Simulation of the Growth Conditions of Guanylurea Hydrophosphite Crystals

The results of computer simulation of the conditions for growing guanylurea hydrophosphite (GUHP) crystals from solution, including the temperature patterns of the outer walls of the thermostat and crystallizer, are reported. Qualitative features of the location of temperature minima and maxima in the volume of the growth unit for different methods of solution mixing in the crystallizer were revealed. The flow patterns in the crystallizer in dependence of the mixing method are shown. Based on the simulation results, the optimal GUHP growth regime was selected and bulk single crystals up to 90 × 35 × 15 mm3 in size were obtained. The features of their real structure have been studied by projection X-ray topography.