Abstract
The bulk superconductor Tl 2Ba 2Ca 3Cu 4O 12 with T c (onset) above 112 K has been prepared and structure and chemical composition were examined by X-ray powder diffraction, analytical (EDX) and high resolution electron microscopy. Unit cell dimensions for the tetragonal cell determined by the least squares method are a = 3.853 (1) A ̊ , c=41.98 (3) Å. The transition temperature, T c, of the double layered Tl system increases with the number of Cu-O layers ( n) up to n = 3, while it turns down at n = 4.
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