PHASE EQUILIBRIA IN THE Li–Mn–Eu–O SYSTEM

Phase equilibria in the Li–Mn–Eu–O system were studied for the first time in the temperature range 700–1000°С, and a concentration diagram was plotted within the Li–Mn–Eu triangle at an oxygen partial pressure of 21 kPa. It is shown that the LiEuO₂–Li₂MnO₃ system is quasi-binary, unlike the sections LiEuO₂–LiMnO₂ and LiEuO₂–LiMn₂O₄. It has been established that, for spinel LiMn₂O₄ (Fd\(\bar {3}\)m), a homogeneous introduction of 2 mol % Eu is possible, while in the case of Li₂MnO₃ (C2/m), the single-phase state decays.