The crystal structure of (Nb$_{0.75}$Cu$_{0.25}$)Sn$_{2}$ in the Cu-Nb-Sn system

During the processing of superconducting Nb$_{3}$Sn wire, several intermediate intermetallic phases including a previously encountered Cu-Nb-Sn phase show up. The yet unknown crystal structure of this phase is now identified by a combination of different experimental techniques and database search t...

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Autores principales: Martin, Stefan, Walnsch, Alexander, Nolze, Gert, Leineweber, Andreas, Leaux, Floriane, Scheuerlein, Christian
Publicado: 2016
Materias:
Accelerators and Storage Rings
Acceso en línea:https://dx.doi.org/10.1016/j.intermet.2016.09.008
http://cds.cern.ch/record/2258576
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author Martin, Stefan
Walnsch, Alexander
Nolze, Gert
Leineweber, Andreas
Leaux, Floriane
Scheuerlein, Christian
author_facet Martin, Stefan
Walnsch, Alexander
Nolze, Gert
Leineweber, Andreas
Leaux, Floriane
Scheuerlein, Christian
author_sort Martin, Stefan
collection CERN
description During the processing of superconducting Nb$_{3}$Sn wire, several intermediate intermetallic phases including a previously encountered Cu-Nb-Sn phase show up. The yet unknown crystal structure of this phase is now identified by a combination of different experimental techniques and database search to be of the hexagonal NiMg2 type with a proposed composition of about (Nb0.75Cu0.25)Sn2. The structure determination started from an evaluation of the lattice parameters from EBSD Kikuchi patterns from quenched material suggesting hexagonal or orthorhombic symmetry. A database search then led to the hexagonal NiMg2 type structure, the presence of which was confirmed by a Rietveld analysis on the basis of high energy synchrotron X-ray powder diffraction data. Assuming a partial substitution of Nb in orthorhombic NbSn2 by Cu, the change of the valence electron concentration provokes a structural transformation from the CuMg2 type for NbSn2 to the NiMg2 type for (Nb0.75Cu0.25)Sn2. In the previous literature the (Nb0.75Cu0.25)Sn2 phase described here has occasionally been referred to as Nausite.
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institution Organización Europea para la Investigación Nuclear
publishDate 2016
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spelling cern-22585762019-09-30T06:29:59Zdoi:10.1016/j.intermet.2016.09.008http://cds.cern.ch/record/2258576Martin, StefanWalnsch, AlexanderNolze, GertLeineweber, AndreasLeaux, FlorianeScheuerlein, ChristianThe crystal structure of (Nb$_{0.75}$Cu$_{0.25}$)Sn$_{2}$ in the Cu-Nb-Sn systemAccelerators and Storage RingsDuring the processing of superconducting Nb$_{3}$Sn wire, several intermediate intermetallic phases including a previously encountered Cu-Nb-Sn phase show up. The yet unknown crystal structure of this phase is now identified by a combination of different experimental techniques and database search to be of the hexagonal NiMg2 type with a proposed composition of about (Nb0.75Cu0.25)Sn2. The structure determination started from an evaluation of the lattice parameters from EBSD Kikuchi patterns from quenched material suggesting hexagonal or orthorhombic symmetry. A database search then led to the hexagonal NiMg2 type structure, the presence of which was confirmed by a Rietveld analysis on the basis of high energy synchrotron X-ray powder diffraction data. Assuming a partial substitution of Nb in orthorhombic NbSn2 by Cu, the change of the valence electron concentration provokes a structural transformation from the CuMg2 type for NbSn2 to the NiMg2 type for (Nb0.75Cu0.25)Sn2. In the previous literature the (Nb0.75Cu0.25)Sn2 phase described here has occasionally been referred to as Nausite.CERN-ACC-2017-0017oai:cds.cern.ch:22585762016-09-28
spellingShingle Accelerators and Storage Rings
Martin, Stefan
Walnsch, Alexander
Nolze, Gert
Leineweber, Andreas
Leaux, Floriane
Scheuerlein, Christian
The crystal structure of (Nb$_{0.75}$Cu$_{0.25}$)Sn$_{2}$ in the Cu-Nb-Sn system
title The crystal structure of (Nb$_{0.75}$Cu$_{0.25}$)Sn$_{2}$ in the Cu-Nb-Sn system
title_full The crystal structure of (Nb$_{0.75}$Cu$_{0.25}$)Sn$_{2}$ in the Cu-Nb-Sn system
title_fullStr The crystal structure of (Nb$_{0.75}$Cu$_{0.25}$)Sn$_{2}$ in the Cu-Nb-Sn system
title_full_unstemmed The crystal structure of (Nb$_{0.75}$Cu$_{0.25}$)Sn$_{2}$ in the Cu-Nb-Sn system
title_short The crystal structure of (Nb$_{0.75}$Cu$_{0.25}$)Sn$_{2}$ in the Cu-Nb-Sn system
title_sort crystal structure of (nb$_{0.75}$cu$_{0.25}$)sn$_{2}$ in the cu-nb-sn system
topic Accelerators and Storage Rings
url https://dx.doi.org/10.1016/j.intermet.2016.09.008
http://cds.cern.ch/record/2258576
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