CUED Publications database

Crystal growth of melt-textured Nd-123 under 1% oxygen partial pressure atmosphere

Kambara, M and HariBabu, N and Shi, Y and Cardwell, DA (2001) Crystal growth of melt-textured Nd-123 under 1% oxygen partial pressure atmosphere. IEEE Transactions on Applied Superconductivity, 11. pp. 3442-3445. ISSN 1051-8223

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Abstract

Crystal growth of melt-textured Nd-123 pseudo-crystals was investigated via an isothermal solidification with top-seeding technique under a 1%O2 in N2 atmosphere. Non-steady state solidification was observed at low undercooling, in contrast to an almost linear growth at higher undercooling. Similar to processing in air, the substitution of Nd/Ba was found to decrease from the seed position to the edge of the crystal. In addition, the volume fraction of Nd-422 particles decreased in the solid as solidification proceeded. As a result of these microstructural inhomogeneities, the critical temperature and the critical current density varied within the crystal even for samples processed isothermally, despite the narrow solid solution range of the Nd-123 phase under a reduced pO2 atmosphere.

Item Type: Article
Uncontrolled Keywords: 1% oxygen partial pressure Crystal growth Nd-123 Non-steady solidification
Subjects: UNSPECIFIED
Divisions: Div C > Materials Engineering
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 13:04
Last Modified: 27 Nov 2014 19:22
DOI: 10.1109/77.919803