Nanomaterials science has shown a growth potential to use small particles with tunable properties to unique properties when compared to micro and macro scales materials, also known as bulk materials. The magnesium aluminate, or spinel (MgAl₂O₄), when sintered under specific temperature and pressure conditions, becomes mechanically resistant and transparent to certain wavelengths between ultraviolet and infrared. Despite its military and aerospace applications, spinel production with these properties may be costly, because of the exceptionally high pressures needed in the Spark Plasma Sintering (SPS) process in order to densify and keep the grain size into the nano domain. A well succeeded strategy to produce a resistant and transparent spinel is to synthesize nanoparticles doped with Li⁺ ions, which has been shown to be effective in promoting spinel densification. This work deals with the understanding of segregations and sintering of the doping ions segregated at the nanoparticles surfaces and grain boundaries, two high energy regions that exists in great number in polycrystalline nanomaterials. In order to deepen this knowledge, the kinetics of dopant segregation in different stages of sintering will be studied, seeking to understand how the decreasing of surfaces energies contributes to the densification process and nanostability control.