Giant negative thermal expansion in Fe-Mn-Ga magnetic shape memory alloys
- Univ. of Science and Technology Beijing, Beijing (China). State Key Lab. for Advanced Metals and Materials
- Argonne National Lab. (ANL), Argonne, IL (United States). X-Ray Sciences Division
- Northern Illinois Univ., DeKalb, IL (United States). Dept. of Physics
- Beijing Inst. of Technology, Beijing (China). School of Materials Science and Engineering
Fe-Mn-Ga magnetic shape memory alloys can undergo martensitic transformation (MT) from a paramagnetic cubic phase to a ferromagnetic tetragonal phase. The MT is accompanied by a large volume change; yet, these alloys have never been explored for technological applications as negative thermal expansion (NTE) materials. Here, by careful chemical modification, tunable NTE characteristics including wide operating temperature windows (Delta T) and large negative linear coefficients of thermal expansion (alpha(l)) have been achieved in Fe44-xMn28Ga28+x (x = 1, 2, and 2.5) alloys. Typically, a giant NTE Delta T of 81 K and alpha(l =) -50.2 x 10(-6) K-1 were realized in the Fe43Mn28Ga29 alloy upon cooling from 290 K. The relationships between the NTE features, the MT, and the substitution of Ga for Fe were discussed. Furthermore, the Fe-Mn-Ga alloys possess excellent mechanical properties, high electrical conductivity and high thermal conductivity. With these advantages, the Fe-Mn-Ga magnetic shape memory alloys show promising prospects for use as advanced NTE materials.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- Chinese Academy of Sciences (CAS); National Natural Science Foundation of China (NNSFC); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
- Grant/Contract Number:
- AC02-06CH11357
- OSTI ID:
- 1480852
- Journal Information:
- Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 4 Vol. 113; ISSN 0003-6951
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
Prediction of fully compensated ferrimagnetic spin-gapless semiconducting FeMnGa/Al/In half Heusler alloys
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journal | May 2019 |
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