Electrical properties of BaSnO₃ in substitution of antimony for tin and lanthanum for barium

Abstract

Polycrystalline materials of BaSn_1−xSb_xO_3−δ and Ba_1−yLa_ySnO_3−δ were prepared. Substitutional solubilities of antimony for tin and lanthanum for barium, respectively, in BaSnO₃ were obtained to be x=0.18 for BaSn_1−xSb_xO_3−δ and y<0.052 for Ba_1-yLa_ySnO_3−δ. The X-ray photoemission spectroscopy measurements showed the valence of antimony and tin is mixed in our samples of BaSn_1−xSb_xO_3−δ. At lower temperature, magnetic susceptibilities of BaSn_1−xSb_xO_3−δ and Ba_1−yLa_ySnO_3−δ satisfy the Curie law, indicating the existence of non-interacting localized electrons at the Sn⁴⁺ site, and forming a Sn⁴⁺+e⁻ state in these systems. By substitution of antimony and lanthanum in BaSnO₃, the conductive properties are semiconductor-like. To explain this conductive behaviour, three types of mechanism were taken into consideration.