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Optical and atomic force microscopic study on step bunching in BaB_2O_4 crystal growth

Optical and atomic force microscopic study on step bunching in BaB_2O_4 crystal growth
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摘要 The formation of macrostep during high-temperature phase of barium meta-borate (^-BaB204) single crystal growth has been investigated by both optical in-situ observation system and atomic force microscopy (AFM). The in- si$u observation results demonstrate that the critical linear size of growing facet exceeding the size that the macrostep generates is significantly anisotropic. The critical linear sizes are around 280 ~m and 620 ~m for {1010} and (T010} planes, respectively. AFM study illustrates that macrostep train with a height of 150 nm^200 nm is one typical morphological feature of the as-grown crystal surface. The riser of each macrostep consists of several straight and parallel sub-steps, indicating the occurrence of step bunching. Additionally, triangular sub-steps with heights of several nanometers on the treads of the macrosteps are found to be another typical feature of surface morphology, which implies a microscopically competitive bunching of sub-steps between various crystallographic orientations. The formation of macrostep during high-temperature phase of barium meta-borate (^-BaB204) single crystal growth has been investigated by both optical in-situ observation system and atomic force microscopy (AFM). The in- si$u 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 ~m and 620 ~m for {1010} and (T010} 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.
出处 《Chinese Physics B》 SCIE EI CAS CSCD 2011年第2期517-520,共4页 中国物理B(英文版)
基金 supported by the Young Scientists Fund of the National Natural Science Foundation of China (Grant No. 50802105)
关键词 step bunching optical in situ observation atomic force microscopy BaB2O4 crystal step bunching, optical in situ observation, atomic force microscopy, BaB2O4 crystal
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