Study on Micro Morphology of Potassium Dihydrogen Phosphate Crystals Grown at Elevated Temperatures

Potassium dihydrogen phosphate crystals were grown around 65 °C. The growth rate of KDP (KH2PO4) crystal prismatic faces was measured by laser polarization interference system. The surface micro morphology of KDP crystals grown at various supersaturation were comparatively observed by atomic force m...

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Bibliographic Details
Published in:Crystals (Basel) 2017-04, Vol.7 (4), p.118
Main Authors: Li, Weidong, Wang, Shenglai, Ding, Jianxu, Yu, Guangwei, Wang, Duanliang, Huang, Pingping, Liu, Hui, Gu, Qingtian, Xu, Xinguang
Format: Article
Language:English
Subjects:
Aspect ratio
Bunching
Crystal growth
Crystal surfaces
High temperature
KDP crystals
Morphology
Pits
Potassium phosphates
Supersaturation
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Summary:Potassium dihydrogen phosphate crystals were grown around 65 °C. The growth rate of KDP (KH2PO4) crystal prismatic faces was measured by laser polarization interference system. The surface micro morphology of KDP crystals grown at various supersaturation were comparatively observed by atomic force microscope systematically. The results show that the growth rate increased with the rise of supersaturation, the aspect ratio reduced. The steps bunching height occurred at σ = 0.03 and 0.04. At this point, the steps height reached maximum value about 11.3~24.4 nm. The step bunching was almost constant at higher supersaturation. A few pits and holes appeared on the crystal surface at high supersaturation. In our opinion, the forming of these pits and holes might be related with the step movement and 2D nuclei mechanism.
ISSN:2073-4352
2073-4352
DOI:10.3390/cryst7040118