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The thermal dependence of the hyperfine fields and of the relative Mossbauer factors have been used to investigate the oxide-support interaction in the Fe-SiO 2 system. The calcination temperature (698, 898 and 1098 K in N 2 ) has an influence on the nature and particle size of the iron species, while the atmosphere (air and N 2 at 698 K) affects the oxide particle size only...