Enhancement of Critical Current Density of Nb 3 Al Superconductors by B Doping

Boron (B)‐doped Nb 3 Al superconductors are prepared by mechanical alloying and subsequent sintering process in this work. Then, the critical current density ( J c ) of Nb 3 Al with different amounts of B doping is studied. In the results, it is shown that J c performance of Nb 3 Al is improved obvi...

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Published in:Physica status solidi. A, Applications and materials science Applications and materials science, 2024-01, Vol.221 (2)
Main Authors: Li, Xinhua, He, Yaqi, Tan, Jing, Zhao, Li, Du, Zunfeng, Chen, Songhua, Ma, Zongqing
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container_title Physica status solidi. A, Applications and materials science
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He, Yaqi
Tan, Jing
Zhao, Li
Du, Zunfeng
Chen, Songhua
Ma, Zongqing
description Boron (B)‐doped Nb 3 Al superconductors are prepared by mechanical alloying and subsequent sintering process in this work. Then, the critical current density ( J c ) of Nb 3 Al with different amounts of B doping is studied. In the results, it is shown that J c performance of Nb 3 Al is improved obviously after B doping. The best J c value obtained in this work is 2.2 × 10 4  A cm −2 (4.2 K, 5 T) for Nb 3 (Al 0.9 B 0.1 ) sample. Furthermore, the mechanism of enhanced J c performance for Nb 3 (Al 0.9 B 0.1 ) sample is comprehensively explored. It is found that B doping can significantly enhance the grain connectivity of Nb 3 Al superconductor, and the active cross‐sectional area fraction values increase from 0.11 for the undoped sample to 0.34 for Nb 3 (Al 0.9 B 0.1 ) sample. In addition, the lattice distortion caused by the interstitially dissolved B may also serve as flux pinning centers, which strengthens the flux pinning force of Nb 3 (Al 0.9 B 0.1 ).
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