Investigation of Layered Structure Formation in MgB2 Wires Produced by the Internal Mg Coating Process under Low and High Isostatic Pressures

Author:

Gajda Daniel1,Babij Michał1ORCID,Zaleski Andrzej1ORCID,Avci Doğan2ORCID,Karaboga Fırat3,Yetis Hakan4ORCID,Belenli Ibrahim4,Czujko Tomasz5ORCID

Affiliation:

1. Institute of Low Temperature and Structure Research, Polish Academy of Sciences (PAS), Okólna 2, 50-422 Wroclaw, Poland

2. Quatum Metrology Laboratory, National Metrology İnstitute TÜBİTAK, 41470 Kocaeli, Turkey

3. Mehmet Tanrikulu Vocational School of Health Services, Bolu Abant Izzet Baysal University, 14030 Bolu, Turkey

4. Department of Physics, Bolu Abant Izzet Baysal University, 14280 Bolu, Turkey

5. Institute of Materials Science and Engineering, Military University of Technology, Kaliskiego 2, 00-908 Warsaw, Poland

Abstract

Currently, MgB2 wires made by the powder-in-tube (PIT) method are most often used in the construction and design of superconducting devices. In this work, we investigated the impact of heat treatment under both low and high isostatic pressures on the formation of a layered structure in PIT MgB2 wires manufactured using the Mg coating method. The microstructure, chemical composition, and density of the obtained superconductive wires were investigated using scanning electron microscopy (SEM) with an energy-dispersive X-ray spectroscopy (EDS) analyzer and optical microscopy with Kameram CMOS software (version 2.11.5.6). Transport measurements of critical parameters were made by using the Physical Property Measurement System (PPMS) for 100 mA and 19 Hz in a perpendicular magnetic field. We observed that the Mg coating method can significantly reduce the reactions of B with the Fe sheath. Moreover, the shape, uniformity, and continuity of the layered structure (cracks, gaps) depend on the homogeneity of the B layer before the synthesis reaction. Additionally, the formation of a layered structure depends on the annealing temperature (for Mg in the liquid or solid-state), isostatic pressure, type of boron, and density of layer B before the synthesis reaction.

Funder

Institute of Low Temperature and Structure Research, PAS

Department of Materials Technology, Military University of Technology

Publisher

MDPI AG

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