Preparation and physical properties of polycrystalline (Bi1-xPbx)2Sr2Ca2Cu3Oy highTc superconductors
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(Bi1-xPbx:)2Sr2Ca2Cu3Oy (x = 0.3) high critical transition temperature (Tc) 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 highTc phase exists with orthorhombic symmetry in the specimen. According to the XRD data, the lattice parameters of the highTc 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.
Keywordssuperconductivity dc electrical resistivity ac magnetic susceptibility
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- 4.T. Hatano, K. Aota, S. Idea, K. Nakamura, and K. Ogawa,Jpn. J. Appl. Phys., Vol 27, p L2055Google Scholar