CUED Publications database

Distribution of critical current density in large YBa<inf>2</inf>Cu<inf>3</inf>O<inf>7-δ</inf> grains fabricated using seeded peritectic solidification

Dewhurst, CD and Lo, W and Cardwell, DA (1997) Distribution of critical current density in large YBa<inf>2</inf>Cu<inf>3</inf>O<inf>7-δ</inf> grains fabricated using seeded peritectic solidification. IEEE Transactions on Applied Superconductivity, 7. pp. 1925-1928. ISSN 1051-8223

Full text not available from this repository.

Abstract

High quality large grain high T c superconducting ceramics offer enormous potential as 'permanent' magnets and in magnetic screening applications at 77K. This requires sample dimensions -cm with uniform high critical current densities of the order 10 5 A/cm 2 in applied magnetic fields of IT. We report a study of the magnetic characterisation of a typical large YBa 2 Cu 3 O7-δ grain, prepared by seeded peritectic solidification, and correlate the magnetically determined critical current density, J c , with microstuctural features from different regions of the bulk sample. From this data we extract the temperature, field and positional dependence of the critical current density of the samples and the irreversibility line. We find that whilst the bulk sample exhibits a good J c of order 10 4 A/cm 2 (77K, 1T), the local J c is strongly correlated with the sample microstructure towards the edge of the sample and more severely at the centre of the sample by the presence of SmBa 2 Cu 3 O 7-δ seed crystal. © 1997 IEEE.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div C > Materials Engineering
Depositing User: Cron Job
Date Deposited: 17 Jul 2017 19:36
Last Modified: 03 Aug 2017 03:09
DOI: