Experimental studies on the solid state diffusion of Cu + In in ZnS and on “Disease”, DIS (Diffusion Induced Segregations), in sphalerite and their geological applications |
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| Authors: | Prof. Dr. K. Bente Dr. T. Doering |
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| Affiliation: | (1) Mineralogisch-Kristallographisches Institut, Universität Göttingen, Göttingen, Germany;(2) Institut für Kristallographie, Mineralogie und Materialwissenschaft, Universität Leipzig, Scharnhorststrasse 20, D-04275 Leipzig, Germany |
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| Abstract: | Isothermal solid state experiments on the diffusion of Cu, Fe, Zn and In and related effects have been carried out in sphalerite single crystals. The driving force for the diffusion and corresponding reactions are chemical potential gradients which are established by differences in sulfur fugacity, oxygen fugacity and the chemical activity between sulfide powders as metal sources and receptor crystals.Studies in the system ZnS-CuInS2 show replacement rims in sphalerite produced by the formation of solid solutions between ZnS and CuInS2. These differences reflect the extent of mutual solid solution. The composition profiles of these rims at different temperatures and sulfur fugacities are calculated to diffusion coefficients for the coupled substitution of Cu+ + In3+ versus 2 Zn2+. The interdiffusion coefficients of (Cu + In) in Fe-free sphalerite at the Fe/FeS sulfur fugacity of the sources obey to the relation: |
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