The Joint Accelerator Conferences Website (JACoW) is an international collaboration that publishes the proceedings of accelerator conferences held around the world.
TY - CONF
AU - Pudasaini, U.
AU - Eremeev, G.V.
AU - Kelley, M.J.
AU - Reece, C.E.
AU - Tuggle, J.
ED - Schaa, Volker RW
ED - He, Yuan
ED - Li, Lu
ED - Zhao, Ning
TI - Insights into Formation of Nb3Sn Film During the Vapor Diffusion Process
J2 - Proc. of SRF2017, Lanzhou, China, July 17-21, 2017
C1 - Lanzhou, China
T2 - International Conference on RF Superconductivity
T3 - 18
LA - english
AB - The potential of Nb3Sn for SRF cavities is widely recognized and renewed R&D efforts continue to bring new insights about material structure and its properties. We have systematically coated niobium with Nb3Sn using "vapor diffusion" under varying coating conditions to elucidate the reaction of tin with niobium at the temperatures of interest. The analysis of the coated samples is revealing new understanding about the two-stage nucleation/deposition ("vapor diffusion") process that allows us to form a hypothesis regarding Nb3Sn formation mechanism. The essential aspect of nucleation is the deposition of a high coverage, nanoscale thin tin film with particle assemblage by decomposition of tin chloride on the niobium surface at temperatures sufficient for reduction of the thick niobium oxide film, usually at about 500°C. The deposition is followed by the reaction of tin from tin vapor with the niobium surface to form Nb3Sn at about 1200°C, where the surface and grain boundaries start to play key role in the formation process initiation and progression. These findings improve understanding of the Nb3Sn growth in the typical vapor diffusion process used for accelerator cavity coatings.
PB - JACoW
CP - Geneva, Switzerland
SP - 539
EP - 542
KW - ion
KW - niobium
KW - experiment
KW - cavity
KW - SRF
DA - 2018/01
PY - 2018
SN - 978-3-95450-191-5
DO - 10.18429/JACoW-SRF2017-TUPB067
UR - http://jacow.org/srf2017/papers/tupb067.pdf
ER -