Effect of on the growth and thermal properties of K2SO4 crystal

Abstract

Single crystals of pure and Cd 2þ -doped potassium sulfate were grown from aqueous solutions by the slow evaporation technique. From nutrient solutions with a CdSO 4 concentration of 4 wt% crystals containing 0.014 wt% dopant concentration could be obtained. The X-ray diffraction patterns of powdered crystals confirmed their crystal structures for both cases. Thermal analysis of pure crystals shows that the a-b phase transformation peak around 580 1C is superimposed with spurious effects, while for Cd 2þ -doped crystals this is not the case. The thermal hysteresis of the phase transition is 8 K for undoped K 2 SO 4 and is reduced to 3.5 K for K 2 SO 4 :Cd 2þ . Compared to undoped crystals, the optical transmittance of Cd 2þ -doped crystals is higher. r

Effects of Al2(SO4)3 and K2SiO3 Impurities on the Crystallization of K2SO4 from Aqueous Solution

“…[ 22 ] also explained the concentration and supersaturation effects on the impurity action of traces Fe (III) by using a proposed model, and found that the impurity effectiveness factor increased inversely proportional to the supersaturation as predicted by the model. Others studied the primary nucleation process and crystal growth process of K 2 SO 4 solutions in the presence of ionic impurities, [ 23,24 ] such as Cd 2+ , Sr 2+ , Ba 2+ , Ag + , Pb 2+ , and Ni 2+ .…”