Bi2-ZPbzSr2-x(La/Nd)xCuOy (z=0 and 0.4, x=0.2-1.0) was synthesized in air and nitrogen atmosphere. Valence analyses by dichromate titration and iodometry showed Bi valence larger than 3.0 and Cu valence close to 2+ over the wide range of x, being difficult to explain superconductivity. The Tc depends on substituent lanthanoid, La or Nd. The maximum Tc was achieved at x=0.4-0.5 in all these series.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering