Abstract
(Bi 0.33Cd 0.67)Sr 2YCu 2O 7 − δ can be synthesized single phase by XRD, between 800 and 950 °C. It has a tetragonal structure, space group P4 mmm , and lattice parameters a = 3.802 A ̊ and c = 11.96 A ̊ . The Cd site can be fully replaced with an appropriate M II ion and the Y site can be chemically substituted up to 100% by lanthanide ions with ionic radii falling between those of Nd and Gd, with a measurable shift in a and c axis lattice parameters. As synthesized, (Bi 0.33Cd 0.67)Sr 2YCu 2O 7 − δ is semiconducting and paramagnetic down to 4 K. Superconductivity can be induced by a post-synthesis annealing in high pressure oxygen to give T c = 40 K . Thermopower measurements show that the material is underdoped with S 290k = 50 μVK −1. Introduction of extra charge carriers to raise T c by doping Ca on the Y site is not chemically possible with the synthesis techniques used.
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