Bi(0.9)A(0.1)FeO(3)　(A　=　Ca,　Sr　and　Ba)　ceramics　are　synthesized　by　using　the　conventional　solid　state　reaction　method.　X-ray　diffraction　analysis　shows　that　all　the　ceramics　have　a　hexagonal　distorted　perovskite　structure　with　the　space　group　R3c.　It　is　found　that　A-site　substitution　with　the　smallest　ionic　radius　ions　Ca2+　among　(Ca2+,　Sr(2+)and　Ba2+)　effectively　suppressed　the　leakage　current.　The　oxygen　vacancies　increase　with　the　increase　of　the　doping　ionic　radius　of　the　divalent　cations　(Ca2+,　Sr2+　and　Ba2+)　in　Bi(0.9)A(0.1)FeO(3)　ceramics.　The　dependence　of　the　electric　field　on　the　leakage　current　is　systematically　illustrated　by　using　two　bulk-limited　conduction　mechanisms　(space-charge-limited　conduction　and　Poole-Frenkel　emission)　and　other　two　interface-limited　conduction　mechanisms　(Schottky　emission　and　Fowler-Nordheim　tunneling).　The　dependence　of　temperature　on　electrical　conductivity　and　the　XPS　measurements　illustrate　that　the　Fe2+　transport　behavior　could　be　mainly　responsible　for　the　electrical　leakage　behavior　of　BAFO　(A　=　Ca,　Sr　and　Ba)　ceramics.　(C)　2016　Elsevier　B.V.　All　rights　reserved.