Atomic-scale analyses of Nb 3 Sn on Nb prepared by vapor diffusion for superconducting radiofrequency cavity applications

A correlative study

Jaeyel Lee*, Sam Posen, Zugang Mao, Yulia Trenikhina, Kai He, Daniel L. Hall, Matthias Liepe, David N Seidman

*Corresponding author for this work

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

We report on atomic-scale analyses of the microstructure of an Nb 3 Sn 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 Nb 3 Sn on a Nb substrate is found and four types of orientation relationships (ORs) at the Nb 3 Sn/Nb interface are identified by electron diffraction or high-resolution scanning transmission electron microscopy (HR-STEM) analyses. Thin Nb 3 Sn grains are observed in regions with a low Sn flux and they have a specific OR: Nb 3 Sn //Nb and Nb 3 Sn //Nb The Nb 3 Sn/Nb interface of thin grains has a large lattice mismatch, 12.3%, between Nb and Nb 3 Sn (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 Nb 3 Sn/Nb interface and remain in the grains due to the slow diffusion of Sn in bulk Nb 3 Sn. 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 Nb 3 Sn/Nb interface provides important information about the formation of imperfections in Nb 3 Sn coatings, such as large thin-regions and Sn-deficient regions, which are critical to the performance of Nb 3 Sn SRF cavities for accelerators.

Original languageEnglish (US)
Article number024001
JournalSuperconductor Science and Technology
Volume32
Issue number2
DOIs
StatePublished - Feb 1 2019

Fingerprint

Vapors
vapors
cavities
Transmission electron microscopy
Electron diffraction
transmission electron microscopy
Coatings
Scanning electron microscopy
Lattice mismatch
coatings
Dislocations (crystals)
Epitaxial growth
Interfacial energy
scanning electron microscopy
interfacial energy
high resolution
Particle accelerators
Fluxes
accelerators
electron diffraction

ASJC Scopus subject areas

  • Ceramics and Composites
  • Condensed Matter Physics
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

Cite this

Lee, Jaeyel ; Posen, Sam ; Mao, Zugang ; Trenikhina, Yulia ; He, Kai ; Hall, Daniel L. ; Liepe, Matthias ; Seidman, David N. / Atomic-scale analyses of Nb 3 Sn on Nb prepared by vapor diffusion for superconducting radiofrequency cavity applications : A correlative study. In: Superconductor Science and Technology. 2019 ; Vol. 32, No. 2.
@article{647598ef9c5c424c91a80e09afbdb79f,
title = "Atomic-scale analyses of Nb 3 Sn 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 Nb 3 Sn 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 Nb 3 Sn on a Nb substrate is found and four types of orientation relationships (ORs) at the Nb 3 Sn/Nb interface are identified by electron diffraction or high-resolution scanning transmission electron microscopy (HR-STEM) analyses. Thin Nb 3 Sn grains are observed in regions with a low Sn flux and they have a specific OR: Nb 3 Sn //Nb and Nb 3 Sn //Nb The Nb 3 Sn/Nb interface of thin grains has a large lattice mismatch, 12.3{\%}, between Nb and Nb 3 Sn (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 Nb 3 Sn/Nb interface and remain in the grains due to the slow diffusion of Sn in bulk Nb 3 Sn. 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 Nb 3 Sn/Nb interface provides important information about the formation of imperfections in Nb 3 Sn coatings, such as large thin-regions and Sn-deficient regions, which are critical to the performance of Nb 3 Sn SRF cavities for accelerators.",
author = "Jaeyel Lee and Sam Posen and Zugang Mao and Yulia Trenikhina and Kai He and Hall, {Daniel L.} and Matthias Liepe and Seidman, {David N}",
year = "2019",
month = "2",
day = "1",
doi = "10.1088/1361-6668/aaf268",
language = "English (US)",
volume = "32",
journal = "Superconductor Science and Technology",
issn = "0953-2048",
publisher = "IOP Publishing Ltd.",
number = "2",

}

Atomic-scale analyses of Nb 3 Sn on Nb prepared by vapor diffusion for superconducting radiofrequency cavity applications : A correlative study. / Lee, Jaeyel; Posen, Sam; Mao, Zugang; Trenikhina, Yulia; He, Kai; Hall, Daniel L.; Liepe, Matthias; Seidman, David N.

In: Superconductor Science and Technology, Vol. 32, No. 2, 024001, 01.02.2019.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Atomic-scale analyses of Nb 3 Sn on Nb prepared by vapor diffusion for superconducting radiofrequency cavity applications

T2 - A correlative study

AU - Lee, Jaeyel

AU - Posen, Sam

AU - Mao, Zugang

AU - Trenikhina, Yulia

AU - He, Kai

AU - Hall, Daniel L.

AU - Liepe, Matthias

AU - Seidman, David N

PY - 2019/2/1

Y1 - 2019/2/1

N2 - We report on atomic-scale analyses of the microstructure of an Nb 3 Sn 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 Nb 3 Sn on a Nb substrate is found and four types of orientation relationships (ORs) at the Nb 3 Sn/Nb interface are identified by electron diffraction or high-resolution scanning transmission electron microscopy (HR-STEM) analyses. Thin Nb 3 Sn grains are observed in regions with a low Sn flux and they have a specific OR: Nb 3 Sn //Nb and Nb 3 Sn //Nb The Nb 3 Sn/Nb interface of thin grains has a large lattice mismatch, 12.3%, between Nb and Nb 3 Sn (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 Nb 3 Sn/Nb interface and remain in the grains due to the slow diffusion of Sn in bulk Nb 3 Sn. 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 Nb 3 Sn/Nb interface provides important information about the formation of imperfections in Nb 3 Sn coatings, such as large thin-regions and Sn-deficient regions, which are critical to the performance of Nb 3 Sn SRF cavities for accelerators.

AB - We report on atomic-scale analyses of the microstructure of an Nb 3 Sn 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 Nb 3 Sn on a Nb substrate is found and four types of orientation relationships (ORs) at the Nb 3 Sn/Nb interface are identified by electron diffraction or high-resolution scanning transmission electron microscopy (HR-STEM) analyses. Thin Nb 3 Sn grains are observed in regions with a low Sn flux and they have a specific OR: Nb 3 Sn //Nb and Nb 3 Sn //Nb The Nb 3 Sn/Nb interface of thin grains has a large lattice mismatch, 12.3%, between Nb and Nb 3 Sn (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 Nb 3 Sn/Nb interface and remain in the grains due to the slow diffusion of Sn in bulk Nb 3 Sn. 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 Nb 3 Sn/Nb interface provides important information about the formation of imperfections in Nb 3 Sn coatings, such as large thin-regions and Sn-deficient regions, which are critical to the performance of Nb 3 Sn SRF cavities for accelerators.

UR - http://www.scopus.com/inward/record.url?scp=85062465068&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=85062465068&partnerID=8YFLogxK

U2 - 10.1088/1361-6668/aaf268

DO - 10.1088/1361-6668/aaf268

M3 - Article

VL - 32

JO - Superconductor Science and Technology

JF - Superconductor Science and Technology

SN - 0953-2048

IS - 2

M1 - 024001

ER -