Synthesis, Structure, and Properties of the Superconductor Ba KBiPb O.

The series of BaBi Pb O(0 ≤ y≤1) has been synthesized by high-temperature solid-state reaction. X-ray and selected area electron diffraction data indicate that BaBi Pb O(0 ≤ y≤ 0.88) crystallizes in space group P1 and BaBi Pb O (0.93 ≤ y≤1) crystallizes in space group Imma. The samples with the nominal formula BaBi Pb O( y = 0.70, 0.80, 0.90) shows superconductivity with transition temperature ( T) around 11 K. When BaBi Pb O (0 ≤ y≤0.80) was treated with KOH and KF at 450 C, the corresponding samples with the nominal formula Ba KBi Pb O (0 ≤ y≤ 0.80) were obtained, which shows superconductivity with T changing from 30 to 11 K. [ABSTRACT FROM AUTHOR]