Measure of the KTP Crystals Solubility and Its Growth by Hydrothermal Method

The solubility of KTP crystals in K2HPO4+KH2PO4 aqueous solution was measured by the quenching-weighing method under the conditions of the filling level of the solution f=70% and the temperature T=400,450,500 and 550 ℃ respectively.It was found that the KTP crystals had a large solubility value and a large temperature coefficient in 2 mol/l K2HPO4+0.1 mol/l KH2PO4 solution while T≥450 ℃,which satisfied the conditions of KTP crystals grown by hydrothermal method.Besides the KTP crystals with the dimension up to 24×14×60 mm3 was gotten by hydrothermal method in 2 mol/l K2HPO4 + 0.1mol/l KH2PO4+1wt% H2O2 solution with f=70 % and T=470-520 ℃.