The effects of the substitution for Cu or Mn by either a magnetic (Ni) or a nonmagnetic (Zn) 3d metal on the physical properties of the superconducting compounds ${\mathrm{Bi}}_{1.2}$${\mathrm{Pb}}_{0.8}$${\mathrm{La}}_{0.5}$${\mathrm{Sr}}_{1.5}$${\mathrm{CuO}}_{6+\mathit{y}}$ and of the antiferromagnetic insulating phases ${\mathrm{Bi}}_2$${\mathrm{Sr}}_2$${\mathrm{MnO}}_{6+\mathit{y}}$ and ${\mathrm{BiPbSr}}_2$${\mathrm{MnO}}_6$, all isostructural to the 10-K superconducting ${\mathrm{Bi}}_2$${\mathrm{Sr}}_2$${\mathrm{CuO}}_{\mathit{z}}$ (2:2:0:1) phase, have been investigated with use of x-ray powder diffraction, susceptibility, and resistivity measurements. We found that both Ni and Zn substitute for Cu and Mn with a range of solubility strongly dependent upon the nature of both the dopant and the host compound. For instance, in the Cu-based compounds the range of solubility is only a few percent (5% for Ni and 2% for Zn) whereas in the Mn-based compounds the range of solu- bility can be extended up to 20% for Zn or 30% for Ni. In the superconducting ${\mathrm{Bi}}_{1.2}$${\mathrm{Pb}}_{0.8}$${\mathrm{La}}_{0.5}$${\mathrm{Sr}}_{1.5}$${\mathrm{Cu}}_{1\mathrm{-}\mathit{x}}$${\mathit{M}}_{\mathit{x}}$${\mathrm{O}}_{6+\mathit{y}}$ system, both Ni and Zn depress the ${\mathit{T}}_{\mathit{c}}$ at approximately the same rate (8 K/mol %), so that the magnetism of the dopant has no effect on the ${\mathit{T}}_{\mathit{c}}$ as observed for the other high-${\mathit{T}}_{\mathit{c}}$ cuprates. The Mn-based materials order antiferromagnetically and we found that upon substitution by Ni and Zn the antiferromagnetic transition temperature ${\mathit{T}}_{\mathit{N}}$ decreases less dramatically for the magnetic Ni [5 K/(10 at. %)] than for the nonmagnetic Zn [30 K/(10 at. %)]. A consideration of the exchange interactions can account for these results.

• Received 16 July 1990

DOI:https://doi.org/10.1103/PhysRevB.43.5481