Atomic-scale analyses of Nb3Sn on Nb prepared by vapor diffusion for superconducting radiofrequency cavity applications: a correlative study
Abstract
We report on atomic-scale analyses of the microstructure of an Nb3Sn coating on Nb, prepared by a vapor diffusion process for superconducting radiofrequency (SRF) cavity applications using transmission electron microscopy, electron backscatter diffraction and first-principles calculations. Epitaxial growth of Nb3Sn on a Nb substrate is found and four types of orientation relationships (ORs) at the Nb3Sn/Nb interface are identified by electron diffraction or high-resolution scanning transmission electron microscopy (HR-STEM) analyses. Thin Nb3Sn grains are observed in regions with a low Sn flux and they have a specific OR: Nb3Sn //Nb and Nb3Sn //Nb The Nb3Sn/Nb interface of thin grains has a large lattice mismatch, 12.3%, between Nb and Nb3Sn (002) and a high density of misfit dislocations as observed by HR-STEM. Based on our microstructural analyses of the thin grains, we conclude that the thin regions are probably a result of a slow interfacial migration with this particular OR. The Sn-deficient regions are seen to form initially at the Nb3Sn/Nb interface and remain in the grains due to the slow diffusion of Sn in bulk Nb3Sn. The formation of Sn-deficient regions and the effects of interfacial energies on the formation of Sn-deficient regions at different interfaces are estimated by first-principlesmore »
- Authors:
-
[1];
- Northwestern Univ., Evanston, IL (United States); Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Northwestern Univ., Evanston, IL (United States)
- Cornell Univ., Ithaca, NY (United States)
- Publication Date:
- Research Org.:
- Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- OSTI Identifier:
- 1511670
- Alternate Identifier(s):
- OSTI ID: 1529328
- Report Number(s):
- FERMILAB-PUB]-18-767-TD; FERMILAB-PUB-18-767-TD
Journal ID: ISSN 0953-2048; 1718533
- Grant/Contract Number:
- AC02-07CH11359
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Superconductor Science and Technology
- Additional Journal Information:
- Journal Volume: 32; Journal Issue: 2; Journal ID: ISSN 0953-2048
- Publisher:
- IOP Publishing
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 43 PARTICLE ACCELERATORS
Citation Formats
Lee, Jaeyel, Posen, Sam, Mao, Zugang, Trenikhina, Yulia, He, Kai, Hall, Daniel L., Liepe, Matthias, and Seidman, David N. Atomic-scale analyses of Nb3Sn on Nb prepared by vapor diffusion for superconducting radiofrequency cavity applications: a correlative study. United States: N. p., 2018.
Web. doi:10.1088/1361-6668/aaf268.
Lee, Jaeyel, Posen, Sam, Mao, Zugang, Trenikhina, Yulia, He, Kai, Hall, Daniel L., Liepe, Matthias, & Seidman, David N. Atomic-scale analyses of Nb3Sn on Nb prepared by vapor diffusion for superconducting radiofrequency cavity applications: a correlative study. United States. https://doi.org/10.1088/1361-6668/aaf268
Lee, Jaeyel, Posen, Sam, Mao, Zugang, Trenikhina, Yulia, He, Kai, Hall, Daniel L., Liepe, Matthias, and Seidman, David N. Thu .
"Atomic-scale analyses of Nb3Sn on Nb prepared by vapor diffusion for superconducting radiofrequency cavity applications: a correlative study". United States. https://doi.org/10.1088/1361-6668/aaf268. https://www.osti.gov/servlets/purl/1511670.
@article{osti_1511670,
title = {Atomic-scale analyses of Nb3Sn on Nb prepared by vapor diffusion for superconducting radiofrequency cavity applications: a correlative study},
author = {Lee, Jaeyel and Posen, Sam and Mao, Zugang and Trenikhina, Yulia and He, Kai and Hall, Daniel L. and Liepe, Matthias and Seidman, David N.},
abstractNote = {We report on atomic-scale analyses of the microstructure of an Nb3Sn coating on Nb, prepared by a vapor diffusion process for superconducting radiofrequency (SRF) cavity applications using transmission electron microscopy, electron backscatter diffraction and first-principles calculations. Epitaxial growth of Nb3Sn on a Nb substrate is found and four types of orientation relationships (ORs) at the Nb3Sn/Nb interface are identified by electron diffraction or high-resolution scanning transmission electron microscopy (HR-STEM) analyses. Thin Nb3Sn grains are observed in regions with a low Sn flux and they have a specific OR: Nb3Sn //Nb and Nb3Sn //Nb The Nb3Sn/Nb interface of thin grains has a large lattice mismatch, 12.3%, between Nb and Nb3Sn (002) and a high density of misfit dislocations as observed by HR-STEM. Based on our microstructural analyses of the thin grains, we conclude that the thin regions are probably a result of a slow interfacial migration with this particular OR. The Sn-deficient regions are seen to form initially at the Nb3Sn/Nb interface and remain in the grains due to the slow diffusion of Sn in bulk Nb3Sn. The formation of Sn-deficient regions and the effects of interfacial energies on the formation of Sn-deficient regions at different interfaces are estimated by first-principles calculations. The finding of ORs at the Nb3Sn/Nb interface provides important information about the formation of imperfections in Nb3Sn coatings, such as large thin-regions and Sn-deficient regions, which are critical to the performance of Nb3Sn SRF cavities for accelerators.},
doi = {10.1088/1361-6668/aaf268},
journal = {Superconductor Science and Technology},
number = 2,
volume = 32,
place = {United States},
year = {Thu Dec 20 00:00:00 EST 2018},
month = {Thu Dec 20 00:00:00 EST 2018}
}
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