The (001)-oriented BiFeO3 and SrRuO3 films were deposited onto SrTiO3 and

DyScO3 substrates to study oxygen-vacancy density as a function of cooling

oxygen pressure. During cooling of as-grown samples at up to 0.01Torr oxygen

pressure, SrRuO3 films decompose, BiFeO3 films can accommodate a significant

fraction of oxygen vacancies, SrTiO3 substrates acts as a sink for vacancies, and

DyScO3 substrates remaining largely unaffected by oxygen vacancies. These

phenomena can be explained according to the electronegativity of the different B site atoms, because changes in B-site ion valence played a key role in maintaining

charge equilibrium during oxygen vacancy production in many ABO3-type oxides.

Behavior of Oxygen Vacancies in BiFeO3/SrRuO3/SrTiO3(100) and DyScO3(100)

Heterostructures. G.L.Yuan, A.Uedono: Applied Physics Letters, 2009, 94[13],

132905