Bi2−xPbxSr2Ca2Cu3Oy superconducting samples with 0<x<0·3 have been synthesized and characterized using X-ray powder diffraction.Tc and superconducting volume fraction have been measured using a.c. magnetic susceptibility, d.c. electrical resistivity as well as X-band microwave surface resistance in the normal state. The data indicate the growth of the highTc (2223) phase with corresponding reduction of the lowTc (2122) phase with increasingx, up to 0·25. Beyond this value ofx there is a slight deterioration of the superconducting behaviour.
Volume 43, 2020
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