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Synthesis and properties of electrospun fibres in the system Er2O3-Fe2O3

The chemistry and physics of RE doped hematite (RE=rare earths), RE orthoferrites and RE-iron garnets were the subject of numerous investigations. These investigations were scientifically motivated due to their specific magnetic, magnetooptical, luminescence and photocatalytic properties. Also, these materials found applications in advanced technologies. In the synthesis of these materials the ceramic and coprecipitation methods are dominantly used. In the present work we report a new synthesis method for their production based on the electrospinning. Electrospun fibres of the system xEr(NO3)3-(1- x)Fe(NO3)3 in polyvinylpyrrolidone/ethanol solution were prepared, then heated at high temperatures. The samples were characterized with XRD, Mössbauer, FT-IR and FE SEM. In the presence of smaller amounts of Er (<10 mol %), besides Er- doped hematite phase, magnetic phase was obtained due to the presence of maghemite (g-Fe2O3) phase. For the ratio Er:Fe=1:1 the erbium orthoferrite (ErFeO3) was formed and for the ratio Er:Fe=3:5 the erbium iron garnet (Er3Fe5O12) was formed. FE SEM confirmed that all these components preserved (or at least partially preserved) 1D (fibres) microstructure.

hematite ; erbium oxide ; electrospinning ; garnet ; orthoferrite

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