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Near-atomic scale chemical analysis of interfaces in a La(Fe,Mn,Si)13-based magnetocaloric material

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Title: Near-atomic scale chemical analysis of interfaces in a La(Fe,Mn,Si)13-based magnetocaloric material
Authors: Wang, S
Douglas, JO
Lovell, E
Wilson, N
Guo, L
Gault, B
Ryan, MP
Giuliani, F
Item Type: Journal Article
Abstract: La(Fe,Mn,Si)13-based magnetocaloric materials are one of the most promising material families for the realisation of near-room temperature magnetic refrigeration. The functional and mechanical properties of these materials crucially depend on their chemistry, which is difficult to control at interfaces between microstructural units. Atom probe tomography was employed to reveal the local elemental distribution at the α-Fe/1:13 phase boundary and the 1:13/1:13 grain boundary. Strong Mn segregation (and Fe depletion) at the α-Fe/1:13 phase boundary suggests the potential effect of phase boundary area on the Curie temperature of the material. A local off-1:13 stoichiometry layer at the 1:13/1:13 grain boundary may adversely affect the magnetocaloric performance. Routes to mitigate the negative effects of interfaces on the functional and mechanical performance of these materials are discussed, in order to achieve durable and efficient operation of magnetic cooling devices.
Issue Date: Feb-2023
Date of Acceptance: 20-Oct-2022
URI: http://hdl.handle.net/10044/1/100437
DOI: 10.1016/j.scriptamat.2022.115143
ISSN: 1359-6462
Publisher: Elsevier BV
Start Page: 1
End Page: 6
Journal / Book Title: Scripta Materialia
Volume: 224
Copyright Statement: © 2022 The Authors. Published by Elsevier Ltd on behalf of Acta Materialia Inc. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
UK Research and Innovation
Funder's Grant Number: EP/V007661/1
Keywords: Materials
0204 Condensed Matter Physics
0912 Materials Engineering
0913 Mechanical Engineering
Publication Status: Published
Article Number: 115143
Online Publication Date: 2022-10-26
Appears in Collections:Materials
Faculty of Natural Sciences

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