Preparation of Nb-Si phases by cathode sputtering, in particulat the superconducting phase of epitactically grown A15-Nb3Si
Description
The search for new superconducting materials with high transition temperatures is concentrated on alloys with a cubic A15 structure (Cr3Si structure). In this paper we present the preparation of metastable A15-Nb3Si which is expected to have a very high transition temperature Tsub(c). The properties of the A15 structure which are relevant for superconductivity are described, in particular the orthogonal chains as the most important structural characteristic, metastability, and the relation between lattice defects and transition temperature. For target compositions of 75% Nb / 25% Si and 80% Nb / 20% Si A15-Nb3Si transition temperatures of Tsub(c) = 5.3 K and Tsub(c) = 7.5 K have been measured respectively, with lattice constants asub(o) = 5.19 A and asub(o) = 5.18 A. (orig.)
Availability note (English)
MF available from INIS under the Report Number.Abstract (German)
Die Suche nach neuen Supraleitern mit zu erwartenden hohen Sprungtemperaturen konzentriet sich u.a. auf Verbindungen in der kubischen A15-Struktur (Cr3Si-Struktur). Ziel der Arbeit war, metastabiles A15-Nb3Si, von dem ein besonders hohes Tsub(c) zu erwarten ist, darzustellen. Die fuer die Supraleitung wesentlichen Eigenschaften der A15-Struktur werden beschrieben, insbesondere die orthogonalen Ketten als herausstechendes Strukturmerkmal, die Metastabilitaet und der Zusammenhang von Gitterstoerungen und Sprungtemperatur. Als Sprungtemperaturen wurden fuer A15-Nb3Si bei einer Targetzusammensetzung 75% Nb/25% Si Tsub(c) = 5,3 K, fuer eine Zusammensetzung 80% Nb/20% Si Tsub(c) = 7,5 K gemessen. Die Gitterkonstanten asub(o) betrugen 5,19 bzw. 5,18 A. (orig.)
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Additional details
Additional titles
- Original title (German)
- Darstellung von Nb-Si-Phasen, insbesondere von supraleitendem, epitaktisch gewachsenem A15-Nb
Publishing Information
- Imprint Pagination
- 193 p.
- Report number
- INIS-mf--7068
INIS
- Country of Publication
- Germany
- Country of Input or Organization
- Germany
- INIS RN
- 13674445
- Subject category
- S36: MATERIALS SCIENCE; S36: MATERIALS SCIENCE;
- Resource subtype / Literary indicator
- Numerical Data, Thesis
- Descriptors DEI
- BETA-W LATTICES; CATHODE SPUTTERING; CRITICAL CURRENT; DEPOSITION; EPITAXY; EXPERIMENTAL DATA; FILMS; INTERMETALLIC COMPOUNDS; NIOBIUM ALLOYS; SILICON ALLOYS; SUPERCONDUCTIVITY; SUPERCONDUCTORS
- Descriptors DEC
- ALLOYS; CRYSTAL LATTICES; CRYSTAL STRUCTURE; CURRENTS; DATA; ELECTRIC CONDUCTIVITY; ELECTRIC CURRENTS; ELECTRICAL PROPERTIES; INFORMATION; NUMERICAL DATA; PHYSICAL PROPERTIES; SPUTTERING; TRANSITION ELEMENT ALLOYS