Electronic structure and O vacancy formation/migration in La0.825(Mg/Ca/Ba)0.125CoO3 Salawu Omotayo Akande, Li-Yong Gan and Udo Schwingenschlögl EPL, 114 2 (2016) 26001 Published online: 05 May 2016 DOI: 10.1209/0295-5075/114/26001