Synthesis, structure, and superconductivity of B-site doped perovskite bismuth lead oxide with indium

Abstract

Many elements can be doped into the A site of perovskite BaBiO3-based superconductors, but only Bi, Pb, Tl, Sb, Mg, and Na are found in the B site. Here, the successful synthesis of Ba(Bi0.25Pb0.75)1-xInxO3-δ superconductors by solid state reaction provides an example with indium located in the B site. The X-ray, neutron, and selected area electron diffraction data indicate that all the samples crystallize in the non-centrosymmetric space group P1 at room temperature. The superconductive transition temperature Tzeroc of Ba(Bi0.25Pb0.75)1-xInxO3-δ decreases with an increase of indium, which is attributed to the fact that the hole concentration in the samples departs from the optimal hole doping state of BaBi0.25Pb0.75O3-δ superconductor.