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Journal of Materials Science

, Volume 53, Issue 14, pp 10411–10422 | Cite as

Surface characterization of nitrogen-doped Nb (100) large-grain superconducting RF cavity material

  • Arti Dangwal Pandey
  • Guilherme Dalla Lana Semione
  • Alena Prudnikava
  • Thomas F. Keller
  • Heshmat Noei
  • Vedran Vonk
  • Yegor Tamashevich
  • Eckhard Elsen
  • Brian Foster
  • Andreas Stierle
Metals

Abstract

(100) Oriented niobium (Nb) crystals annealed in the vacuum conditions close to that used in mass production of 1.3 GHz superconducting radio frequency cavities for linear accelerators and treated in nitrogen at a partial pressure of 0.04 mbar at temperatures of 800 and 900 °C have been studied. The surfaces of the nitrogen-treated samples were investigated by means of various surface-sensitive techniques, including grazing-incidence X-ray diffraction, X-ray photoemission spectroscopy, and scanning electron microscopy with energy-dispersive X-ray spectroscopy in planar view and on cross-sections prepared by a focused ion beam. The appearance of a dense layer of epitaxial rectangular precipitates has been observed for the Niobium nitrided at 900 °C. Increased nitrogen concentration in the near-surface region was detected by glow-discharge optical-emission spectroscopy, focused ion-beam cross-sectional images and X-ray photoelectron spectroscopy. Crystalline phases of NbO and β-Nb2N were identified by X-ray diffraction. This information was confirmed by X-ray photoelectron measurements, which in addition revealed the presence of Nb2O5, NbON, NbN, and NbN x O y components on the surface. These results establish the near-surface Nb phase composition after high-temperature nitrogen treatment, which is important for obtaining a better understanding of the improved RF cavity performance.

Notes

Acknowledgements

Authors declare that no conflict of interests exist. Support on the material from Xenia Singer, and for the FIB preparation and the SEM analysis by S. Kulkarni at the DESY NanoLab, is acknowledged. We acknowledge the use of the focused ion-beam instrument at the DESY NanoLab funded by the BMBF Grant No. 5K13WC3 (PT-DESY). Authors GSD, AP, and BF acknowledge funding from the BMBF grant no. 05H15GURBB.

Supplementary material

10853_2018_2310_MOESM1_ESM.docx (884 kb)
Supplementary material 1 (DOCX 883 kb)

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Deutsches Elektronen-Synchrotron (DESY)HamburgGermany
  2. 2.Fachbereich Physik, Universität HamburgHamburgGermany
  3. 3.Helmholtz-Zentrum Berlin für Materialien und EnergieBerlinGermany
  4. 4.European Council for Nuclear Research (CERN)GenevaSwitzerland
  5. 5.University of OxfordOxfordUK

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