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Enhanced superconducting properties in bulk MgB2 through spark plasma sintering of ball-milled and sieved crystalline boron.

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Title: Enhanced superconducting properties in bulk MgB2 through spark plasma sintering of ball-milled and sieved crystalline boron.
Authors: Shadab, Malik, Xing, Yiteng, Noudem, Jacques, Miryala, Muralidhar
Source: Journal of Materials Science: Materials in Electronics; Sep2024, Vol. 35 Issue 26, p1-11, 11p
Subject Terms: MAGNETIZATION measurement, X-ray diffraction, SCANNING electron microscopy, CRITICAL currents, BALL mills
Abstract: In this study, in situ bulk MgB2 superconducting samples were sintered using spark plasma sintering (SPS) and characterized through various techniques, including X-ray diffraction (XRD), microstructure evaluation, and magnetization measurements. XRD analysis confirmed that MgB2 was the primary phase, with a secondary phase of MgO present in the sintered samples. Scanning electron microscopy (SEM) analysis revealed minimal porosity, and the bulk densities reached 95% of the theoretical value for MgB2, as calculated by mass volume. The samples exhibited remarkably high critical current densities (Jc), up to 405 kA/cm2 in self-field at 10 K, representing a 67% improvement over solid-state sintering. These high Jc values are attributed to the enhanced density of the bulk, which increases the superconducting area, which underscores the importance of density enhancement achieved through SPS and the MgB2 nanograins obtained via ball milling, and sieving of crystalline boron played a crucial role in this improvement. [ABSTRACT FROM AUTHOR]
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Description
Abstract:In this study, in situ bulk MgB<subscript>2</subscript> superconducting samples were sintered using spark plasma sintering (SPS) and characterized through various techniques, including X-ray diffraction (XRD), microstructure evaluation, and magnetization measurements. XRD analysis confirmed that MgB<subscript>2</subscript> was the primary phase, with a secondary phase of MgO present in the sintered samples. Scanning electron microscopy (SEM) analysis revealed minimal porosity, and the bulk densities reached 95% of the theoretical value for MgB<subscript>2</subscript>, as calculated by mass volume. The samples exhibited remarkably high critical current densities (J<subscript>c</subscript>), up to 405 kA/cm<sup>2</sup> in self-field at 10 K, representing a 67% improvement over solid-state sintering. These high J<subscript>c</subscript> values are attributed to the enhanced density of the bulk, which increases the superconducting area, which underscores the importance of density enhancement achieved through SPS and the MgB<subscript>2</subscript> nanograins obtained via ball milling, and sieving of crystalline boron played a crucial role in this improvement. [ABSTRACT FROM AUTHOR]
ISSN:09574522
DOI:10.1007/s10854-024-13475-7