Journées d'Étude des Équilibres entre Phases

J. Phys. IV France 11 (2001) Pr10-115-Pr10-122
DOI: 10.1051/jp4:20011016

Discontinuous isoperibolic thermal analysis (DITA) (applied to organic components)

P. Marchand¹, L. Lefebvre¹, L. Courvoisier¹, G. Perez¹, J.-J. Counioux² and G. Coquerel<sup>1

1</sup>  Unité de Croissance Cristalline et de Modélisation Moléculaire (UC2M2), UPRES EA 2659, IRCOF, Université de Rouen, 76821 Mont-Saint-Aignan cedex, France
²  Laboratoire d'Énergétique et de Synthèse Inorganique, UPRES A 5079 du CNRS, Université Claude Bernard Lyon I, 43 boulevard du 11 novembre 1918, 69622 Villeurbanne cedex, France

Abstract
The development of the Discontinuous Isoperibolic Thermal Analysis (ΔITA) aims at setting up a new phase diagram investigation technique efficient in the case of organic component systems. A heterogeneous system (with at least one liquid phase) is kept in isoperibolic conditions and submitted to discontinuous composition shifts by successive additions of a thermostated solvent (or solution). It results in perturbations of the equilibrium state and then physical phenomena which bring the system back to the equilibrium. The phenomena resulting from the addition of liquid (dissolution, dilution...) imply enthalpy changes which cause temperature variations of the system. An adapted exploitation of the temperature versus time signals leads to the determination of the topology of the corresponding phase diagram.

© EDP Sciences 2001