Superconductivity and Mössbauer effect of Nb3Sn produced by Sn implantation

✍ Scribed by J. M. Söder; B. Stritzker; J. Bolz; J. C. Glass; F. Pobell

• Publisher: Springer US
• Year: 1978
• Tongue: English
• Weight: 534 KB
• Volume: 33
• Category: Article
• ISSN: 0022-2291
• DOI: 10.1007/bf00117062

✦ Synopsis

We have implanted Sn, Ge, and Si into Nb films. The resulting Nb-Sn compounds and their annealing behavior have been analyzed by the M6ssbauer effect and compared to samples obtained by diffusion of Sn into Nb foils. M6ssbauer spectra show that Nb3Sn is obtained lust by implantation, but with a Tc of only 5 K. The 925~ annealing temperature necessary to form the A 15 structure with long-range order of Nb chains and Tc values up to 17.8K is at least 100~ higher in implanted samples than in samples prepared by diffusion of Sn into Nb. This is explained in terms of implantation-induced lattice defects. The metastable AI5 phases of Nb3Ge and Nb3Si could not be formed by Ge or Si implantation, regardless of target or annealing temperature. It is suggested that the high-energy ions only form phases stable at high temperatures and with low Tc values.