small seed crystal are different from those for large seed crystal.

中图分类号:  (Theory and models of crystal growth; physics and chemistry of crystal growth, crystal morphology, and orientation)

  • 81.10.Aj
81.10.Dn (Growth from solutions) 81.10.Mx (Growth in microgravity environments)