Surface Segregation in SnO2–Fe2O3 Nanopowders and Effects in Mössbauer Spectroscopy
2005•Wiley Online Library
SnO2–Fe2O3 nanopowders prepared by the polymeric precursor method were studied by
combined conventional and high-resolution techniques. The powders treated at 500 C were
analyzed by EDS local probe associated with HRTEM to directly detect surface segregation
of Fe ions onto SnO2 nanoparticles over a broad range of concentrations. The segregation
of these ions controls the system microstructure by changing the surface energies and acting
as nucleation sites for the formation of a Fe oxide phase (magnetite) at high Fe …
combined conventional and high-resolution techniques. The powders treated at 500 C were
analyzed by EDS local probe associated with HRTEM to directly detect surface segregation
of Fe ions onto SnO2 nanoparticles over a broad range of concentrations. The segregation
of these ions controls the system microstructure by changing the surface energies and acting
as nucleation sites for the formation of a Fe oxide phase (magnetite) at high Fe …
SnO2–Fe2O3 nanopowders prepared by the polymeric precursor method were studied by combined conventional and high-resolution techniques. The powders treated at 500 C were analyzed by EDS local probe associated with HRTEM to directly detect surface segregation of Fe ions onto SnO2 nanoparticles over a broad range of concentrations. The segregation of these ions controls the system microstructure by changing the surface energies and acting as nucleation sites for the formation of a Fe oxide phase (magnetite) at high Fe concentrations. A technologically interesting core–shell-type
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