(Bi1-xPbx:)2Sr2Ca2Cu3Oy (x = 0.3) high critical transition temperature (T c) superconductors are synthesized by the solid-state reaction method in polycrystalline form. X-ray diffraction (XRD) studies, direct current (dc) electrical resistivity measurements, scanning electron microscopic (SEM) studies, critical current density measurements, and zero-field alternating current (ac) susceptibility measurements are performed to investigate the physical changes, structural changes, and magnetic behavior of the superconducting samples. X-ray diffraction studies show that a highT c phase exists with orthorhombic symmetry in the specimen. According to the XRD data, the lattice parameters of the highT c phase were determined asa = 0.537(1) nm,b = 0.539(1) nm, andc = 3.70(1) nm. The compound exhibits a superconducting transition at 106 ±1 K for zero resistance. The ac susceptibility measurements in zero field confirm the dc electrical resistivity results; hence both support the XRD results. The particle size and structural changes as a function of the cold-pressing and aging effect are also reported.
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Awan, M.S., Maqsood, M., Mirza, S.A. et al. Preparation and physical properties of polycrystalline (Bi1-xPbx)2Sr2Ca2Cu3Oy highT c superconductors. JMEP 4, 54–58 (1995) doi:10.1007/BF02682705
- dc electrical resistivity
- ac magnetic susceptibility