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Title: Initial growth of tin on niobium for vapor diffusion coating of Nb 3Sn

Abstract

Nb 3Sn offers significant potential to exceed the performance of niobium for superconducting radio frequency accelerator cavities. The most promising path toward deployment is by tin vapor diffusion coating of Nb cavity interiors via a two step nucleation-then-growth sequence. Reported here is a materials science study of the nucleation process. We manipulated the accessible range of process variables and determined the effect on composition and microstructure using an array of materials characterization tools. Broadly, nucleation deposits tin as a thin surface phase and, under some conditions, as near-micron sized particles as well, resembling Stranski–Krastanov growth. Conditions that impair nucleation promote the formation of defects, such as patches, in subsequent coating growth. Furthermore no significant effect on the subsequently grown coating was found for structures produced during nucleation.

Authors:
 [1];  [2];  [2];  [3];  [4]
  1. College of William and Mary, Williamsburg, VA (United States)
  2. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  3. Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
  4. College of William and Mary, Williamsburg, VA (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1497698
Report Number(s):
JLAB-ACC-18-2869; DOE/OR/23177-4583
Journal ID: ISSN 0953-2048
Grant/Contract Number:  
AC05-06OR23177; SC0014475
Resource Type:
Accepted Manuscript
Journal Name:
Superconductor Science and Technology
Additional Journal Information:
Journal Volume: 32; Journal Issue: 4; Journal ID: ISSN 0953-2048
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Nb3Sn; nucleation; SRF cavity; vapor diffusion coating; Stranski–Krastanov growth

Citation Formats

Pudasaini, Uttar, Eremeev, Grigory V., Reece, Charles E., Tuggle, James, and Kelley, Michael J. Initial growth of tin on niobium for vapor diffusion coating of Nb3Sn. United States: N. p., 2019. Web. doi:10.1088/1361-6668/aafa88.
Pudasaini, Uttar, Eremeev, Grigory V., Reece, Charles E., Tuggle, James, & Kelley, Michael J. Initial growth of tin on niobium for vapor diffusion coating of Nb3Sn. United States. doi:10.1088/1361-6668/aafa88.
Pudasaini, Uttar, Eremeev, Grigory V., Reece, Charles E., Tuggle, James, and Kelley, Michael J. Fri . "Initial growth of tin on niobium for vapor diffusion coating of Nb3Sn". United States. doi:10.1088/1361-6668/aafa88.
@article{osti_1497698,
title = {Initial growth of tin on niobium for vapor diffusion coating of Nb3Sn},
author = {Pudasaini, Uttar and Eremeev, Grigory V. and Reece, Charles E. and Tuggle, James and Kelley, Michael J.},
abstractNote = {Nb3Sn offers significant potential to exceed the performance of niobium for superconducting radio frequency accelerator cavities. The most promising path toward deployment is by tin vapor diffusion coating of Nb cavity interiors via a two step nucleation-then-growth sequence. Reported here is a materials science study of the nucleation process. We manipulated the accessible range of process variables and determined the effect on composition and microstructure using an array of materials characterization tools. Broadly, nucleation deposits tin as a thin surface phase and, under some conditions, as near-micron sized particles as well, resembling Stranski–Krastanov growth. Conditions that impair nucleation promote the formation of defects, such as patches, in subsequent coating growth. Furthermore no significant effect on the subsequently grown coating was found for structures produced during nucleation.},
doi = {10.1088/1361-6668/aafa88},
journal = {Superconductor Science and Technology},
number = 4,
volume = 32,
place = {United States},
year = {2019},
month = {3}
}

Journal Article:
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This content will become publicly available on March 1, 2020
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