Purification and single crystal growth of niobium by combined zone refining and electrotransport

High quality, high purity Nb single crystals were produced by combining DC electrotransport with float-zone refining. A significant improvement in residual resistivity ratio, RRR ( ϱ 300 K/ ϱ 4.2 K), and crystal quality is observed when the directions of the applied field and the zone motion are par...

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Published inPhysica. B, Condensed matter Vol. 204; no. 1; pp. 363 - 366
Main Authors Malang, E.U., Oglesby, C.S., Siegrist, T., Bucher, E.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 1995
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Summary:High quality, high purity Nb single crystals were produced by combining DC electrotransport with float-zone refining. A significant improvement in residual resistivity ratio, RRR ( ϱ 300 K/ ϱ 4.2 K), and crystal quality is observed when the directions of the applied field and the zone motion are parallel. A reduction in RRR is observed when the directions are opposed. The best crystals produced had RRRs up to 2600, which is nearly a factor of 2 higher than that achieved by zone refining alone.
Bibliography:ObjectType-Article-2
SourceType-Scholarly Journals-1
ObjectType-Feature-1
content type line 23
ISSN:0921-4526
1873-2135
DOI:10.1016/0921-4526(94)00288-7