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The influence of porosity on the superconducting properties of Y-Ba-Cu-O single grains

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jats:titleAbstract</jats:title> jats:pThe trapped field in Y–Ba–Cu–O (YBCO) bulk single grain superconductors correlates directly with the critical current density jats:italicJ</jats:italic> jats:subc</jats:sub>, which, in turn, is dependent on the microstructure of the bulk material. It has been shown recently and indirectly that porosity influences jats:italicJ</jats:italic> jats:subc</jats:sub> of these technologically important materials, in addition to the presence of well-researched Yjats:sub2</jats:sub>BaCuOjats:sub5</jats:sub> (Y-211) particles in the bulk sample. In this work, we report the direct impact of porosity on the critical current density of a single grain YBCO bulk superconductor using 3D x-ray computer tomography scans and superconducting quantum interference device measurements. It is concluded that porosity has a considerably more substantial impact on the measured critical current density than Y-211 on the micrometre scale with, predictably, a decrease in porosity leading to an increase in jats:italicJ</jats:italic> jats:subc</jats:sub>. jats:italicJ</jats:italic> jats:subc</jats:sub> is directly proportional to the trapped field, so any method that can reduce porosity, therefore, improves jats:italicJ</jats:italic> jats:subc</jats:sub>, and, subsequently, the trapped field of these technologically important bulk superconductors.</jats:p>



YBCO, microstructure, porosity, trapped field, critical current density, bulk single grain superconductors

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Superconductor Science and Technology

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IOP Publishing
EPSRC (2436322)
Engineering and Physical Sciences Research Council (EP/P024947/1)
EPSRC (EP/T014679/1)
Engineering and Physical Sciences Research Council (EP/R00661X/1)
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