Giant negative thermal expansion in Fe-Mn-Ga magnetic shape memory alloys

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • X. M. Sun
  • D. Y. Cong
  • D. E. Brown
  • R. G. Li
  • S. H. Li
  • Z. Yang
  • W. X. Xiong
  • Z. H. Nie
  • L. Wang
  • Y. D. Wang

Detail(s)

Original languageEnglish
Article number041903
Journal / PublicationApplied Physics Letters
Volume113
Issue number4
Publication statusPublished - 23 Jul 2018
Externally publishedYes

Abstract

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 (ΔT) and large negative linear coefficients of thermal expansion (αl) have been achieved in Fe44- xMn28Ga28+ x (x = 1, 2, and 2.5) alloys. Typically, a giant NTE ΔT of 81 K and αl = -50.2 × 10-6K-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.

Bibliographic Note

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Citation Format(s)

Giant negative thermal expansion in Fe-Mn-Ga magnetic shape memory alloys. / Sun, X. M.; Cong, D. Y.; Ren, Y.; Brown, D. E.; Li, R. G.; Li, S. H.; Yang, Z.; Xiong, W. X.; Nie, Z. H.; Wang, L.; Wang, Y. D.

In: Applied Physics Letters, Vol. 113, No. 4, 041903, 23.07.2018.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review