# Heterogeneous nucleation and heat flux avalanches in La(Fe,Si)$\_{13}$ magnetocaloric compounds near the critical point

Source: [Heterogeneous nucleation and heat flux avalanches in La(Fe,Si)$\_{13}$ magnetocaloric compounds near the critical point](<https://www.sota2.com/research/paper/68fa34eb1e209131ce89d666>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2025-10-24T20:59:00.513Z

Authors: C. Bennati, L. Gozzelino, E. S. Olivetti, V. Basso

Published: 2016-09-01T18:10:53.000Z

## Abstract

The phase transformation kinetics of LaFe$\_{11.41}$Mn$\_{0.30}$Si$\_{1.29}$-H$\_{1.65}$ 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 fllux avalanches. Getting very close to the critical point, the step-like discontinuous behavior associated with avalanches is smoothed out and thermal hysteresis disappears. This result is confirmed by magneto-resistivity measurements and allows to measure accurate values of the zero field hysteresis ($\\Delta T\_{hyst}$ = 0.37 K) and of the critical field (H$\_c$ = 1.19 T). The number and magnitude of heat flux avalanches change with magnetic field, showing the interplay between the intrinsic energy barrier between phases and the microstructural disorder of the sample.

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/1609.00332>)

[PDF](<https://arxiv.org/pdf/1609.00332.pdf>)