中国物理B ›› 2011, Vol. 20 ›› Issue (2): 28102-028102.doi: 10.1088/1674-1056/20/2/028102

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Optical and atomic force microscopic study on step bunching in BaB2O4 crystal growth

潘秀红, 金蔚青, 刘岩, 艾飞, 金飞, 解俊杰   

  1. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
  • 收稿日期:2010-05-10 修回日期:2010-09-15 出版日期:2011-02-15 发布日期:2011-02-15
  • 基金资助:
    Project supported by the Young Scientists Fund of the National Natural Science Foundation of China (Grant No. 50802105).

Optical and atomic force microscopic study on step bunching in BaB2O4 crystal growth

Pan Xiu-Hong(潘秀红)†, Jin Wei-Qing(金蔚青), Liu Yan(刘岩), Ai Fei(艾飞), Jin Fei(金飞), and Xie Jun-Jie(解俊杰)   

  1. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
  • Received:2010-05-10 Revised:2010-09-15 Online:2011-02-15 Published:2011-02-15
  • Supported by:
    Project supported by the Young Scientists Fund of the National Natural Science Foundation of China (Grant No. 50802105).

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摘要： The formation of macrostep during high-temperature phase of barium meta-borate (α-BaB2O4) single crystal growth has been investigated by both optical in-situ observation system and atomic force microscopy (AFM). The in-situ observation results demonstrate that the critical linear size of growing facet exceeding the size that the macrostep generates is significantly anisotropic. The critical linear sizes are around 280 μm and 620 μm for {1010} and {1010} planes, respectively. AFM study illustrates that macrostep train with a height of 150 nm ～ 200 nm is one typical morphological feature of the as-grown crystal surface. The riser of each macrostep consists of several straight and parallel sub-steps, indicating the occurrence of step bunching. Additionally, triangular sub-steps with heights of several nanometers on the treads of the macrosteps are found to be another typical feature of surface morphology, which implies a microscopically competitive bunching of sub-steps between various crystallographic orientations.

关键词: step bunching, optical in situ observation, atomic force microscopy, BaB2O4 crystal

Abstract: The formation of macrostep during high-temperature phase of barium meta-borate ($\alpha $-BaB$_{2}$O$_{4}$) single crystal growth has been investigated by both optical in-situ observation system and atomic  force microscopy (AFM). The in-situ observation results demonstrate that the critical linear size of growing facet exceeding the size that the macrostep generates is significantly anisotropic. The critical linear sizes are around 280 $\mu $m and 620 $\mu $m for {$10\overline 1 0$} and {$\overline 1 010$} planes, respectively. AFM study illustrates that macrostep train with a height of 150 nm$\sim $200 nm is one typical  morphological feature of the as-grown crystal surface. The riser of each macrostep consists of several straight and parallel sub-steps, indicating the occurrence of step bunching. Additionally, triangular sub-steps with  heights of several nanometers on the treads of the macrosteps are found to be another typical feature of surface morphology, which implies a microscopically competitive bunching of sub-steps between various crystallographic  orientations.

Key words: step bunching, optical in situ observation, atomic force microscopy, BaB2O4 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
68.08.De (Liquid-solid interface structure: measurements and simulations) 68.37.Ps (Atomic force microscopy (AFM))