Solid solutions of Bi2S2-xMxCuO6±δ (MBi or Pb) were prepared with 0.1 ≤ x ≤ 0.5 for MPh and 0.2 ≤ x 0.5 for MBi. Both Pb and Bi are effective in stabilizing the 2201 phase, when substituted for Sr. However, the Pb substitution induces a pseudotetragonal to orthorhombic phase transition. Variation of the unit cell parameters and δ with x in Bi2Sr2-xPbxCuO6±δ suggest that Pb is in the PbIV formal oxidation state and appears to substitute at least partially for the Bi site. No evidence for superconductivity was observed for either substitutions in the "as prepared" samples, regardless of the value of x. However, annealing a sample of Bi2Sr1.9Pb0.1CuO6±δ in inert atmosphere showed the onset of superconductivity at ≈ 8 K.
All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering