Steiger.etal 1996

Michael Steiger¹, Anke Zeunert¹:

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

Crystallization Properties of Salt Mixtures: Comparison of Experimental Results and Model Calculations. In: Josef Riederer (Hg.): 8th International Congress on Deterioration and Conservation of Stone, Berlin, 30. Sept. - 4. Oct. 1996, Volume 1, pp. 535 - 544.

Abstract

A chemical model is used to examine the phase behaviour of salt mixtures. The principal types of phase changes including crystallization/dissolution, hydration/dehydration and the formation and decomposition of double salts are illustrated for simple mixtures of two salts. The model is successfully applied to predict the crystallization properties of a four-component system. It is shown how several possible sequences of salt deposition and phase transformations are induced by changes of the ambient relative humidity. In addition an X-ray diffraction technique is presented which can be used to study the phase behaviour of salts under controlled conditions of temperature and relative humidity.

Volltext

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