Abstract

• Single crystals of Nickel Potassium Sulphate Hexahydrate, NiK2(SO4)2.6H2O (NPSH) were grown by slow evaporation of saturated solution containing equimolar ratio of Nickel Sulphate Hexahydrate, NiSO4.6H2O, and Potassium Sulphate, K2SO4, salt powders. Structural analysis of the green colour crystal was investigated by XRD method. The crystal was characterized by simultaneous Thermogravimetric and Differential Thermal Analysis (TG-DTA) method to study the high temperature phases of dehydration and meeting of the crystal. Electrical conductivity with temperature of the crystal was investigated in the temperature range of 299 K – 653 K. Dehydration temperature (Tdehydration) of the crystal was determined from the (ln σ vs 1000/T) relationship. The activation energies of the crystal in the TTdehydration and TTdehydration regions were evaluated in this work.