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http://bura.brunel.ac.uk/handle/2438/1996
Title: | Strongly coupled artificial bulk HTS grain boundaries with high critical current densities |
Authors: | Hari Babu, N Withnell, TD Iida, K Cardwell, DA |
Keywords: | Artificial grain boundaries; high temperature superconductors; multi-seeding; Y-Ba-Cu-O |
Issue Date: | 2007 |
Publisher: | IEEE |
Citation: | IEEE Trans Applied Superconductivity, 17: 2949 |
Abstract: | A multi-seeding process has been developed to fabricate single Y-Ba-Cu-O (YBCO) grains containing strong artificial grain boundaries. Multi-seeding of heterogeneous YBCO grains with controlled orientation was achieved using large Sm-Ba-Cu-O (SmBCO) single crystal seeds of rod-like geometry with slots of various widths (up to 13 mm) cut into their bottom surface (i.e. parallel to the c-axis of the seed) to produce a bridge-like structure. Several YBCO grains with artificial grain boundaries were fabricated from these seed crystals and used to investigate the effect of varying the distance between the individual grain nucleation sites and the grain orientation (in-plane and out of plane) on the nature of grain boundaries. The measured local magnetic critical current density (Jc) and the magnitude of the trapped field across these artificial grain boundaries indicate that seed alignment is a key parameter in achieving strongly-coupled grain boundaries in multi-seeded grains. |
URI: | http://bura.brunel.ac.uk/handle/2438/1996 |
DOI: | http://dx.doi.org/10.1109/TASC.2007.899063 |
ISSN: | 1051-8223 |
Appears in Collections: | Materials Engineering Brunel Centre for Advanced Solidification Technology (BCAST) |
Files in This Item:
File | Description | Size | Format | |
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Strongly Coupled Artificial Bulk HTS Grain Boundaries With High Critical Current Densities.pdf | 420.01 kB | Adobe PDF | View/Open |
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