Fig. 3: Pre-work of hydrothermal bulk crystal growth.
From: Hydrothermal growth of KTiOPO4 crystal for electro-optical application

Before growing crystals by hydrothermal method, the following four tasks should be done first: measuring the solubility (different temperatures, different solutions, and different pressures); select appropriate temperature and temperature difference; select an autoclave to meet the crystal growth requirements; determine the presence and type of liner according to the situation