Flash-sintering is similar to field-assisted sintering, except the applied current is alternative current [52]. In flash-sintering, there is a possibility of lithium loss due to crystal structure breakdown, which makes the technique unsuitable for densification of solid electrolytes. Stoldt and coworkers applied flash sintering on a LAGP (Li1.5Al0.5Ge1.5(PO4)3) electrolyte with a high frequency electric field.