Thallium barium calcium copper oxide

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Thallium barium calcium copper oxide, or TBCCO (pronounced "tibco"), is a family of high-temperature superconductors having the generalized chemical formula Tl_mBa₂Ca_n−1Cu_nO_2n+m+2+δ.

Tl₂Ba₂Ca₂Cu₃O₁₀ (TBCCO-2223) has Tc of 127 K, discovered in 1988.

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http://books.google.co.uk/books?id=pj7WhbyqkxcC&pg=PA543&lpg=PA543&dq=tbcco&source=web&ots=s2VSdLRg2-&sig=_Dpgo2NJ4k9J8tDRy49_cG7zktM&hl=en