Microprobe of structure of crystal/liquid interface boundary layers

The molecular structures and its evolutive regularities within the boundary layers in the crystal growth of KDP and DKDP have been studied in real time by using holography and Raman microprobe. The experiments show that the molecular structure of mother solution within the boundary layers is distinc...

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Bibliographic Details
Published in:Science China. Technological sciences 2001-06, Vol.44 (3), p.265-273
Main Authors: Yu, Xiling, You, Jinglin, Wang, Yan, Cheng, Zhenxiang, Yu, Bingkun, Zhang, Shujun, Sun, Daliang, Jiang, Guochang
Format: Article
Language:English
Subjects:
Anions
Boundary layers
Cations
Crystal growth
Crystallization
Hydrogen bonds
Molecular structure
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Summary:The molecular structures and its evolutive regularities within the boundary layers in the crystal growth of KDP and DKDP have been studied in real time by using holography and Raman microprobe. The experiments show that the molecular structure of mother solution within the boundary layers is distinctly different from that of the solutions alone. In this paper, the effects of cations within the boundary layers on the structure of solution are considered. Within the characteristic boundary layers, the effects of cations cause the changes in O-P-O bond angle, electronic density redistribution of the phosphate groups, and significant changes in the bond intensity, thus leading to the breaking of partial hydrogen bonds of the phosphate associations, the readjustment of geometry of anionic phosphate groups and desolvation, and the forming of the smectic ordering structure of the anions-cations. Finally, the crystallization unit of anion-cation should be formed at the proximate interface.
ISSN:1006-9321
1674-7321
1862-281X
1869-1900
DOI:10.1007/BF02916703