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Article Dans Une Revue Metrologia Année : 2010

Towards a thermodynamic assessment of transition plateaus

Etienne Gaviot
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Ronan Morice
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Bruno Bêche

Résumé

This second part of the work is devoted to the thermodynamic implications of the results presented in the preceding paper, as heat flow meters (HFMs) were installed within a thermometric fixed-point cell operated with indium. Then, simultaneous measurements of both temperature and heat flow allow us to pinpoint the specific boundaries (solidus and melt-off points) of a given transition plateau. To the best of our knowledge, this work is the first experimental illustration being reported on how to consider a plateau as a specific thermodynamic regime marked with a minimum amount of generated entropy in a metrological fixed-point cell. As a result, a significant relationship linking the boundaries of the plateau and the melting temperature of the material studied is presented. In order to obtain a quantitative understanding of the quality of a given transition process, straightforward thermodynamic considerations allow us to consider both theoretically and experimentally an adimensional parameter defined as the ratio of the entropy generation over the entropy change.

Dates et versions

hal-00659161 , version 1 (12-01-2012)

Identifiants

Citer

Etienne Gaviot, Guillaume Failleau, Ronan Morice, Lionel Camberlein, Frédéric Polet, et al.. Towards a thermodynamic assessment of transition plateaus. Metrologia, 2010, 47 (4), pp.357-362. ⟨10.1088/0026-1394/47/4/002⟩. ⟨hal-00659161⟩
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