Composition dependences of Tc, Jc, physical property and crystal structure of Bi1.8Pb0.3Sr2.0Ca0.9Y0.1Cu2.0−xMxOy (M = Zr, Zn) superconducting oxide

► We prepared Zn- and Zr-substituted Bi-2212 superconducting materials. ► Bi1.8Pb0.3Sr2.0Ca0.9Y0.1Cu1.95Zr0.05Oy showed maximum Tc, but Jc was low. ► Zr- and Zn-substitution for Cu site could control Carrier concentration. ► Crystal structure analysis suggests Zr substitution for Cu site. ► Cu-O2 plane became flatter by Zr substitution.