Grain-boundary structure and segregation in Nb3Sn coatings on Nb for high-performance superconducting radiofrequency cavity applications

@article{Lee2019GrainboundarySA,
  title={Grain-boundary structure and segregation in Nb3Sn coatings on Nb for high-performance superconducting radiofrequency cavity applications},
  author={Jaeyel Lee and Zugang Mao and Kai He and Zu Hawn Sung and Tiziana Spina and Sung Il Baik and Daniel Leslie Hall and Matthias U. Liepe and David N. Seidman and Sam Posen},
  journal={arXiv: Materials Science},
  year={2019}
}
We report on atomic-scale analyses using high-resolution scanning transmission electron microscopy (HR-STEM), atom-probe tomography (APT), and first-principles calculations to study grain-boundary (GB) segregation behavior of Nb3Sn coatings on Nb, prepared by a vapor-diffusion process for superconducting radiofrequency (SRF) cavity applications. The results reveal Sn segregation at GBs of some Nb3Sn coatings, with a Gibbsian interfacial excess of ~10-20 Sn atoms/nm2. The interfacial width of Sn… 

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