Abstract
Measurements of electrical conductivity (DC) and dielectric constant (10 kHz) in freshly prepared single crystals of NiSO 4 · 6 H 2O and NiSO 4 · 7 H 2O have been carried out in the temperature range 30–450°C. It has been observed that the conductivity and dielectric constant show a large increase and decline at 100, 142, 186 and 360°C in the case of NiSO 4 · 6 H 2O and 125, 210 and 365°C in the case of NiSO 4 · 7 H 2O crystals. The effect of melting is very well seen in the conductivity and dielectric measurements in the case of NiSO 4 · 7 H 2O crystals where a large but broad peak is observed between 45 and 115°C. The observed changes in conductivity and dielectric constant at the deaquation temperature have been explained on the basis of the release of water molecules at the respective deaquation temperatures and the subsequent dissociation of a fraction of these released water molecules into H + and OH − ions. Availability of these charged particles increase the conductivity whereas the formation of space charge increases the dielectric constant.
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