Grain-boundary structure and segregation in Nb3Sn coatings on Nb for high-performance superconducting radiofrequency cavity applications

  title={Grain-boundary structure and segregation in Nb3Sn coatings on Nb for high-performance superconducting radiofrequency cavity applications},
  author={Jaeyel Lee and Zugang Mao and Kai He and Zu Hawn Sung and Tiziana Spina and Sung Il Baik and Daniel Leslie Hall and Matthias U. Liepe and David N. Seidman and Sam Posen},
  journal={arXiv: Materials Science},
We report on atomic-scale analyses using high-resolution scanning transmission electron microscopy (HR-STEM), atom-probe tomography (APT), and first-principles calculations to study grain-boundary (GB) segregation behavior of Nb3Sn coatings on Nb, prepared by a vapor-diffusion process for superconducting radiofrequency (SRF) cavity applications. The results reveal Sn segregation at GBs of some Nb3Sn coatings, with a Gibbsian interfacial excess of ~10-20 Sn atoms/nm2. The interfacial width of Sn… 

Figures from this paper

Development and Characterization of Nb3Sn/Al2O3 Superconducting Multilayers for High-performance Radio-Frequency Applications
Superconducting radio-frequency (SRF) resonator cavities provide extremely high quality factors > 10 at 1-2 GHz and 2K in large linear accelerators of high-energy particles. The maximum accelerating
Development and characterization of Nb3Sn/Al2O3 superconducting multilayers for particle accelerators
The growth and multi-technique characterization of stoichiometric Nb3Sn/Al2O3 multilayers with good superconducting and RF properties are reported, providing a materials platform for the development and optimization of high-performance SIS multilayer which could overcome the intrinsic limits of the Nb cavity technology.
Persistence of the Nb(100) surface oxide reconstruction at elevated temperatures
Helium atom scattering and Auger electron spectroscopy (AES) are used to characterize the (3 × 1)-O reconstruction of the Nb(100) surface at elevated temperatures. Persistent helium diffraction peaks
Temperature Increases and Thermoplastic Microstructural Evolution in Adiabatic Shear-Bands in a High-Strength and High-Toughness 10 wt.% Ni Steel
A 10 wt.% nickel-steel has been developed for high pressures and low-temperature applications, due to its high strength, excellent toughness, and low ductile-to-brittle transition temperature (DBTT).
Temperature increases and thermoplastic microstructural evolution in adiabatic shear bands in a high-strength and high-toughness 10 wt.% Ni steel
Abstract A 10 wt.% nickel-steel has been developed for high pressures and low-temperature applications, due to its high strength, excellent toughness, and low ductile-to-brittle transition
Effect of the density of states at the Fermi level on defect free energies and superconductivity: A case study of Nb3Sn
Although often ignored in first-principles studies of material behavior, electronic free energy can have a profound effect in systems with a high-temperature threshold for kinetics and a high
Analysis of magnetic vortex dissipation in Sn-segregated boundaries in Nb3Sn superconducting RF cavities
We study mechanisms of vortex nucleation in ${\mathrm{Nb}}_{3}\mathrm{Sn}$ superconducting RF (SRF) cavities using a combination of experimental, theoretical, and computational methods. Scanning
Ab initio theory of the impact of grain boundaries and substitutional defects on superconducting Nb3Sn
Grain boundaries play a critical role in applications of superconducting Nb$_3$Sn: in dc applications, grain boundaries preserve the material's intrinsically high critical-current by pinning flux,
Advances in Nb3Sn superconducting radiofrequency cavities towards first practical accelerator applications
Nb3Sn is a promising next-generation material for superconducting radiofrequency cavities, with significant potential for both large scale and compact accelerator applications. However, so far, Nb3Sn


Atomic-scale analyses of Nb3Sn on Nb prepared by vapor diffusion for superconducting radiofrequency cavity applications: a correlative study
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
Analysis of Nb3Sn surface layers for superconducting radio frequency cavity applications
We present an analysis of Nb3Sn surface layers grown on a bulk Niobium (Nb) coupon prepared at the same time and by the same vapor diffusion process used to make Nb3Sn coatings on 1.3 GHz Nb
Grain boundary segregation in a bronze-route Nb3Sn superconducting wire studied by atom probe tomography
Atom probe tomography was used to characterize the A15 phase in a bronze-route Nb3Sn superconducting wire with a bronze matrix composition of Cu–8Sn–0.3Ti (in at.%). We observed depletion of niobium
Structure, chemistry and bonding at grain boundaries in Ni3Al—I. The role of boron in ductilizing grain boundaries
Abstract Boron segregation is known to change the fracture mode from intergranular to transgranular in Ni-rich Ni3Al. This paper addresses the question of why boron segregation at grain boundaries
Specific heat of thin-film A15 superconductors: An anomalous inhomogeneity discovered.
  • Hellman, Geballe
  • Materials Science, Medicine
    Physical review. B, Condensed matter
  • 1987
A model is proposed for a new type of surface segregation applicable in a growing film where the surface mobility is orders of magnitude greater than the bulk mobility and a strong dependence is found on deposition temperature, composition, and microstructure.
Superconducting transport properties of grain boundaries in YBa2Cu3O7 bicrystals.
The grain-boundary critical current densities in bicrystal films prepared by evaporation and postannealing and by laser ablation are in good agreement; this result demonstrates that the transport properties are insensitive to preparation technique and, thus, are not dominated by the diffusion of substrate impurities into the boundary region.
Structure, chemistry and bonding at grain boundaries in Ni3Al—II. The structure of small angle boundaries, Ni-enrichment and its influence on bonding, structure, energy and properties
Abstract Small angle [001] twist boundaries and [001] (110) tilt boundaries in B-free and B-doped Ni-rich Ni 3 Al (76 at. % Ni) were examined using conventional electron microscopy techniques as well
Superconducting Nb 3 Sn cavities with high microwave qualities
As the lower critical flux density B c1 apparently presents no limit for microwave superconductivity, Type II superconductors with a high transition temperature offer advantages over niobium, the
structures of twenty-one (I 10) symmetric tilt grain boundaries (CBS) in an f.c.c. binary alloy 1s investigated with atomistic simulations. The Monte Carlo technique is employed to determine the
Grain boundary compositions, transport and flux pinning of multifilamentary Nb/sub 3/Sn wires
The concentrations of elements at the grain boundaries and inside the grains of the A15 phase were measured in a variety of commercial and laboratory Nb/sub 3/Sn, (Nb,Ta)/sub 3/Sn and (Nb,Ti)/sub