Abstract
A new series of superconducting thallium cuprates of nominal composition, (Tl 2− x Cu x )Ba 2CaCu 2O 8 (0<x<1.0), where copper seems to substitute for thallium in Tl2212, is reported. These materials, which are synthesized at 920K-1120K in sealed silver tubes, exhibit T c s in the range 110-99K. The phases are metastable, decomposing at higher temperatures (≈1150K) to a mixture of thallium cuprates, CuO and BaCuO 2. Significantly, x=1 member decomposes at 1150K to mixture of Tl2223, CuO and BaCuO 2. Chemical titrations involving oxidation of bromide ions reveal that the copper substituting for thallium in (Tl 2− x Cu x )Ba 2CaCu 2O 8 most likely occurs in the III oxidation state for x≤0.25 and in a mixed state (II, III) state for x>0.25.
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