Abstract
The Nb substitution effect on structural, DC electrical resistivity, and AC susceptibility properties of polycrystalline Bi1.6Pb0.4Sr2Ca2Cu3Oδ samples is investigated. The behavior of weak link and intergranular coupling in the substituted samples is discussed. While the Bi-2223 phase concentration increases in the X-ray diffraction (XRD) pattern, the intragrain transition temperature remains nearly unchanged in the substituted samples. The intergrain transition temperature is changed with Nb substitution.
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