Burstlike first-order transformation studied by semi-adiabatic relaxation calorimetry
Résumé
This paper 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 the 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 as well as 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 which belongs to one of the most promising families of giant magnetocaloric materials.
Domaines
Physique [physics]
Fichier principal
Revised Manuscript.pdf (713.56 Ko)
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Supplemental Material.pdf (400.8 Ko)
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