Abstract

The equipment and procedure for measuring different characteristics of hygroscopic crystals in a temperature interval from −100 to +100°C 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 ɛ in the phase transition area of strongly hygroscopic crystals of ammonium pyroselenite (NH4)2Se2O5 and (ND4)2Se2O5 at about room temperature is given.

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