Enhanced critical current density in Gd-added (Bi, Pb)-2212 bulk superconductor

Abstract

The effects of Gd addition on the phase evolution and superconducting properties of (Bi, Pb)-2212 prepared in the bulk polycrystalline form were studied. The Gd content in the samples was varied from 0.0 to 0.5 on a general stoichiometry of Bi1.7Pb0.4Sr2.0Ca1.1Cu2.1GdxOy. Phase analysis by means of x-ray diffraction, microstructural examination by scanning electron microscopy and superconducting property studies were carried out to evaluate the relative performances of the samples. It is observed that Gd addition enhances the transition temperature (TC) and critical current density (JC) of the system. Moreover no secondary phase containing Gd ions or any other cations was observed after the final stage of heat treatment. Microstructural examination shows clear and distinct morphologies for the Gd-added samples, wherein the grain growth is suppressed by the addition of Gd and the edges of the grains become more and more rounded. As a result, there is an increase in the porosity of the Gd-added samples, leading to a reduction in the sintered density for these samples.

Investigation of Structural and Superconducting Properties of Cr Added Bi-2212 Superconducting Ceramics

“…Bi-based cuprate superconductors represented by the series Bi 2 Sr 2 Ca n−1 Cu n O 2n+4 with n = 1, 2, and 3 have some important properties for the fundamental researches and applications in technology and industry owing to the their remarkable smaller power losses, high current, and magnetic field carrying capacity, optical, and electronic properties [1][2][3][4][5]. Several techniques [6][7][8][9][10][11][12][13][14] have widely been used to improve their superconducting properties for years.…”

Effect of Annealing Time and Temperature on Microstructural and Superconducting Properties of (Bi,Pb)-2212 Thin Films Produced by Magnetron Reactive Sputtering

“…It is well known there are a plenty of methods [60][61][62] for explanation of the pinning mechanism in a thin film. Measurement of the critical current density (J c ) is one of the most preferred methods.…”

The Influence of Postannealing on Structural and Superconducting Properties of Bi-2212 Ceramics

“…Among the high-temperature superconducting materials, the Bi-2212 phase is considered as the most attractive because it has high chemical stability and is relatively easy to synthesize for many technological and industrial applications [1][2][3][4][5][6][7].…”