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Partially oriented MgB2 bulk discs (13 and 9 %) with starting compositions (MgB2)0.99(B4C)0.01 and (MgB2)0.99(c-BN)0.01 were fabricated by slip casting under a magnetic field H0=12T (perpendicular on the surface of the disc) and subsequent spark plasma sintering. The maximum critical current density and irreversibility field are for H//H0 (H = applied field). These values are higher or similar than for the randomly oriented samples with the same composition. The maximum volume pinning force (Fp) is lower in the partially than in randomly oriented samples. The pinning-force-related parameters depend on the additive and orientation and establishing the major pinning mechanism based on them within scaling and percolation models is not reliable. A method to scale Fp is proposed: for the randomly and partially oriented samples (that show an extra peak in Fp) single and double Gauss functions fit well. Results suggest an anisotropic influence of carbon substituting for boron in MgB2.

権利情報:

• Creative Commons BY-NC-ND Attribution-NonCommercial-NoDerivs 4.0 International
  

  This version of the article has been accepted for publication, after peer review (when applicable) and is subject to Springer Nature’s AM terms of use, but is not the Version of Record and does not reflect post-acceptance improvements, or any corrections. The Version of Record is available online at: https://doi.org/10.1016/j.materresbull.2020.111103

キーワード: MgB2, B4C and c-BN additions, c-axis texture, Critical current density, Pinning force

刊行年月日: 2020-10-12

出版者: Elsevier BV

掲載誌:

• Materials Research Bulletin (ISSN: 08837694) vol. 134 111103

研究助成金:

• MCI-UEFISCDI Romania
• COFUND-M-ERA.NET II
• Operational Programme Human Capital of the Ministry of European Funds 51668/09.07.2019

原稿種別: 著者最終稿 (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4987

公開URL: https://doi.org/10.1016/j.materresbull.2020.111103

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更新時刻: 2024-11-19 16:30:31 +0900

MDRでの公開時刻: 2024-11-19 16:30:31 +0900