Equipment and Procedure for Measuring Physicochemical Properties of Hygroscopic Crystals

摘要

The equipment and procedure for measuring different characteristics of hygroscopic crystals in a temperature interval from -100 to +100℃ is described. A glass vacuum cuvette is placed into a massive metal vessel, the temperature of which may be varied over wide limits. The measured temperature dependence of permittivity 8 in the phase transition area of strongly hygroscopic crystals of ammonium pyroselenite (ND{sub}4){sub}2Se{sub}2O{sub}5 and (ND{sub}4){sub}2Se{sub}2O{sub}5 at about room temperature is given.