Complete structural model for lanthanum tungstate: a chemically stable high temperature proton conductor by means of intrinsic defects

This is the first paper reporting that lanthanum tungstate, earlier believed to be La6WO12, is in fact La28-xW4+xO54+delta, where tungsten dissolves in lanthanum sites to form a stable solid-state electrolyte, exhibiting proton conduction by hydration at intermediate temperatures.