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SUMMARY:Processing of Gd-Ba-Cu-O single grain superconductors for high fie
 ld applications - Professor David Cardwell\, CUED
DTSTART:20100219T140000Z
DTEND:20100219T150000Z
UID:TALK22440@talks.cam.ac.uk
CONTACT:Ms Helen Gardner
DESCRIPTION:Top Seeded Melt Growth (TSMG) has been used extensively to fab
 ricate large\, single grain Y-Ba-Cu-O (YBCO) superconductors that can trap
  large magnetic fields. The TSMG method is economical and has enabled the 
 development of batch processes for the fabrication of a large number of bu
 lk single grain superconductors in a single furnace. In addition\, the tec
 hnique allows the fabrication of complex-shaped bulk samples with controll
 ed and strongly connected grains by using a multi-seeding process. A pract
 ical processing route for processing of LRE-Ba-Cu-O single grain supercond
 uctors (which have superior properties to YBCO) has been developed at Camb
 ridge over the past three years based on the development of a generic seed
  of melt-textured Mg-doped Nd-123 and suppression of solid solution phase 
 formation in air by enriching the precursor composition with excess Ba. We
  report the successful application of a practical TSMG process to the fabr
 ication of high performance Gd-Ba-Cu-O (GdNBCO) single grain superconducto
 r. This method has enabled the development of a batch process for GdBCO an
 d we demonstrate for the first time the fabrication of a large number of h
 igh performance Gd-Ba-Cu-O single grains in a single process. Finally\, we
  report the processing of bulk GdBCO in the form of complex geometries wit
 h controlled grain orientation.
LOCATION:Oatley Seminar Room\, Department of Engineering
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