In situ investigation of BaBPO5 crystal growth mechanism by high-temperature Raman spectroscopy

High-temperature Raman spectroscopy has been applied to investigate in situ the solution structure near the BaBPO5 crystal-solution interface. The experimental results show that [P2O7] and [BO4] are the basic structural units in BaBPO5-Li4P2O7 high temperature solution, and [BPO7] is the main growth unit of BaBPO5 crystal. In the crystal growth boundary layer, the [P2O7] and [BO4] units are transformed into [BPO7] unit. BaBPO5 crystal growth process is considered as a connection process of growth unit [BPO7] along c axis direction. According to the mechanism, the growth habits of BaBPO5 crystal can be predicted.