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Abstract <p>The structure of the core of superconducting single-filamentary MgB<sub>2</sub>/Nb,Cu composite doped with 1 wt % of Dy<sub>2</sub>O<sub>3</sub> dysprosium oxide is studied using transmission and scanning electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray diffraction analysis. It is found that Dy atoms do not substitute for Mg or B atoms in the MgB<sub>2</sub> lattice and form dysprosium-based inclusions which serve as pinning centers for magnetic flux vortices. Sizes of the inclusions and their locations in the MgB<sub>2</sub> matrix are determined. The doping of the MgB<sub>2</sub> core with dysprosium oxide is shown to lead to the significant increase in the critical current density <i>J</i><sub>c</sub> at 4.2 K; in fields of 0, 1, and 2 T the increase is 1.7 ×10<sup>2</sup>, 2.6 ×10<sup>3</sup>, and 4 ×10<sup>3</sup> times as compared to <i>J</i><sub>c</sub> of the undoped composite, respectively. The doping with Dy<sub>2</sub>O<sub>3</sub> results in the increase in the critical temperature <i>T</i><sub>c</sub> from 35 to 38 K.</p>

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Structure and Superconducting Properties of Single-Filamentary MgB2/Nb,Cu Composite Doped with Dy2O3

  • 期刊论文

  • 发表日期：

    2025年7月1日

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  • E. I. Kuznetsova,
  • T. P. Krinitsina,
  • Yu. V. Blinova,
  • M. V. Degtyarev,
  • P. V. Konovalov,
  • K. K. Dikhtievskaya,
  • I. M. Abdyukhanov,
  • A. S. Tsapleva

摘要

Abstract

The structure of the core of superconducting single-filamentary MgB2/Nb,Cu composite doped with 1 wt % of Dy2O3 dysprosium oxide is studied using transmission and scanning electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray diffraction analysis. It is found that Dy atoms do not substitute for Mg or B atoms in the MgB2 lattice and form dysprosium-based inclusions which serve as pinning centers for magnetic flux vortices. Sizes of the inclusions and their locations in the MgB2 matrix are determined. The doping of the MgB2 core with dysprosium oxide is shown to lead to the significant increase in the critical current density Jc at 4.2 K; in fields of 0, 1, and 2 T the increase is 1.7 ×102, 2.6 ×103, and 4 ×103 times as compared to Jc of the undoped composite, respectively. The doping with Dy2O3 results in the increase in the critical temperature Tc from 35 to 38 K.