Improvement of critical current density of MgB2 bulk superconductor processed by Spark Plasma Sintering

Jacques G. Noudem; Yiteng Xing; Pierre Bernstein; Richard Retoux; Masaki Higuchi; Srikanth S. Arvapalli; Miryala Muralidhar; Masato Murakami

doi:10.1111/jace.17366

Improvement of critical current density of MgB₂ bulk superconductor processed by Spark Plasma Sintering

Jacques G. Noudem, Yiteng Xing, Pierre Bernstein, Richard Retoux, Masaki Higuchi, Srikanth S. Arvapalli, Miryala Muralidhar, Masato Murakami

Research output: Contribution to journal › Article › peer-review

7 Citations (Scopus)

Abstract

Spark Plasma Sintering (SPS) is a promising rapid consolidation technique that allows a better understanding and optimization of the sintering kinetics and therefore makes it possible to obtain MgB₂ bulk superconductor with tailored microstructures consisting of grains with either spherical or elongated morphology. In this contribution, the role of the precursor powders on the superconducting properties of MgB₂ is investigated. Three sets of bulk MgB₂ material were processed from: (i) a commercially available MgB₂ powder; (ii) a mixture of Mg metal and amorphous B using a single-step solid-state reaction process and (iii) a mixture of amorphous boron coated with carbon and Mg metal. The samples were prepared in the same SPS processing conditions. The microstructure of the samples was investigated by X-ray diffraction, SEM and TEM and correlated to their superconducting properties. The critical current density of the best sample at 20K was J_c = 500 kA/cm² in self-field, which is one of the highest critical current density reported for MgB₂ bulk superconductors.

Original language	English
Pages (from-to)	6169-6175
Number of pages	7
Journal	Journal of the American Ceramic Society
Volume	103
Issue number	11
DOIs	https://doi.org/10.1111/jace.17366
Publication status	Published - 2020 Nov 1

Keywords

MgB
critical current density (J)
flux pinning
microstructure
spark plasma sintering

ASJC Scopus subject areas

Ceramics and Composites
Materials Chemistry

Access to Document

10.1111/jace.17366

Cite this

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title = "Improvement of critical current density of MgB2 bulk superconductor processed by Spark Plasma Sintering",

abstract = "Spark Plasma Sintering (SPS) is a promising rapid consolidation technique that allows a better understanding and optimization of the sintering kinetics and therefore makes it possible to obtain MgB2 bulk superconductor with tailored microstructures consisting of grains with either spherical or elongated morphology. In this contribution, the role of the precursor powders on the superconducting properties of MgB2 is investigated. Three sets of bulk MgB2 material were processed from: (i) a commercially available MgB2 powder; (ii) a mixture of Mg metal and amorphous B using a single-step solid-state reaction process and (iii) a mixture of amorphous boron coated with carbon and Mg metal. The samples were prepared in the same SPS processing conditions. The microstructure of the samples was investigated by X-ray diffraction, SEM and TEM and correlated to their superconducting properties. The critical current density of the best sample at 20K was Jc = 500 kA/cm2 in self-field, which is one of the highest critical current density reported for MgB2 bulk superconductors.",

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author = "Noudem, {Jacques G.} and Yiteng Xing and Pierre Bernstein and Richard Retoux and Masaki Higuchi and Arvapalli, {Srikanth S.} and Miryala Muralidhar and Masato Murakami",

note = "Funding Information: Mrs Y. XING thanks the {"}Conseil R{\'e}gional‐Normandie, France{"} for her thesis grant. The authors thank Mr Jer{\^o}me Lecourt and Mrs Christelle Bilot for their technical support. Publisher Copyright: {\textcopyright} 2020 The Authors. Journal of the American Ceramic Society published by Wiley Periodicals LLC on behalf of American Ceramic Society (ACERS)",

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AU - Noudem, Jacques G.

AU - Xing, Yiteng

AU - Bernstein, Pierre

AU - Retoux, Richard

AU - Higuchi, Masaki

AU - Arvapalli, Srikanth S.

AU - Muralidhar, Miryala

AU - Murakami, Masato

N1 - Funding Information: Mrs Y. XING thanks the "Conseil Régional‐Normandie, France" for her thesis grant. The authors thank Mr Jerôme Lecourt and Mrs Christelle Bilot for their technical support. Publisher Copyright: © 2020 The Authors. Journal of the American Ceramic Society published by Wiley Periodicals LLC on behalf of American Ceramic Society (ACERS)

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