Abstract
Modification induced by thermal treatments in different gaseous environments (nitrogen, helium, and oxygen), on the 2223 phase formatted in two BI(?B)SrCaCuO systems, were investigated by the microwave methods DMA (direct microwave absorption) and MAMMA (magnetically modulated microwave absorption). Si1.7Pb0.3Sr2Ca2Cu3Oy and Bi1.7Pb0.3Sr2 Ca2.5Cu3.5Oy systems were obtained by different preparation techniques, and as a result they exhibit small differences in the canon stoichiometry that affect the oxygen stoichiometry and their change under the same annealing conditions. The changes observed were attributed to the oxygen variation around the optimum concentration and. further the deviation of the oxygen content from this optimum value reduces the critical temperature of the 2223 phase.
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