XPS studies of nitrogen doping niobium used for accelerator applications

Nitrogen doping study on niobium (Nb) samples used for the fabrication of superconducting radio frequency (SRF) cavities was carried out. The samples' surface treatment was attempted to replicate that of the Nb SRF cavities, which includes heavy electropolishing (EP), nitrogen doping and the su...

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Bibliographic Details
Published in:arXiv.org 2018-04
Main Authors: Yang, Ziqin, Lu, Xiangyang, Tan, Weiwei, Zhao, Jifei, Yang, Deyu, Yang, Yujia, He, Yuan, Zhou, Kui
Format: Article
Language:English
Subjects:
Chemical composition
Doping
Etching
Holes
Ion beams
Niobium
Nitrogen
Organic chemistry
Superconductivity
Surface treatment
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Summary:Nitrogen doping study on niobium (Nb) samples used for the fabrication of superconducting radio frequency (SRF) cavities was carried out. The samples' surface treatment was attempted to replicate that of the Nb SRF cavities, which includes heavy electropolishing (EP), nitrogen doping and the subsequent EP with different amounts of material removal. The surface chemical composition of Nb samples with different post treatments has been studied by XPS. The chemical composition of Nb, O, C and N was presented before and after Gas Cluster Ion Beam (GCIB) etching. No signals of poorly superconducting nitrides NbNx was found on the surface of any doped Nb sample with the 2/6 recipe before GCIB etching. However, in the depth range greater than 30nm, the content of N element is below the XPS detection precision scope even for the Nb sample directly after nitrogen doping treatment with the 2/6 recipe.
ISSN:2331-8422
DOI:10.48550/arxiv.1804.07487