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.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Polymers and Plastics
- Metals and Alloys