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

doi:10.1063/1.4971360

The 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:	Bennati, C. Gozzelino, L. OLIVETTI, ELENA SONIA BASSO, VITTORIO mostra contributor esterni nascondi contributor esterni
Data di pubblicazione:	2016
Rivista:	APPLIED PHYSICS LETTERS
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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