Phase transformation studies on pure and K-doped Na2SO4

Abstract

Phase transformation studies on pure Na2SO4 revealed four phases only; phase IV was not observed.Electrical conductivity measurements have been made on polycrystalline undoped and K-doped Na2SO4 and on single crystals of undoped Na2SO4. Kinetic measurements on II → III transformation in undoped Na2SO4 show rate of conversion to be time independent and inversely related to temperature.The presence of K in Na2SO4 effects a lowering of both the transition temperature and the enthalpy of transition along with an alteration from the "athermal" kinetic behavior to first-order kinetics.