Li 3 N is a structurally and compositionally-simple superionic conductor that has been widely studied . Li 3 N exhibits three crystalline phases: the α-phase (Figure ), the β-phase, and the γ-phase. The β-phase is thermodynamically stable below 300 K , which is wellbelow the suggested superionic transition temperature of 588 K < T s ≤ 678 K . The γ-phase is only stable at high pressure . We focus exclusively on α-Li 3 N here, which we will refer to as Li 3 N for simplicity.