Perovskite solid electrolytes for SOFC.

摘要

We have synthesized a new series of brownmillerite solid electrolyte phases Ba(sub 2)GdIn(sub 1-x)Ga(sub x)O(sub 5) (x = 0,0.2,0.4) with the x = 0.2 phase exhibiting an unusually low E. relative to both the observed ionic conductivity in this phase and to E(sub a)s observed in similar compounds. We attribute measured ionic conductivities to a lack of available charge carriers in Ba(sub 2)GdIn(sub 0.8)Ga(sub 0.2)O(sub 5). However, the low E(sub a) supports the premise that brownmillerite solid electrolyte structures are suitable for supporting high ionic conductivity. Current work is focusing on enhancing the amount of charge carriers in these materials by systematically introducing disorder into the brownmillerite lattice.