Raman study of lattice vibration modes and growth mechanism of KDP single crystals

摘要

The space group theoretical analyses and assignment of the lattice modes of the KDP crystal have been made, and the Raman spectra of their growth solution have been observed in different growth regions. The attention is focused on the analysis of the 912cm(-1) band arising from the H2PO4+ anions in the interface between the KDP crystals and their growth solution. This has been assigned to the asymmetrical stretching mode of the deformation P(OH), From these results, the growth units of KDP crystal has been concluded to be the dimers of H2PO4- anions. We consider that the result presented here is an important step towards the development of more complete crystal growth theories. [References: 18]