1. Colossal negative thermal expansion over a wide temperature span in dynamically self-assembled MnCo(Ge,Si)/epoxy composites.
- Author
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Guo, Wenhui, Miao, Xuefei, Yan, Zhubing, Chen, Yunlong, Gong, Yong, Qian, Fengjiao, Xu, Feng, and Caron, Luana
- Subjects
THERMAL expansion ,TRANSITION temperature ,TEMPERATURE - Abstract
The achievement of significant negative thermal expansion (NTE) over a wide temperature range (ΔT
NTE ) 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 Mn0.945 Co1.055 Ge1-x Six 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. Colossal NTE with a coefficient αL of −328.7 × 10−6 /K is achieved over a wide temperature range of 142.9 K between 288.2 and 431.1 K, representing the largest αL among all reported NTE materials. [ABSTRACT FROM AUTHOR]- Published
- 2024
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