Enhanced flux pinning in Zr-doped MgB2 bulk superconductors prepared at ambient pressure

DOI PDF 被引用文献1件
  • Y. Feng
    Northwest Institute for Nonferrous Metal Research, P.O. Box 51, Xi’an, 710016 China
  • Y. Zhao
    Superconductivity Research Laboratory, ISTEC, 1-10-13 Shinonome, Koto-ku, Tokyo 135, Japan and School of Materials Science and Engineering, University of New South Wales, Sydney, 2052, NSW, Australia
  • A. K. Pradhan
    Superconductivity Research Laboratory, ISTEC, 1-10-13 Shinonome, Koto-ku, Tokyo 135, Japan and School of Materials Science and Engineering, University of New South Wales, Sydney, 2052, NSW, Australia
  • C. H. Cheng
    Superconductivity Research Laboratory, ISTEC, 1-10-13 Shinonome, Koto-ku, Tokyo 135, Japan and School of Materials Science and Engineering, University of New South Wales, Sydney, 2052, NSW, Australia
  • J. K. F. Yau
    Department of Manufacturing Engineering and Engineering Management, City University of Hong Kong, Hong Kong, China
  • L. Zhou
    Northwest Institute for Nonferrous Metal Research, P.O. Box 51, Xi’an, 710016 China
  • N. Koshizuka
    Superconductivity Research Laboratory, ISTEC, 1-10-13 Shinonome, Koto-Ku, Tokyo 135, Japan
  • M. Murakami
    Superconductivity Research Laboratory, ISTEC, 1-10-13 Shinonome, Koto-Ku, Tokyo 135, Japan

説明

<jats:p>We prepared a series of Mg1−xZrxB2 bulk samples with different x values by the solid-state reaction at ambient pressure and investigated the effects of the Zr doping on phase compositions, microstructure, and flux pinning behavior. The results indicate that the a axis increases with the increase of the Zr doping and the c axis remains unchanged. ZrB2 phases form and a small amount of Zr atoms may substitute Mg in Zr-doped samples. Critical temperature drops with increasing the Zr doping. It is found that critical current density Jc can be significantly enhanced by the Zr doping and the best data are achieved in Mg0.9Zr0.1B2. For this sample, Jc values are remarkably improved to 1.83×106 A/cm2 in the self field and 5.51×105 A/cm2 in 1 T at 20 K. Also, the irreversibility field is increased by the Zr doping. The high density, fine grain size of MgB2, and small ZrB2 particles in Zr-doped samples may be responsible for the enhancement of Jc. Also, the field dependence of Jc at different temperatures was briefly discussed.</jats:p>

収録刊行物

被引用文献 (1)*注記

もっと見る

詳細情報 詳細情報について

問題の指摘

ページトップへ