Recent advances in the study of O-deficient perovskite and brownmillerite phases, as O ion conductors, were reviewed with respect to the structures of these phases and the role which O vacancies played with respect to the ionic conductivity of these materials.

K.R.Kendall, C.Navas, J.K.Thomas, H.C.Zur Loye: Solid State Ionics, 1995, 82[3-4], 215-23