Influence of water vapor pressure on the induction period during Li2SO4·H2O single crystals dehydration

► We study nucleation process during thermal decomposition of solid. ► 2 nucleation modes are considered as nuclei appear on crystal edges and faces. ► Nucleation on the edges is faster than on the faces. ► When the water vapor pressure is increased, nucleation on faces is delayed. ► Nucleation on edges withdraws when water vapor pressure is increased.