Hydrothermal process for the growth of single crystals with special optical properties and water mineraliser for

摘要

A hydrothermal process is disclosed for growing a crystal at MTiOXO4 wherein M is NH4, K, Rb and/or Tl or mixtures thereof with Cs and X is P and/or As, at elevated temperatures using a mineralizer comprising both M+1 and X+5 and an amount of F-0 effective to increase the solubility of MTiOXO4 in the mineralizer. Mineralizers containing F-1, M+1 and X+5 are disclosed wherein F-1 is present in an amount effective to increase the solubility of MTiOXO4 in the mineralizer and to provide a MTiOXO4 solubility of at least about 1% by weight at the operating temperature and pressure for the hydrothermal production.