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dc.contributor.authorBhagurkar, AG-
dc.contributor.authorYamamoto, A-
dc.contributor.authorAnguilano, L-
dc.contributor.authorDennis, AR-
dc.contributor.authorDurrell, JH-
dc.contributor.authorBabu, NH-
dc.contributor.authorCardwell, DA-
dc.identifier.citationSuperconductor Science and Technology, 29(3): pp. 1-9, (2016)en_US
dc.description.abstractThe wetting of boron with liquid magnesium is a critical factor in the synthesis of MgB2 bulk superconductors by the infiltration and growth (IG) process. Poor wetting characteristics can therefore result potentially in non-uniform infiltration, formation of defects in the final sample structure and poor structural homogeneity throughout the bulk material. Here we report the fabrication of near-net-shaped MgB2 bulk superconductors by a modified precursor infiltration and growth (MPIG) technique. A homogeneous bulk microstructure has subsequently been achieved via the uniform infiltration of Mg liquid by enriching pre-reacted MgB2 powder within the green precursor pellet as a wetting enhancer, leading to relatively little variation in superconducting properties across the entire bulk sample. Almost identical values of trapped magnetic field of 2.12 T have been measured at 5 K at both the top and bottom surfaces of a sample fabricated by the MPIG process, confirming the uniformity of the bulk microstructure. A maximum trapped field of 3 T has been measured at 5 K at the centre of a stack of two bulk MgB2 samples fabricated using this technique. A steady rise in trapped field was observed for this material with decreasing temperature down to 5 K without the occurrence of flux avalanches and with a relatively low field decay rate (1.5%/d). These properties are attributed to the presence of a fine distribution of residual Mg within the bulk microstructure generated by the MPIG processing technique.en_US
dc.description.sponsorshipKACSTCambridge Research Centre, Cambridge, UK and Engineering and Physical Science Research Council, UK. JST-PRESTO and JSPS.en_US
dc.format.extent? - ? (8)-
dc.publisherIOP Publishingen_US
dc.subjectInfiltration and growthen_US
dc.subjectTrapped fielden_US
dc.titleA trapped magnetic field of 3T in homogeneous, bulk MgB2 superconductors fabricated by a Modified Precursor Infiltration and Growth (MPIG) processen_US
dc.relation.isPartOfSuperconductor Science and Technology-
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