A conversion electron Mössbauer spectroscopy study of pulsed laser treatment at α-Fe2O3/H2O interface
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Magnetite (Fe3O4) has been synthesized for the first time by using pulsed ruby laser induced reactive quenching process at α-Fe2O3/H2O interface. Iron foils (99.99% pure) were oxidised at 450° C for four hours to form a thick layer of α-Fe2O3 on it. These oxidised samples were immersed in water and then treated with ruby laser pulses (λ=0.694 μm, pulse width = 30 ns, energy density = 10 J/cm2). The conversion electron Mössbauer spectroscopy (CEMS) has been used to characterize the laser induced surface modifications. It is shown that laser treated samples show the formation of Fe3O4 phase along with FeO. The stability of magnetite phase in laser treated sample against thermal treatment is also studied by investigating the changes in hyperfine interaction parameters upon vacuum annealing at 300° C.
KeywordsFe3O4 Magnetite Hyperfine Interaction Oxidise Sample Vacuum Annealing
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