Akademik Veri Yönetim Sistemi
Journal of the Korean Physical Society, 2025 (SCI-Expanded)
In this study, Bi-2212 superconductor ceramics with Pr doping in the composition of Bi2Sr2PrxCaCu2O8+δ (x = 0.0; 0.1; 0.2; 0.3) were synthesized by the sol–gel method. An investigation was conducted to examine the effect of Pr doping on the structural, microstructural, and magnetic properties. X-ray diffraction (XRD) analysis demonstrated that the primary phase of Bi-2212 exhibited a decline in strength with increasing Pr doping, concomitant with the formation of secondary phases, including PrO2 and Bi-Sr-Ca oxides, within the structural arrangement. Scanning electron microscopy images revealed that the porous and heterogeneous microstructure observed in the undoped sample transformed into a more compact yet phase-separated texture with high Pr doping. Magnetic measurements reveal a distinct magnetic transition from a superconducting state to a paramagnetic state. The undoped sample exhibited a superconducting transition at approximately 85 K. It demonstrated a critical current density (Jc) of 8.7 × 104 A/cm2 at self-field at 10 K. Conversely, no superconducting transition was observed in the Pr-doped samples. The results obtained demonstrate that Pr doping disrupts the structural stability of the superconducting phase, promotes paramagnetic behavior through magnetic Pr3+ ions and secondary phase formation, and ultimately suppresses superconductivity.