Why hole polaron formation on oxygen is limiting the Fermi level in Fe acceptor doped BaTiO${}_3$ under oxidizing conditions

Mohammad Amirabbasi, Emre Erdem, Denis Sudarikov +3

Oxidizing Fe-doped BaTiO${}_3$ is commonly expected to convert substitutional Fe${}^{3+}$ acceptors into formal Fe${}^{4+}$ centers. Yet, the experimentally accessible picture based on e…