Abstract
New cuprates with nominal composition were synthesized by solid state reactions in . The crystal structure was characterized by x-ray powder diffraction as tetragonal. Dc electrical resistance and ac magnetic susceptibility measurements were applied to check the existence of superconductivity in these cuprates. Superconductivity with up to 73 K is observed in the range . Synthesis in is found to be necessary for obtaining superconductivity in these cuprates. Preparation in air or post-treatment in flowing oxygen destroys superconductivity. Comparison with previous Pb-based 1212 superconducting oxides is made. The valence of Pb and the possible position of Mo in the lattice are discussed.
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