Structural Refinement of Nanocrystalline TiO2 Samples

Abstract

Iron doping causes the increase of lattice parameters of anatase a and c and unit-cell volume in comparison to the corresponding undoped TiO2 samples. The Rietveld refinement of SAED patterns gave the values of structural parameters (lattice parameters, atomic coordinates, bond length and angles) close to those refined from XRD patterns. The comparison of the phase composition derived from both diffraction techniques confirmed the absence of dynamical scattering in electron diffraction. In this way, we have shown that the application of the Rietveld method originally developed for determining structures from X-ray powder data is possible and useful in electron powder diffraction data analysis of nanocrystalline materials.