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EnglishThe phase transformation kinetics of LaFe11.41Mn0.30Si1.29-H1.65 magnetocaloric compound is addressed by low rate calorimetry experiments. Scans at 1 mK/s show that its first order phase transitions are made by multiple heat flux avalanches. Getting very close to the critical point, when the transition becomes of the second order type, the step-like discontinuous behaviour associated with avalanches is smoothed out and the thermal hysteresis disappears. This result is confirmed by magneto-resistivity measurements and allows to obtain accurate values of the temperature hysteresis (DThyst = 0.37 K) at zero external magnetic field and of the critical field (Hc = 1.19 T). The number and magnitude of heat flux avalanches change as the magnetic field strength is increased, showing the interplay between the intrinsic energy barrier between phases and the microstructural disorder of the sample.
Heterogeneous nucleation and heat flux avalanches in La(Fe, Si)13 magnetocaloric compounds near the critical point / Bennati, C.; Gozzelino, L.; Olivetti, E. S.; Basso, Vittorio. - In: APPLIED PHYSICS LETTERS. - ISSN 0003-6951. - 109:23(2016), p. 231904.
| Titolo: | Heterogeneous nucleation and heat flux avalanches in La(Fe, Si)13 magnetocaloric compounds near the critical point | |
| Autori: | ||
| Data di pubblicazione: | 2016 | |
| Rivista: | ||
| Citazione: | Heterogeneous nucleation and heat flux avalanches in La(Fe, Si)13 magnetocaloric compounds near the critical point / Bennati, C.; Gozzelino, L.; Olivetti, E. S.; Basso, Vittorio. - In: APPLIED PHYSICS LETTERS. - ISSN 0003-6951. - 109:23(2016), p. 231904. | |
| Handle: | http://hdl.handle.net/11696/54603 | |
| Appare nelle tipologie: | 1.1 Articolo in rivista |
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| 127-APL_Bennati.pdf | This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article may be found at DOI https://doi.org/10.1063/1.4971360. | Versione editoriale | PUBBLICO - Tutti i diritti riservati | Visibile a tuttiVisualizza/Apri |
http://hdl.handle.net/11696/54603
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