High Critical Currents in Single Grain YBa2Cu3Oy Bulk Superconductors Produced by Infiltration-Growth

Kenta Nakazato; Miryala Muralidhar; Kazuo Inoue; Michael R. Koblischka; Masato Murakami

doi:10.4028/www.scientific.net/AST.95.181

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HomeAdvances in Science and TechnologyAdvances in Science and Technology Vol. 95High Critical Currents in Single Grain YBa2Cu3Oy...

High Critical Currents in Single Grain YBa₂Cu₃O_yBulk Superconductors Produced by Infiltration-Growth

Abstract:

Bulk YBa₂Cu₃O_y “Y-123” superconductors with high critical current density (J_c) have been grown by infiltrating a Ba₃Cu₅O_y “Y-035” liquid source into a Y₂BaCuO₅ “Y-211” precursor block. Magnetization measurements showed that similar T_c (onset) values and large variation in self-field critical currents were observed when the samples were isothermally grown at different temperatures. We then adapted slow cooling process for the samples 27 mm in diameter and 5 mm in thickness using the growth profile which was optimized on the basis of isothermal growth conditions. The specimens cut from various locations of a large bulk material showed the uniform and sharp superconducting transition with T_c (onset) around 93.2 K. J_cvalues at 77 K and 0T was in the range of 150 - 175 kA/cm². Such high J_c values could be obtained without refining the particle size of Y-211 secondary phase. Atomic force microscopy measurements revealed that uniform nanosized secondary Y-211 particles are embedded in the Y-123 matrix, which led to a dramatic improvement of the critical current performance at 77 K.

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Advances in Science and Technology (Volume 95)

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181-185

DOI:

https://doi.org/10.4028/www.scientific.net/AST.95.181

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October 2014

Authors:

Kenta Nakazato, Miryala Muralidhar*, Kazuo Inoue, Michael R. Koblischka, Masato Murakami

Keywords:

Critical Current Density (J_c), Infiltration Growth, Microstructure Analysis, Superconducting Transition Temperature (T_c), Y-123

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