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Electrochemistry J Elementary Reactions J Endotaxy J Heteroepitaxy J Semiconductors J Spectroscopy, Photoelectron 1 Spectroscopy, X-ray J Thin Film Growth A simple procedure for the production of pyrite (FeS2) thin films starting from the pure elements is presented. A pure, highly (1 10) oriented polycrystalline iron precursor layer could be successfully electrodeposited. Direct sulphurization of those films on Mo foils resulted in pyrite with (200) oriented grains embedded in a randomly oriented matrix. No other iron sulphide phase like e.g. marcasite was observed. XPS shows the presence of at least 97% FeS2. Depth profiles demonstrate the stoichiometric homogeneity across the films.