journal article·2021-01-20Open access

Superconducting Joining Concept for Internal Magnesium Diffusion-Processed Magnesium Diboride Wires

Dipak Patel, Akiyoshi Matsumoto, Hiroaki Kumakura, Taku Moronaga, Yuka Hara, Toru Hara, Minoru Maeda, Md. Shahriar A. Hossain, Yusuke Yamauchi, Seyong Choi, Jung Ho Kim

Abstract

A superconducting joint of unreacted monofilament internal magnesium diffusion-processed magnesium diboride (MgB2) wires was fabricated by exploiting the phenomenon of magnesium diffusion into the boron layer inside the superconducting joint. Unprecedentedly, the joint was able to carry an almost identical transport current compared to the bare wire in a 2–7 T magnetic field at 20 K. The joint also exhibited very low joint resistance of 2.01 × 10–13 Ω in self-field at 20 K. Among commercially available superconductors, this work is the first to successfully realize a superconducting joint that is capable of transferring current from one conductor to another without any notable degradation under strong magnetic fields. This work demonstrates great potential to apply MgB2 in a range of practical applications, where superconducting joints are essential.
Source: openalex_inverted_index · Quality: baseline

Research context

OpenAlex topics: Superconductivity in MgB2 and Alloys · Iron-based superconductors research · Boron and Carbon Nanomaterials Research

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

High-Temperature Superconducting Wire Group, Research Center for Functional Materials, National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan

Electron Microscopy Analysis Station, Research Network and Facility Services Division, National Institute for Materials Science (NIMS), 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan

Department of Electrical Engineering, Kangwon National University, Kangwon 25913, Republic of Korea

School of Mechanical and Mining Engineering, Faculty of Engineering, Architecture and Information Technology (EAIT), The University of Queensland, Brisbane, Queensland 4072, Australia

Australian Institute for Bioengineering and Nanotechnology (AIBN), The University of Queensland, Brisbane, Queensland 4072, Australia

School of Chemical Engineering, Faculty of Engineering, Architecture and Information Technology (EAIT), The University of Queensland, Brisbane, Queensland 4072, Australia

JST-ERATO Yamauchi Materials Space-Tectonics Project and International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki 305-0044, Japan

Institute for Superconducting and Electronic Materials, Australian Institute for Innovative Materials, University of Wollongong, North Wollongong, New South Wales 2500, Australia

Funding

Japan Society for the Promotion of Science · National Institute for Materials Science

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