Special variation of infiltration-growth processed bulk YBCO fabricated using new liquid source: Ba3Cu5O8 (1:1.3) and YbBa2Cu3Oy

Sushma Miryala; Masato Murakami

doi:10.1007/s12613-020-2213-y

Volume 28 Issue 6

Jun. 2021

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2021 > 28(6): 1048-1056

Sushma Miryala and Masato Murakami, Special variation of infiltration-growth processed bulk YBCO fabricated using new liquid source: Ba₃Cu₅O₈ (1:1.3) and YbBa₂Cu₃O_y, Int. J. Miner. Metall. Mater., 28(2021), No. 6, pp. 1048-1056. https://doi.org/10.1007/s12613-020-2213-y

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Sushma Miryala and Masato Murakami, Special variation of infiltration-growth processed bulk YBCO fabricated using new liquid source: Ba3Cu5O8 (1:1.3) and YbBa2Cu3Oy, Int. J. Miner. Metall. Mater., 28(2021), No. 6, pp. 1048-1056. https://doi.org/10.1007/s12613-020-2213-y

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Research Article

Special variation of infiltration-growth processed bulk YBCO fabricated using new liquid source: Ba₃Cu₅O₈ (1:1.3) and YbBa₂Cu₃O_y

Sushma Miryala^{1, 2,} and
Masato Murakami¹

+ Author Affiliations

Corresponding author:
Sushma Miryala E-mail: sushmafeb15@gmail.com
Received: 13 August 2020; Revised: 15 October 2020; Accepted: 19 October 2020; Available online: 20 October 2020

Abstract

Abstract

Utilization of novel materials, particularly high-T_c (critical temperature) superconductors, is essential to pursue the United Nations’ Sustainable Goals, as well as to meet the increasing worldwide demand for clean and carbon-free electric power technologies. Superconducting magnets are beneficial in several real-life applications including transportation, energy production, magnetic resonance imaging (MRI), and drug delivery systems. To achieve high performance, one must develop uniform, large-grain, infiltration-growth (IG) processed bulk YBa₂Cu₃O_y (Y-123) super-magnets. In this study, we report the magnetic and microstructural properties of a large-grain, top-seeded, IG-processed Y-123 pellet, which is 20 mm in diameter and 6 mm in height; the pellet is produced utilizing liquid Yb-123+Ba₃Cu₅O₈ as the liquid source. All the samples cut from the top of the bulk exhibit a sharp superconducting transition (approximately 1 K wide) with the onset T_c of approximately 90 K. However, in the samples cut from the bottom surface, the onset T_c values slightly decreased to between 88 and 90 K, although still exhibiting a sharp superconducting transition. The top and bottom samples exhibited the highest remnant value of J_c (critical current density) at 77 K H//c-axis of 50 and 55 kA/cm², respectively. The remnant J_c and irreversibility field values significantly fluctuated, being fairly low in some bottom samples. Scanning electron microscopy identified nanometer size Y-211 (Y₂BaCuO₅) secondary-phase particles dispersed in the Y-123 matrix. Energy-dispersive spectroscopy clarified that the decreased both T_c and J_c for the bottom samples were attributed to liquid phase dispersion within the Y-123 phase.
- infiltration growth;
- special variation;
- critical current density;
- scanning electron microscopy

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