Hydrothermal process for growing large crystals or crystal layers

摘要

In order to obtain large, high-quality crystals or crystal layers of a metal orthophosphate, in particular, GaPO4 or AlPO4, from a nutrient solution with the use of a seed plate, the proposal is put forward that in the initial phase of the growth process a seed plate of alpha-quartz ( alpha -SiO2) be introduced into the nutrient solution, and that fluoride ions (F-) be added to this solution, at least for formation of the primary crystal layer on the quartz seed plate.