Fe?Al-Isomorphie und Strukturwasser in Kristallen vom Jarosit-Alunit-Typ |
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| Authors: | C. H rtig,P. Brand,K. Bohmhammel |
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| Affiliation: | C. Härtig,P. Brand,K. Bohmhammel |
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| Abstract: | Fe? Al-Isomorphism and Structural Water in Crystals of Jarosite-Alunite-Type The isomorphous relation between synthetic Alunite KAl3(OH)6(SO4)2 and Jarosite KFe3(OH)6(SO4)2 is investigated. Chemical analysis, X-ray diffraction and thermal analysis permit to draw conclusions on the stoichiometry of the solid solution. It can be shown that under the chosen synthesis conditions the following results are obtainable: - Iron is preferably built in the crystal lattice of the solid solution.
- There are vacancies on the octahedral positions of aluminium or iron.
- There is always an excess of water in the structure.
Because of the lacking Fe3+/Al3+ charges it seems possible that a partial OH?? H2O substitution exists in the structure. |
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