Magnetoelastic transition and negative thermal expansion of Fe2Hf0.83Ta0.17 ribbons

Qi Shen*, Fengqi Zhang, Iulian Dugulan, Niels van Dijk, Ekkes Brück

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Downloads (Pure)


In this work, the magnetocaloric effect and negative thermal expansion in melt-spun Fe2Hf0.83Ta0.17 Laves phase alloys were studied. Compared to arc-melted alloys, which undergo a first-order magnetoelastic transition from the ferromagnetic to the antiferromagnetic phase, melt-spun alloys exhibit a second-order transition. For Fe2Hf0.83Ta0.17 ribbons, we observed a large volumetric coefficient of negative thermal expansion of −19 × 10−6 K−1 over a wide temperature range of 197 – 297 K and a moderate adiabatic temperature change of 0.7 K at 290 K for a magnetic field change of 1.5 T. The magnetic field dependence of the transition temperature (dTt/dµ0H = 4.4 K/T) for the melt-spun alloy is about half that of the arc-melted alloy (8.6 K/T). The origin of second-order phase transition of the melt-spun alloy is attributed to the partially suppressed frustration effect, which is due to the atomic disorder introduced by the rapid solidification.

Original languageEnglish
Article number115482
Number of pages5
JournalScripta Materialia
Publication statusPublished - 2023


  • Magnetocaloric effect
  • Magnetoelastic transition
  • Mössbauer spectroscopy
  • Negative thermal expansion


Dive into the research topics of 'Magnetoelastic transition and negative thermal expansion of Fe2Hf0.83Ta0.17 ribbons'. Together they form a unique fingerprint.

Cite this