|Cite this article as:|
|Miryala Sushma 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. https://doi.org/10.1007/s12613-020-2213-y|
The utilization of novel materials, high Tc superconductors in particular, is essential in order to pursue the United Nations Sustainable Goals as well as the increasing worldwide demand for clean and carbon-free electric power technologies. Superconducting magnets have proven to be beneficial in several real-life applications such as transportation, energy production, MRI, drug delivery system etc. To achieve high performance, it is crucial to develop uniform large-grain infiltration-growth processed bulk YBa2Cu3Oy (Y-123) super-magnets. In this paper, we are reporting the magnetic and microstructural properties of large-grain top-seeded infiltration growth processed Y-123 pellet of 20 mm in diameter and 6 mm in height, produced utilizing the liquid Yb-123+Ba3Cu5O8 as liquid source. All samples cut at the top of the bulk have a sharp superconducting transition (~ 1 K wide) with the onset Tc around 90 K. On the other hand, in the samples cut from the bottom surface, the onset Tc values slightly decreased to values between 88 K and 90 K, still with a sharp superconducting transition. The top and bottom samples exhibited the highest remnant value of Jc at 77KH//c-axis of 50 kA/cm2 and 55 kA/cm2, respectively. The remnant Jc and irreversibility field values significantly fluctuated, being quite low in some bottom samples. Scanning electron microscopy (SEM) identified nanometer-size Y-211 secondary phase particles dispersed in the Y-123 matrix. The energy dispersive spectroscopy (EDS) clarified that the decreased critical temperature (Tc) and critical current density (Jc) for the bottom samples were due to liquid phase dispersion within Y-123 phase.