Synthesis of superconducting Nb3Sn coatings on Nb substrates

E. Barzi, M. Bestetti, F. Reginato, D. Turrioni, S. Franz

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

In the present work the electrochemical and thermal syntheses of superconducting Nb3Sn films are investigated. The Nb3Sn phase is obtained by electrodeposition of Sn layers and Cu intermediate layers onto Nb substrates followed by high temperature diffusion in inert atmosphere. Electrodeposition was performed from aqueous solutions at current densities in the 20-50 mA cm-2 range and at temperatures between 40°C and 50°C. Subsequent thermal treatments were realized to obtain the Nb3Sn superconductive phase. Glow discharge optical emission spectrometry demonstrated that after thermal treatment interdiffusion of Nb and Sn occurred across a thickness of about 13 μm. Scanning electron microscopy allowed accurately measuring the thickness of the Nb3Sn phase, whose average for the various types of film samples was between 5.7 and 8.0 μm. X-ray diffraction patterns confirmed the presence of a cubic Nb3Sn phase (A15 structure) having (210) preferred orientation. The maximum obtained T c was 17.68 K and the B c20 ranged between 22.5 and 23.8 T. With the procedure described in the present paper, coating complex shapes cost-effectively becomes possible, which is typical of electrochemical techniques. Furthermore, this approach can be implemented in classical wire processes such as 'jelly roll' or 'rod in tube', or directly used for producing superconducting surfaces. The potential of this method for superconducting radiofrequency structures is also outlined.

Original languageEnglish
Article number015009
JournalSuperconductor Science and Technology
Volume29
Issue number1
DOIs
Publication statusPublished - 1 Dec 2015
Externally publishedYes

Fingerprint

Electrodeposition
electrodeposition
Heat treatment
coatings
Coatings
electrochemical synthesis
Superconducting films
inert atmosphere
Coating techniques
Glow discharges
superconducting films
Substrates
synthesis
Phase structure
glow discharges
Diffraction patterns
Spectrometry
light emission
Current density
rods

Keywords

  • electrochemical deposition
  • NbSn thin films
  • x-ray diffraction

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics
  • Ceramics and Composites
  • Materials Chemistry
  • Metals and Alloys

Cite this

Synthesis of superconducting Nb3Sn coatings on Nb substrates. / Barzi, E.; Bestetti, M.; Reginato, F.; Turrioni, D.; Franz, S.

In: Superconductor Science and Technology, Vol. 29, No. 1, 015009, 01.12.2015.

Research output: Contribution to journalArticle

Barzi, E. ; Bestetti, M. ; Reginato, F. ; Turrioni, D. ; Franz, S. / Synthesis of superconducting Nb3Sn coatings on Nb substrates. In: Superconductor Science and Technology. 2015 ; Vol. 29, No. 1.
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