fig4
Figure 4. Electrolytes with other structure types. (A) Oxides with An+1BnO3n+1 Ruddlesden-Popper structure; (B) Hexagonal perovskites with mixed hexagonal and cubic-packing layers; (C) Oxides with A2B2O5 Brownmillerite structure; (D) ReMO4 phase; (E) A2B2O7 oxides (F) Oxides with A10-xB6O26±δ apatite-type structure. Reproduced with permission from Fop et al.[49] Copyright 2021 Royal Society of Chemistry.
