Colossal negative thermal expansion over a wide temperature span in dynamically self-assembled MnCo(Ge,Si)/epoxy composites

The achievement of significant negative thermal expansion (NTE) over a wide temperature range (ΔTNTE) has posed a formidable challenge for NTE materials. In the present study, textured MnCo(Ge,Si)/epoxy composites were prepared by magnetic field-assisted dynamic self-assembly of multi-component Mn0....

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Bibliographic Details
Published in:Materials research letters 2024-04, Vol.12 (4), p.315-323
Main Authors: Guo, Wenhui, Miao, Xuefei, Yan, Zhubing, Chen, Yunlong, Gong, Yong, Qian, Fengjiao, Xu, Feng, Caron, Luana
Format: Article
Language:English
Subjects:
Alloys
Composite materials
Germanium
Magnetic fields
magnetocaloric alloy
Magnetostructural transition
MM’X alloy
negative thermal expansion
Phase transitions
Self-assembly
Silicon
Temperature
Thermal expansion
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Summary:The achievement of significant negative thermal expansion (NTE) over a wide temperature range (ΔTNTE) has posed a formidable challenge for NTE materials. In the present study, textured MnCo(Ge,Si)/epoxy composites were prepared by magnetic field-assisted dynamic self-assembly of multi-component Mn0.945Co1.055Ge1-xSix particles. The utilization of multi-component particles with tunable transition temperatures significantly amplifies the temperature range over which the NTE occurs, surpassing the limitations of conventional single-component composites. The textured microstructure enables the extension of lattice-level NTE to reach the macroscopic level, which is manifested by a remarkably large NTE coefficient of −328.7 × 10−6/K between 288.2 and 431.1 K.
ISSN:2166-3831
2166-3831
DOI:10.1080/21663831.2024.2328375