Single crystals of pure and urea doped potassium sulphate were grown by slow evaporation technique. Single crystal XRD analysis confirms orthorhombic crystal structure. Powder XRD pattern confirms that the grown crystals posses high crystalline nature. Vibration spectrum reveals the symmetries of molecular vibrations. The TGA, DTA shows that the materials have very good thermal stability, The UV-Vis spectrum shows the transmitting ability of the crystal in the entire visible region. The dielectric constant and dielectric loss were calculated by varying frequencies at different temperature. The microhardness test reveals that the crystals possess very good mechanical strength
