Abstract

High-temperature solutions of the K2O-P2O5-TiO2 system have been investigated and the concentration region and temperatures of spontaneous crystallization of KTiOPO4 (KTP) are determined. The dynamic viscosity, density, volumetric expansion coefficient and volatility of a series of solutions in the crystallization region of KTP are measured. On the basis of the data obtained on these properties, a new composition of the solvent for the preparation of KTP single crystals by crystallization from high-temperature solutions is proposed. In comparison with the usual K2O-P2O5 solvents, the new composition allows the preparation of solutions with a much higher concentration of KTP and a lower volatility.

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