The structure of nano sized poorly-crystalline iron oxy-hydroxides

In this thesis the structures of three nano sized poorly-crystalline iron oxy-hydroxides, feroxyhyte, ferrihydrite and schwertmannite, are studied and analyzed with the aim of clarifying some dubious structural features. The widely used Rietveld re�nement and EXAFS analysis are employed in order to address the consistency of the structural models proposed for these materials, one of which, feroxyhyte, is suggested in this thesis. Furthermore, a new computer program exploiting the Reverse Monte Carlo algorithm and the Debye Scattering Equation is presented and used in order to analyze the elusive structures of these iron oxy-hydroxides.