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Ultraslow calorimetric studies of the martensitic transformation of NiFeGa alloys: detection and analysis of avalanche phenomena
- Source :
- Journal of Thermal Analysis and Calorimetry 2024
- Publication Year :
- 2024
-
Abstract
- We study the thermal properties of a bulk Ni55Fe19Ga26 Heusler alloy in a conduction calorimeter. At slow heating and cooling rates (1K/h), we compare as-cast and annealed samples. We report a smaller thermal hysteresis after the thermal treatment due to the stabilization of the 14M modulated structure in the martensite phase. In ultraslow experiments (40mK/h), we detect and analyze the calorimetric avalanches associated with the direct and reverse martensitic transformation from cubic to 14M phase. This reveals a distribution of events characterized by a power law with exponential cutoff $p(u) \propto u^{-\varepsilon}\exp(-u/\xi)$ where $\varepsilon\sim 2$ and damping energies $\xi=370$uJ (direct) and $\xi=27$uJ (reverse) that characterize the asymmetry of the transformation.<br />Comment: 13 pages; 6 figures; 3 tables
- Subjects :
- Condensed Matter - Materials Science
Subjects
Details
- Database :
- arXiv
- Journal :
- Journal of Thermal Analysis and Calorimetry 2024
- Publication Type :
- Report
- Accession number :
- edsarx.2405.11636
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1007/s10973-024-13206-4