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Multifilamentary Bi2Sr2CaCu2Ox (Bi-2212) wire made by the powder-in-tube technique is the only high temperature superconductor made in the round shape preferred by magnet builders. The critical current density (J C ) of Bi-2212 round wire was improved significantly by the development of overpressure heat treatment in the past few years. Bi-2212 wire is commercially available in multiple architectures and kilometer-long pieces and a very promising conductor for very high field NMR and accelerator magnets. We studied the effects of precursor powder and heat treatment conditions on the superconducting properties and microstructure of recent Bi-2212 wires. Short samples of recent wire with optimized overpressure processing showed J C (4.2 K, 15 T) = 6640 A/mm2 and J C (4.2 K, 30 T) = 4670 A/mm2, which correspond to engineering critical current densities J E (4.2 K, 15 T) = 1320 A/mm2 and J E (4.2 K, 30 T) = 930 A/mm2.
Pubmed ID: 33737796
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Facility offers array of solid state, solution state, MRI/S (animal and human), MR microscopy and diffusion capabilities and techniques. Among their machines is 900 MHz 105 mm bore magnet. Techniques and instruments are available at two different MagLab facilities in Florida, NMR-MRI/S Facility at MagLab headquarters near Florida State University in Tallahassee and Advanced Magnetic Resonance Imaging and Spectroscopy Facility (AMRIS) housed within McKnight Brain Institute at University of Florida in Gainesville.
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