Verteilung anorganischer Fremdionen bei der Kristallisation von Alkalichloriden |
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Authors: | Jörg Reichert |
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Affiliation: | (1) Mineralogisch-Petrographisches Institut der Universität Tübingen, Deutschland;(2) Department of Earth and Planetary Sciences, University of Pittsburgh, 520 Space Research Coordination Center, 15213 Pittsburgh, Pa., USA |
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Abstract: | Investigations were made on the distribution of the foreign cations Na+, K+, Rb+, Cs+, NH4+, Ca++, Sr++, Ba++ and Pb++ between NaCl-, KCl- and RbCl-single crystals and their aqueous solutions or melts. The growth conditions were kept as constant as possible: large single crystals grew slowly, that is from melts at constant undercooling and from solutions at low and constant supersaturation. The distribution coefficient D=Cs/Clwas calculated for the different systems (Cs=concentration of the foreign substance in the crystal, Cl=concentration of the foreign substance in the liquid phase, both in Mol-%). The different values for D can be explained qualitatively with the help of the ionic radii or by comparing the gain of energy with the expenditure of energy, which play an important part during the process of crystallization.
Meinem hochverehrten Lehrer, Prof. Dr. W. v. Engelhardt, gilt mein besonderer Dank für die Überlassung des interessanten Themas und für seine wertvolle Unterstützung und Beratung während dieser Arbeit. Herrn Prof. Dr. S. Haussühl bin ich für viele Ratschläge und Hinweise zu Dank verpflichtet. Ferner danke ich allen wissenschaftlichen und technischen Mitarbeitern des Tübinger Mineralogischen Instituts, die mir mit Rat und Tat bei der Durchführung dieser Arbeit behilflich waren. |
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