Progress in the mass production of newly developed bulk (GdYEr)BaCuO "(Gd,Y,Er)123" and MgB systems is presented. Two batches of (Gd,Y,Er)123 pellets of 20 mm diameter and 7 mm thick were prepared in air by an infiltration growth "IG" process. Trapped field distribution profiles of fully grown bulk samples clearly showed that all samples were single-grain and the trapped field values were more than 0.5 T at 77 K, 1.3 mm above top surface. The best bulk exhibited the trapped field value of 0.63 T at 77 K. Ultra-sonication technique was employed for refining precursors of both (Gd,Y,Er)211 and boron. TEM studies revealed that boron powder subjected to ultrasonication was refined up to nanoscale. The micron-sized particles were reduced to nanoscale, which led to improvement of critical current by up to 36% in bulk MgB at 20 K and self-field. This progress in fabrication of high-performance LREBaCuO and MgB superconducting bulks further promotes commercialization of superconductors' production as a mode of sustainable technology.
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| http://dx.doi.org/10.1007/s10948-023-06515-6 | DOI Listing |
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