Abstract
Accurate measurements of some electrical properties combined with the differential thermal analysis (DTA) were made from room temperature up to 200°C for single crystals of KHSO 4 (KHS). The data reveal the existence of two (non-ferroelectric) phase transitions around 100°C and 175°C. The first structural phase transition may involve only minor change in atomic positions and therefore it is not easy to detect. The existence of this phase is confirmed by the X-ray diffraction pattern. The data are correlated with the arrangement of the molecules in the unit cell including the hydrogen bonding system due to the two distinct HSO 4 ions as well as the onset of the reorientational motion of the sulphate group.
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