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Bulk samples of nearly-pure 2234-phase Tl 2 Ba 2 Ca 3 Cu 4 O 12 were synthesized near the melting point from starting compositions of either Tl 2 Ba 2 Ca 3.3 Cu 4 O z or Tl 2 Ba 2 Ca 4 Cu 5 O z . Well crystallized 'clusters' of 2234-phase Tl 2 Ba 2 Ca 3 Cu 4 O 12 were also prepared by melting the starting material Tl 2 Ba 2 Ca 4 Cu 5 O z . The 2234-phase samples prepared in the present experiment exhibit T c ( rho =0) up to 119 K.
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Chen et al. (1993) studied this question.
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