The effect of the in-situ sublimation in the growth of HgI2 platelets from vapour

The Quality of HgI₂ platelets grown from the vapour phase has been studied, varying different growth parameters, i.e. starting material, addition of polyethylene, source/crystallisation temperature, in-situ sublimation. It has been found that the in-situ sublimation at high temperature is the essential factor for the production of HgI₂ platelets. This in-situ sublimation was made in the same growth ampoule at temperatures over 200 °C and prior to the growth process. All the other growth parameters studied in this work influenced the quality of the platelets although they did not affect their production. Finally, the grown platelets have been characterised by optical observation and by differential scanning calorimetry.