Burstlike first-order transformation studied by semi-adiabatic relaxation calorimetry

This article reports on a mode of analysis of semi-adiabatic relaxation data allowing to account for exotic phenomena sometimes observed in first-order transitions. The principal interest is to get a detailed characterization of latent heat while using the same experimental configuration as that emp...

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Bibliographic Details
Published in:Journal of applied physics 2021-10, Vol.130 (16)
Main Authors: Hardy, V., Hamane, R., Larose, X., Risser, M., Guillou, F.
Format: Article
Language:English
Subjects:
Adiabatic flow
Applied physics
Differential scanning calorimetry
Heat exchange
Heat measurement
Latent heat
Magnetic materials
Physics
Recalescence
Specific heat
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Summary:This article reports on a mode of analysis of semi-adiabatic relaxation data allowing to account for exotic phenomena sometimes observed in first-order transitions. The principal interest is to get a detailed characterization of latent heat while using the same experimental configuration as that employed for accurate heat capacity measurements outside the transition. Special attention is paid to the recalescence/antirecalescence effects and to the existence of spikes in the time-dependent exchange of latent heat. The present approach—based on the notion of “power of latent heat”—is shown to be consistent with differential scanning calorimetry, magnetization measurements, and the usual analysis in terms of heat capacity. The study is carried out on a LaFe10.77Si1.23Co0.28 compound that belongs to one of the most promising families of giant magnetocaloric materials.
ISSN:0021-8979
1089-7550
DOI:10.1063/5.0070977