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Tailoring Negative Thermal Expansion via Tunable Induced Strain in La–Fe–Si-Based Multifunctional Material

Fleming, Rafael Oliveira; Gonçalves, Sofia; Davarpanah, Amin; Radulov, Iliya; Pfeuffer, Lukas; Beckmann, Benedikt; Skokov, Konstantin; Ren, Yang; Li, Tianyi; Evans, John; Amaral, João; Almeida, Rafael; Lopes, Armandina; Oliveira, Gonçalo; Araújo, João Pedro; Apolinário, Arlete; Belo, João Horta


Rafael Oliveira Fleming

Sofia Gonçalves

Amin Davarpanah

Iliya Radulov

Lukas Pfeuffer

Benedikt Beckmann

Konstantin Skokov

Yang Ren

Tianyi Li

João Amaral

Rafael Almeida

Armandina Lopes

Gonçalo Oliveira

João Pedro Araújo

Arlete Apolinário

João Horta Belo


Zero thermal expansion (ZTE) composites are typically designed by combining positive thermal expansion (PTE) with negative thermal expansion (NTE) materials acting as compensators and have many diverse applications, including in high-precision instrumentation and biomedical devices. La(Fe1–x,Six)13-based compounds display several remarkable properties, such as giant magnetocaloric effect and very large NTE at room temperature. Both are linked via strong magnetovolume coupling, which leads to sharp magnetic and volume changes occurring simultaneously across first-order phase transitions; the abrupt nature of these changes makes them unsuitable as thermal expansion compensators. To make these materials more useful practically, the mechanisms controlling the temperature over which this transition occurs and the magnitude of contraction need to be controlled. In this work, ball-milling was used to decrease particles and crystallite sizes and increase the strain in LaFe11.9Mn0.27Si1.29Hx alloys. Such size and strain tuning effectively broadened the temperature over which this transition occurs. The material’s NTE operational temperature window was expanded, and its peak was suppressed by up to 85%. This work demonstrates that induced strain is the key mechanism controlling these materials’ phase transitions. This allows the optimization of their thermal expansion toward room-temperature ZTE applications.


Fleming, R. O., Gonçalves, S., Davarpanah, A., Radulov, I., Pfeuffer, L., Beckmann, B., …Belo, J. H. (2022). Tailoring Negative Thermal Expansion via Tunable Induced Strain in La–Fe–Si-Based Multifunctional Material. ACS Applied Materials and Interfaces, 14(38), 43498-43507.

Journal Article Type Article
Acceptance Date Aug 29, 2022
Online Publication Date Sep 13, 2022
Publication Date Sep 28, 2022
Deposit Date Dec 20, 2022
Publicly Available Date Sep 14, 2023
Journal ACS Applied Materials & Interfaces
Print ISSN 1944-8244
Electronic ISSN 1944-8252
Publisher American Chemical Society
Peer Reviewed Peer Reviewed
Volume 14
Issue 38
Pages 43498-43507


Accepted Journal Article (2.2 Mb)

Copyright Statement
This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Applied Materials & Interfaces, copyright © 2022 American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see

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