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معهد البحوث والاستشارات الطبية | Institute for Research and Medical Consultations

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Browsing معهد البحوث والاستشارات الطبية | Institute for Research and Medical Consultations by Author "Alotaibi, Sarah Awaadh Fares"

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    Enhancement of superconducting performances of YBa2Cu3O7-δ compound with co-addition of nanoparticles of ternary and binary perovskite oxides
    (2022) Alotaibi, Sarah Awaadh Fares; Yassine Slimani; Munirah Abdullah Almessiere
    The discovery of high-temperature superconducting materials (HTS) is a new leap in materials science for their unique properties that differentiate them from other conductive materials, which give them preference in the field of practical and technical applications. Interesting generation of high-temperature superconducting was discovered for the called Yttrium Barium Copper Oxide (YBa2Cu3Oy, noted as YBCO for abbreviation) material with high critical current density (Jc), elevated critical temperature (Tc) above the liquid nitrogen boiling point (77 K), and high critical magnetic fields (Hc). These unique features open the way for YBCO superconductors for various applications. The main issue in YBCO performance was the rapid decrease in Jc value at high applied fields. This is due to the existence of weak links within the polycrystalline YBCO materials and the motion of vortices under an applied magnetic field. Improving the intergranular properties of polycrystalline YBCO materials and generating artificial pinning centers (APCs) within YBCO matrix were the most efficient solutions. These can be achieved by using chemical doping/substitution or additives. In this work, we aimed to enhance the performance of YBCO superconductor by introducing appropriate and efficient pinning centers. Accordingly, we have studied the influence of co-adding a ternary dielectric perovskite oxide and a binary perovskite oxide like transition metal oxide on the superconducting properties of YBCO material. For doing so, high purity of BaTiO3 and WO3 nanoparticles were firstly prepared via sol-gel auto-combustion route and hydrothermal method, respectively. Then, pure YBCO (x = 0.00 wt.%) and YBCO co-added with different amounts of nanoparticles of BaTiO3 and WO3 (x = 0.05, 0.10, and 0.20 wt.%) were synthesized by using the solid-state reaction approach. The structure, morphology, electrical, and magnetic properties of different compositions were deeply investigated using X-ray powder diffraction (XRD), field-emission scanning electron microscope (FESEM), standard four-probe method, and physical property measurement system (PPMS), respectively. XRD analyses revealed that the orthorhombic structure is preserved for lower concentrations of co-added BTO/WO3 nanoparticles. FESEM observations showed the implantation of W-rich nanosized entities within the grains and dispersion of both BTO and WO3 nanoparticles at the grain boundaries to play the role of bridges connecting the superconducting grains. The electrical resistivity measurements revealed the manifestation of transition to the superconducting state for all prepared samples. Further analyses of the critical current density (Jc), flux pinning, as well as intergranular and intragranular properties, were explored by using the DC magnetization and AC magnetic susceptibility measurements. The magnetization critical current density (Jc) and intergranular critical current density J_cinter are significantly enhanced for the 0.05 wt.% BTO/WO3 nanoparticles co-added YBCO sample. The boosting factor for Jc in this composition reached up to 45 in the entire applied magnetic field compared to the pristine YBCO sample. All these results proved the important role of BaTiO3/WO3 nanoparticles co-addition on the flux pinning strengthening in the YBCO superconductor, indicating that these nanoparticles are promising artificial pinning centers to enhance the performance of YBCO material. Our obtained results can provide a reference for the demonstration of large-scale HTSc systems in different technologies and are very encouraging in view of the wide implementation of these YBCO/(BTO/WO3)x samples in several applications including power energy transmission, energy storage, superconducting MRI magnets, etc.