A plug‐in (EXTRAX) has been developed for ImageJ– a public domain Java‐based program widely used for image processing and analysis in microscopy. This plug‐in allows the extraction and measurement of intensities from electron diffraction spot patterns with a semi‐automatic peak location based on a two‐dimensional lattice given by the user. It is also possible to take into account supplementary spots originating from high‐order Laue zones and/or the existence of a modulation vector.
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 LaFe 10.77 Si 1.23 Co 0.28 compound which belongs to one of the most promising families of giant magnetocaloric materials.
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