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<p>This study investigates the alternating current (AC) losses in pristine and MgB<sub>2</sub>-added bulk Bi<sub>1.8</sub>Pb<sub>0.20</sub>Sr<sub>2</sub>Ca<sub>2</sub>Cu<sub>3</sub>O<sub>10+δ</sub> ((Bi, Pb)-2223) superconductors at 77 K. Polycrystalline pellets of (Bi, Pb)-2223 and 0.5, 1 and 2 wt.% MgB<sub>2</sub>-added bulk (Bi, Pb)-2223 were synthesized using a solid-state reaction process. X-Ray diffraction (XRD) analysis confirms the presence of (Bi, Pb)-2223 as the primary phase in the crystal structure. Electrical resistivity measurements between 77 and 300 K reveals a decrease in the transition temperature (<i>T</i><sub>c</sub>) and an increase in the transition width (∆<i>T</i><sub>c</sub>) of (Bi, Pb)-2223 with increasing MgB<sub>2</sub> concentration. Diamagnetic response of the samples indicates a decrease in the superconducting volume fraction of (Bi, Pb)-2223 upon MgB<sub>2</sub> addition. Magnetic AC losses were measured as a function of applied magnetic field and frequency. The eddy loss contribution, estimated using the expression reported by Chattopadhyay and Dey [<CitationRef AdditionalCitationIDS="CR15" CitationID="CR1">1</CitationRef>,<CitationRef CitationID="CR2">2</CitationRef>] has a measly contribution and hence confirms the dominant role of hysteresis loss in total magnetic AC losses.</p>

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Alternating current losses in MgB2 added bulk (Bi,Pb)-2223 superconductor

  • 期刊论文

  • 发表日期：

    2025年9月23日

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  • D Tripathi,
  • B C Joshi,
  • Mohd Saif,
  • Himanshu Pandey,
  • Shalini Raj,
  • T K Dey

摘要

This study investigates the alternating current (AC) losses in pristine and MgB2-added bulk Bi1.8Pb0.20Sr2Ca2Cu3O10+δ ((Bi, Pb)-2223) superconductors at 77 K. Polycrystalline pellets of (Bi, Pb)-2223 and 0.5, 1 and 2 wt.% MgB2-added bulk (Bi, Pb)-2223 were synthesized using a solid-state reaction process. X-Ray diffraction (XRD) analysis confirms the presence of (Bi, Pb)-2223 as the primary phase in the crystal structure. Electrical resistivity measurements between 77 and 300 K reveals a decrease in the transition temperature (Tc) and an increase in the transition width (∆Tc) of (Bi, Pb)-2223 with increasing MgB2 concentration. Diamagnetic response of the samples indicates a decrease in the superconducting volume fraction of (Bi, Pb)-2223 upon MgB2 addition. Magnetic AC losses were measured as a function of applied magnetic field and frequency. The eddy loss contribution, estimated using the expression reported by Chattopadhyay and Dey [1,2] has a measly contribution and hence confirms the dominant role of hysteresis loss in total magnetic AC losses.