Origin of the enhanced Nb3Sn performance by combined Hf and Ta doping

Abstract In recent years there has been an increasing effort in improving the performance of Nb3Sn for high-field applications, in particular for the fabrication of conductors suitable for the realization of the Future Circular Collider (FCC) at CERN. This challenging task has led to the investigati...

Descripción completa

Guardado en:

Detalles Bibliográficos
Autores principales:	Chiara Tarantini, Fumitake Kametani, Shreyas Balachandran, Steve M. Heald, Laura Wheatley, Chris R. M. Grovenor, Michael P. Moody, Yi-Feng Su, Peter J. Lee, David C. Larbalestier
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/9c5b35165dfd40c99c21ab25d0b179a9
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

id	oai:doaj.org-article:9c5b35165dfd40c99c21ab25d0b179a9
record_format	dspace
spelling	oai:doaj.org-article:9c5b35165dfd40c99c21ab25d0b179a92021-12-02T19:12:33ZOrigin of the enhanced Nb3Sn performance by combined Hf and Ta doping10.1038/s41598-021-97353-w2045-2322https://doaj.org/article/9c5b35165dfd40c99c21ab25d0b179a92021-09-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-97353-whttps://doaj.org/toc/2045-2322Abstract In recent years there has been an increasing effort in improving the performance of Nb3Sn for high-field applications, in particular for the fabrication of conductors suitable for the realization of the Future Circular Collider (FCC) at CERN. This challenging task has led to the investigation of new routes to advance the high-field pinning properties, the irreversibility and the upper critical fields (H Irr and H c2 , respectively). The effect of hafnium addition to the standard Nb-4Ta alloy has been recently demonstrated to be particularly promising and, in this paper, we investigate the origins of the observed improvements of the superconducting properties. Electron microscopy, Extended X-ray Absorption Fine Structure Spectroscopy (EXAFS) and Atom Probe Tomography (APT) characterization clearly show that, in presence of oxygen, both fine Nb3Sn grains and HfO2 nanoparticles form. Although EXAFS is unable to detect significant amounts of Hf in the A15 structure, APT does indeed reveal some residual intragrain metallic Hf. To investigate the layer properties in more detail, we created a microbridge from a thin lamella extracted by Focused Ion Beam (FIB) and measured the transport properties of Ta-Hf-doped Nb3Sn. H c2 (0) is enhanced to 30.8 T by the introduction of Hf, ~ 1 T higher than those of only Ta-doped Nb3Sn, and, even more importantly the position of the pinning force maximum exceeds 6 T, against the typical ~ 4.5–4.7 T of the only Ta-doped material. These results show that the improvements generated by Hf addition can significantly enhance the high-field performance, bringing Nb3Sn closer to the requirements necessary for FCC realization.Chiara TarantiniFumitake KametaniShreyas BalachandranSteve M. HealdLaura WheatleyChris R. M. GrovenorMichael P. MoodyYi-Feng SuPeter J. LeeDavid C. LarbalestierNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-8 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Chiara Tarantini Fumitake Kametani Shreyas Balachandran Steve M. Heald Laura Wheatley Chris R. M. Grovenor Michael P. Moody Yi-Feng Su Peter J. Lee David C. Larbalestier Origin of the enhanced Nb3Sn performance by combined Hf and Ta doping
description	Abstract In recent years there has been an increasing effort in improving the performance of Nb3Sn for high-field applications, in particular for the fabrication of conductors suitable for the realization of the Future Circular Collider (FCC) at CERN. This challenging task has led to the investigation of new routes to advance the high-field pinning properties, the irreversibility and the upper critical fields (H Irr and H c2 , respectively). The effect of hafnium addition to the standard Nb-4Ta alloy has been recently demonstrated to be particularly promising and, in this paper, we investigate the origins of the observed improvements of the superconducting properties. Electron microscopy, Extended X-ray Absorption Fine Structure Spectroscopy (EXAFS) and Atom Probe Tomography (APT) characterization clearly show that, in presence of oxygen, both fine Nb3Sn grains and HfO2 nanoparticles form. Although EXAFS is unable to detect significant amounts of Hf in the A15 structure, APT does indeed reveal some residual intragrain metallic Hf. To investigate the layer properties in more detail, we created a microbridge from a thin lamella extracted by Focused Ion Beam (FIB) and measured the transport properties of Ta-Hf-doped Nb3Sn. H c2 (0) is enhanced to 30.8 T by the introduction of Hf, ~ 1 T higher than those of only Ta-doped Nb3Sn, and, even more importantly the position of the pinning force maximum exceeds 6 T, against the typical ~ 4.5–4.7 T of the only Ta-doped material. These results show that the improvements generated by Hf addition can significantly enhance the high-field performance, bringing Nb3Sn closer to the requirements necessary for FCC realization.
format	article
author	Chiara Tarantini Fumitake Kametani Shreyas Balachandran Steve M. Heald Laura Wheatley Chris R. M. Grovenor Michael P. Moody Yi-Feng Su Peter J. Lee David C. Larbalestier
author_facet	Chiara Tarantini Fumitake Kametani Shreyas Balachandran Steve M. Heald Laura Wheatley Chris R. M. Grovenor Michael P. Moody Yi-Feng Su Peter J. Lee David C. Larbalestier
author_sort	Chiara Tarantini
title	Origin of the enhanced Nb3Sn performance by combined Hf and Ta doping
title_short	Origin of the enhanced Nb3Sn performance by combined Hf and Ta doping
title_full	Origin of the enhanced Nb3Sn performance by combined Hf and Ta doping
title_fullStr	Origin of the enhanced Nb3Sn performance by combined Hf and Ta doping
title_full_unstemmed	Origin of the enhanced Nb3Sn performance by combined Hf and Ta doping
title_sort	origin of the enhanced nb3sn performance by combined hf and ta doping
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/9c5b35165dfd40c99c21ab25d0b179a9
work_keys_str_mv	AT chiaratarantini originoftheenhancednb3snperformancebycombinedhfandtadoping AT fumitakekametani originoftheenhancednb3snperformancebycombinedhfandtadoping AT shreyasbalachandran originoftheenhancednb3snperformancebycombinedhfandtadoping AT stevemheald originoftheenhancednb3snperformancebycombinedhfandtadoping AT laurawheatley originoftheenhancednb3snperformancebycombinedhfandtadoping AT chrisrmgrovenor originoftheenhancednb3snperformancebycombinedhfandtadoping AT michaelpmoody originoftheenhancednb3snperformancebycombinedhfandtadoping AT yifengsu originoftheenhancednb3snperformancebycombinedhfandtadoping AT peterjlee originoftheenhancednb3snperformancebycombinedhfandtadoping AT davidclarbalestier originoftheenhancednb3snperformancebycombinedhfandtadoping
_version_	1718377024229212160

Origin of the enhanced Nb3Sn performance by combined Hf and Ta doping

Ejemplares similares