Study on the Sintering and Mg Composition Effect on MgB₂ Superconducting Bulks and Wires Synthesized by Powder-in-Sealed-Tube Method

Abstract:

Numerous research efforts aimed at the MgB₂ (Magnesium diboride) as a superconducting material due to its higher critical temperature than Nb-based superconductors such as NbTi, Nb₃Sn. Nowadays MgB₂ is becoming more popular as the candidate to be applied on medical devices and large-scale applications because of its full coherence lengths, improved critical current density and fields, and simple crystal structure. In this study, we fabricated the 4 mm MgB₂ superconducting wires by mixing stoichiometric mole ratio of Mg: B with 1.0:2.0 and 1.1:2.0 through the Powder-In-Sealed-Tube (PIST) method to optimize high critical temperature (T_C) than the conventional MgB₂ bulk and wire. Furthermore, we decreased the diameter of 4 mm to 1.8 mm wire and analyze the effect of critical temperature. The specimens were sintered at a different temperature to investigate the sintering effect of MgB₂ superconducting wire. The resistivity versus temperature relationship, surface morphology, and crystal phase was characterized using Cryogenic system, SEM (Scanning Electron Microscopy), and XRD (X-ray Diffractometer), respectively. We optimized the high Tc,onset for the bulk and 4 mm wire compared to other studies that are 42.1K and 40.3K respectively at 800°C sintered temperature. Finally, the results suggest that the stoichiometric ratio of MgB₂ exhibited excellent feasibility to prepare conventional MgB₂ superconducting wire.

• Periodical: Advanced Materials Research (Volume 1166)
• Pages: 1-12
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1166.1
• Online since: September 2021
• Authors: Md Rauf Ul Karim Khan, Agung Imaduddin*, Heri Nugraha, Reiji Hattori, Andika Widya Pramono
• Keywords: Critical Temperature, MgB₂ Superconducting Wires, Powder-in-Sealed-Tube Method, SEM, XRD

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