Stabilizing High-Temperature -Li₃PS₄ by Rapidly Heating the Glass

High-temperaturemetastable phases exhibit superior characteristicscompared to those of thermodynamically stable phases at room temperature.Although optimization of the compositions and crystallizations fromglasses contribute to the stabilization of metastable phases at roomtemperature, the stabilization of the high-temperature & alpha;-Li3PS4 phase is not yet reported. & alpha;-Li3PS4 was successfully stabilized at room temperature, insteadof the middle-temperature & beta;-Li3PS4 phase, via rapid heating to crystallize the Li3PS4 glass. The obtained electrolyte exhibited a high ionic conductivityof >10(-3) S cm(-1) at room temperature.The crystallization of the glass via rapid heatingovercame the thermodynamic limitations in the preparation of the metastablecrystals. Further development of materials via nonequilibriumstates should contribute to the design of high-performance materials.