A high-temperature X-ray diffraction study of the NiO–Li₂O system

A crystallographic study of the system Ni²⁺_1−2xNi³⁺_xLi⁺_xO has been carried out. The crystal structure of the material in the range 0≤x≤0.4 at room temperature and up to 1000°C has been studied. The principal coefficients of thermal expansion and the phase diagram are given. The structural rhombohedral → face-centred cubic transition temperature of NiO has been determined.