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TY - CONF AU - Spradlin, J.K. AU - Palczewski, A.D. AU - Reece, C.E. AU - Tian, H. ED - Michel, Peter ED - Arnold, André ED - Schaa, Volker RW TI - Analysis of Surface Nitrides Created During "Doping" Heat Treatments of Niobium 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 - The benefits of reduced RF losses from interstitial "doping" of niobium are well established. Many of the details involved in the process remain yet to be elucidated. The niobium surface reacted with low-pressure nitrogen at 800°C presents a surface with chemical reactivity different than standard niobium. While standard "recipes" are being used to produce cavities, we seek additional insight into the chemical processes that may be used to remove the "undesirable" as-formed surface layer. This may lead to new processing routes or quality assurance methods to build confidence that all surface "nitrides" have been removed. We report a series of alternate chemistry treatments and subsequent morphological examinations and interpret the results. We also introduce a new standardized Nb sample system in use for efficient characterization of varying doping protocols and cross-laboratory calibration. PB - JACoW Publishing CP - Geneva, Switzerland SP - 106 EP - 111 KW - niobium KW - cavity KW - SRF KW - lattice KW - controls DA - 2019/08 PY - 2019 SN - "" SN - 978-3-95450-211-0 DO - doi:10.18429/JACoW-SRF2019-MOP030 UR - http://jacow.org/srf2019/papers/mop030.pdf ER -