Structural and electrical investigations of novel CdFeO/(Bi,Pb)-2212 superconductor composite

• Published in: Phase transitions Vol. 95; no. 8-9; pp. 651 - 666
• Main Authors: Abbas, S., Basma, H., Awad, R., Hassan, M.S.
• Format: Journal Article
• Language: English
• Published: Abingdon Taylor & Francis 02.09.2022; Taylor & Francis Ltd
• Subjects: (Bi,Pb)-2212 superconductor; Absorption spectra; Bismuth strontium calcium copper oxide; CdFeO nanoparticles; Chemical composition; Critical current density; Current voltage characteristics; Electrical resistivity; Emission spectroscopy; Fourier transforms; FTIR; Functional groups; Nanoparticles; Orthorhombic phase; Oxidation; Photoelectrons; Superconductivity; Transition temperature; Transition temperatures; X ray powder diffraction; XPS
• ISSN: 0141-1594; 1029-0338
• DOI: 10.1080/01411594.2022.2095273

The current investigation reports the influence of the addition of CdFeO nanoparticles on the structural and superconducting properties of the (Bi,Pb)-2212 phase. The formation of an orthorhombic phase of Bi-2212 superconductor is confirmed by the X-ray powder diffraction measurements. The scanning electron microscope measurements show an improvement in the grain connectivity and a decline of voids due to the CdFeO nanoparticles addition. The Fourier transform infra-red spectroscopy is used to associate the absorption bands to equivalent functional groups. The DC-electrical resistivity and the I-V characteristic measurements show an enhancement of the superconducting transition temperature (T c ) and the critical current density (J c ) up to 0.02 wt% addition of CdFeO, respectively. The elemental composition and oxidation states are determined using X-ray photoelectron emission spectroscopy. The results suggest a correlation between the electric behavior and the cationic equilibrium reactions among Pb 2+ ions in Bi 3+ or Cu 2+ sites.