NEW HIGH-TC SUPERCONDUCTOR FAMILIES OF AG1-XCUXBA2CAN-1CUNO2N-Y AND CUBA2CAN-1CUNO2N+4-Y WITH TC-GREATER-THAN-116-K(3)

New high-temperature and nontoxic superconductor families of Ag1-xCuxB a2Ca(n-1)CunO2n+3-y with Tc = 117 K and CuBa2Can-1CunO2n+4-y with Tc = 116 K were discovered. These materials were prepared by the high-pres sue technique. The highest Tc was obtained for n = 4 i.e. Ag1-xCuxBa2C a3Cu4O11-y(Ag-1234) and CuBa2Ca3Cu4O12-y(Cu-1234) phases. Their struct ures were analyzed as a tetragonal structure for simplicity. The Ag-12 34 phase has the lattice parameters of a = 3.8635 Angstrom and c = 18. 111 Angstrom, while the lattice parameters of the Cu-1234 phase are a = 3.8557 Angstrom and c = 17.993 Angstrom. The Ag-based superconductor s have higher Tc and larger lattice parameters than the Cu-based for n = 3, 4, and 5. The relationships between the lattice parameter c and the number of CuO2 layers n are c = 8.5 + 3.2(n-1) (Angstrom) and c = 8.4 + 3.2(n-1) (Angstrom) for Ag and Cu-based superconductors, respect ively. The small CuO2-block spacing (8.5 and 8.4 Angstrom) of these fa milies suggests a lower anisotropic superconductivity than Hg- and Tl- based superconductor families. The occupation of Ag sites was analyzed .