Specific heat and entropy change during martensitic transformation in Ni50Mn50-xGax ferromagnetic shape memory alloys

Xiao Xu, Takeshi Kanomata, Ryosuke Kainuma

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)


Specific heat was systematically measured for Ni50Mn 50-xGax ferromagnetic shape memory alloys near the martensitic transformation temperatures. Martensitic and intermediate transformations and magnetic transitions in the parent and martensite phases were directly observed via specific heat measurements. Entropy change during the intermediate transformation was successfully estimated by direct measurement. Entropy change during the martensitic transformation was also analyzed; it generally decreases with decreasing Ga concentration. Anomalous behavior of the entropy change during martensitic transformation was observed near the magnetic transitions, and was found to attributable to the magnetic contribution by a qualitative examination based on the results of specific heat measurements.

Original languageEnglish
Pages (from-to)159-167
Number of pages9
JournalActa Materialia
Publication statusPublished - 2014 Oct 15


  • Entropy change
  • Ferromagnetic shape memory alloy
  • Magnetostructural transformations
  • Ni-Mn-Ga
  • Specific heat

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

Fingerprint Dive into the research topics of 'Specific heat and entropy change during martensitic transformation in Ni<sub>50</sub>Mn<sub>50-x</sub>Ga<sub>x</sub> ferromagnetic shape memory alloys'. Together they form a unique fingerprint.

Cite this