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High-Performance Bulk MgB2 Superconductor Using Amorphous Nano-boron

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Abstract

MgB2 bulks were produced by in situ solid-state reaction in Ar gas using high-purity commercial powders of Mg metal and amorphous nano-B mixed in a fixed ratio of Mg:B = 1:2. Single-phase materials have been obtained and grain structure and its implications are reported. All samples were sintered at 775 °C for 3 h in Ar atmosphere. X-ray diffraction results show that high-purity MgB2 phase has been fabricated, which as well is reflected in critical temperature (Tc = 37.8 K). Magnetic measurements reveal a high critical current density (Jc) value such as 408 kA/cm2 when nano-amorphous boron is used. SEM studies show that nano-ordered MgB2 grains are formed, thereby creating large number of grain boundaries responsible for high critical current densities. Analysis of normalized pinning force curve as a function of reduced magnetic field indicates that dominant pinning is caused by grain boundaries.

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Acknowledgements

One of the authors (Sai Srikanth Arvapalli) acknowledges support from SIT for providing the financial support for the doctoral program.

Funding

This work was partly supported by the Shibaura Institute of Technology (SIT) Research Center for Green Innovation and Grant-in-Aid FD research budget code: 112282.

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Authors and Affiliations

  1. Graduate School of Science and Engineering, Regional Environment Systems, Superconducting Research Laboratory (SRL), Shibaura Institute of Technology, 3-7-5 Toyosu, Koto-ku, Tokyo, 135-8548, Japan

    Sai Srikanth Arvapalli, Miryala Muralidhar & Masato Murakami

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  1. Sai Srikanth Arvapalli
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  2. Miryala Muralidhar
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  3. Masato Murakami
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Correspondence to Miryala Muralidhar.

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Arvapalli, S.S., Muralidhar, M. & Murakami, M. High-Performance Bulk MgB2 Superconductor Using Amorphous Nano-boron. J Supercond Nov Magn 32, 1891–1895 (2019). https://doi.org/10.1007/s10948-018-4919-x

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  • DOI: https://doi.org/10.1007/s10948-018-4919-x

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