THE EFFECT OF THE IN-SITU SUBLIMATION IN THE GROWTH OF HGI(2) PLATELETS FROM VAPOR

The quality of HgI2 platelets grown from the vapour phase has been stu died, varying different growth parameters, i.e. starting material, add ition of polyethylene, source/crystallisation temperature, in-situ sub limation. It has been found that the in-situ sublimation at high tempe rature is the essential factor for the production of HgI2 platelets. T his in-situ sublimation was made in the same growth ampoule at tempera tures over 200-degrees-C and prior to the growth process. All the othe r 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.