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A new phase, consisting of an ordered intergrowth (2457) between the superconducting structures TlBa 2 Ca 2 Cu 3 O 8.5+or-y and TlBa 2 Ca 3 Cu 4 O 10.5+or-y has been synthesized with lattice parameters a=3.848 AA and c=34.95 AA. The 2457 phase is observed as a substantial constituent of single thallium layer Tl-Ba-Ca-Cu-O superconducting compositions calcined for periods greater than 40 hours.
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Ogborne et al. (1992) studied this question.
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