Untersuchung komplexer und kovalenter Eisenverbindungen mit Hilfe des M��bauer-Effekts von Fe57

Abstract

A number of complex and covalent iron compounds in the oxydation states 0, +2, +3, +6 and with coordination numbers 4, 5, 6 has been investigated at different temperatures. A source of Co57 in Pd has been made, which was shown to be well suited for such measurements. The influence of the cristalline environment has been studied by putting iron complexes in different lattices. Ligands of iron complexes have been exchanged to look for influences of different bonds. It has been shown that measurements are also possible in frozen solutions and applications of this method are discussed. It has been found that in Prussian blue and Turnbulls blue there is no socalled electron exchange between the different Fe. The Curie point of KFeS2 has been determined to be −28° C and it was possible to study the fields and lineshifts in its neighbourhood. For some compounds indications for their structure and the sign of the electric field gradient could be derived from the data. The data are compiled in tables to allow further discussions from different points of view.