Steiger 2005c

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Michael Steiger¹
1. Institut für Anorganische und Angewandte Chemie, Universität Hamburg, Germany

Salts in Porous Materials: Thermodynamics of Phase Transitions, Modeling and Preventive Conservation.- In: Restoration of Buildings and Monuments, 11, 6, pp. 419-432 (2005)

Abstract

The thermodynamics of phase equilibria of salts in porous materials is discussed including all relevant phase transition reactions such as crystallization - dissolution, hydration - dehydration, and the freeze-thaw equilibrium of water. The treatment of binary systems, i.e. only one salt and water, yields binary phase diagrams that provide all information required for preventive conservation by environmental control. In the case of salt mixtures, a model approach is more appropriate to predict phase equilibria and safe ranges of environmental conditions. The properties of thermodynamic models are reviewed and several examples for the crystallization behaviour of mixed salt systems are provided. Finally, possible applications of thermodynamic models and their potential limits are discussed.

Volltext

Die vollständige Publikation finden sie unter Datei:RBM, Vol. 11, No. 6, 419-432 (2005)-Steiger.pdf

Als Phase wird ein stofflicher Zustand bezeichnet, der in sich, makroskopisch betrachtet, homogen ist.