Abstract
Abstract Two series of the superconducting materials with nominal composition Bi 1.6− y V y Pb 0.4 Sr 2 Ca 2 Cu 3 O δ and Bi 1.6− y V y Pb 0.4 Sr 1.6 Ba 0.4 Ca 2 Cu 3 O δ (where y = 0.0, 0.1, 0.2, 0.3) were prepared by the conventional solid-state reaction method. The effect of vanadium and barium substitution at Bi and Sr sites respectively, have been investigated by the X-ray diffraction, scanning electron microscopy, dc electrical resistivity, ac susceptibility and critical current density. Room temperature X-ray diffraction studies show that there exists two phases i.e. Bi-(2223) and Bi-(2212) in the analyzed samples. The evaluated crystalline lattice structure of the prepared sample mainly belongs to the superconductive orthorhombic Bi-(2223) and Bi-(2212) phases. The dc electrical resistivity data agree with the ac susceptibility measurements. The onset temperature T c (onset) and zero resistivity critical temperature T c ( R = 0) of all the samples remains within the temperature range ≈112–116 ± 1 K and 104–108 ± 1 K respectively. The measurements showed that the highest T c ( R = 0) value of the superconducting sample is 108 ± 1 K, with composition Bi 1.6 Pb 0.4 Sr 1.6 Ba 0.4 Ca 2 Cu 3 O δ . By increasing the vanadium concentration, an increase in the critical current density in both the series has been observed.
Published Version
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