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TY - CONF AU - Major, M. AU - Alff, L. AU - Arnold, M. AU - Conrad, J. AU - Flege, S. AU - Grewe, R. AU - Pietralla, N. ED - Michel, Peter ED - Arnold, André ED - Schaa, Volker RW TI - Materials Science Investigations of Nitrogen-Doped Niobium for SRF Cavities J2 - Proc. of SRF2019, Dresden, Germany, 30 June-05 July 2019 CY - Dresden, Germany T2 - International Conference on RF Superconductivity T3 - 19 LA - english AB - Niobium is the standard material for superconducting RF (SRF) cavities for particle acceleration. Superconducting materials with higher critical temperature or higher critical magnetic field allow cavities to work at higher operating temperatures or higher accelerating fields, respectively. Enhancing the surface properties of the superconducting material in the range of the penetration depth is also beneficial. One direction of search for new materials with better properties is the modification of bulk niobium by nitrogen doping. In the Nb-N phase diagram, the cubic delta-phase of NbN has the highest critical temperature. Niobium samples were annealed and N-doped in the high-temperature furnace at TU Darmstadt and investigated at its Materials Research Department with respect to structural modifications. Secondary ion mass spectrometry showed at which conditions N-diffusion takes place. X-ray diffraction (XRD) confirmed the appearance of NbN and Nb₂N phases for the optimized doping process. XRD pole figures also showed grain growth during sample annealing. PB - JACoW Publishing CP - Geneva, Switzerland SP - 99 EP - 101 KW - cavity KW - niobium KW - SRF KW - superconducting-RF KW - collider DA - 2019/08 PY - 2019 SN - "" SN - 978-3-95450-211-0 DO - doi:10.18429/JACoW-SRF2019-MOP028 UR - http://jacow.org/srf2019/papers/mop028.pdf ER -