Abstract
The ferroelectricity in the crystal obtained by the evaporation of aqueous solution of N(CH3)4HSO4 has already been reported by us. Recently, by the thermo-gravity analysis, it was found that most of the crystals are the hydrated crystal N(CH3)4HSO4·H2O containing one molecule of water of crystallization and that some crystals contain only about 0.3 molecule. The latter crystals are considered to be mixture of the hydrated crystal and the completely anhydrous one N(CH3)4HSO4, which has not been obtained yet. The hydrated crystal undergoes phase transitions at -104°C and around 40°C, and the completely anhydrous crystal can be said to show transitions around -70, -42, 42 and 129°C. The former shows the ferroelectricity in the temperature range from -104°C to about 40°C and the latter seems to show also the ferroelectricity in nearly the same temperature range.
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