GROWTH OF MIXED KNCSH CRYSTALS FOR LARGE SUPERCOOLING OF WITHOUT SPONTANEOUS CRYSTALLIZATION IN SOLUTION.

Mixed K2NixCo(1x)(SO4)2 6H2O (KCNSH) crystals are promising materials for UVoptical filters of the solarblind spectral range 220 280 nm 1. One of the most important factors affecting the defect formation in a growing crystal is spontaneous crystallization in a supersaturated solution. Temperature and mechanical perturbations have a significant effect on the stability of a solution with respect to spontaneous nucleation. To reduce the influence of these disturbances, we have implemented a growing scheme in which the crystallizer with pretreated solution was installed in a thermostat with a temperature difference across the internal volume of no more than 1 C without forcing the solution to be mixed.