“…It is evident from thermodynamics and experimental data that only Er 2 O 3 , BeO, Y 2 O 3 , Si 3 N 4 , BN, AlN, ThO 2 and MgO can be relatively stable to lithium and that is true at relatively high concentration of nonmetallic impurities in lithium [10,12,16,17]. Since lithium oxide is one of the most thermodynamic stable compounds unlike nitride, the ceramic materials based on nitrides are more preferable for their use in the lithium medium.…”