Publication Date:
2014-08-23
Description:
We report on compositional tuning to create excellent field-performance of J c in “self-doped,” GdBa 2 Cu 3 O 7−y (GdBCO) coated conductors grown by ultrafast reactive co-evaporation. In order to give excess liquid and Gd 2 O 3 , the overall compositions were all Ba-poor and Cu-rich compared to GdBCO. The precise composition was found to be critical to the current carrying performance. The most copper-rich composition had an optimum self-field J c of 3.2 MA cm −2 . A more Gd-rich composition had the best in-field performance because of the formation of low coherence, splayed Gd 2 O 3 nanoparticles, giving J c (77 K, 1 T) of over 1 MA cm −2 and J c (77 K, 5 T) of over 0.1 MA cm −2 .
Electronic ISSN:
2166-532X
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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