Abstract
Superconducting transition temperature (T c), hole concentration (n c), and crystal structure for Bi 1.7Pb 0.3Sr 2Ca 2Cu 3O y (2223) polycrystals and Bi 2Sr 2CaCu 2O y (2212) single crystals annealed in different atmospheres have been measured. It is found that the consequence of annealing in O 2 is mainly the modification of the oxygen in Cu O planes, which is different from that in N 2 where the change is in the Bi-O planes. The result provides a good explanation for the complicated changes of the T c with the annealing conditions.
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