The transformation of ferromagnetic properties of Fe3O4 into ferromagnetic properties of α-Fe2O3 by the polyol process, heat treatment, isothermally annealing and sintering
Nguyen Viet Long, Thi Nhat Hang Nguyen, Hong Phuc Le, Van Cuu Ho, Huu Tri Nguyen
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Abstract
In our present research, we have presented research on synthesizing micro/nanosized Fe3O4 (magnetite-type) by the polyol process, heat treatment, annealing and sintering processes. The structural change of the above material from low temperature to high temperature, the magnetic change of ferromagnetism of Fe3O4 into ferromagnetism of α-Fe2O3 when the as-prepared samples of Fe3O4 and α-Fe2O3 oxides are isothermally treated from low temperature to high temperature. Finally, it is experimentally confirmed that a significant structural change of magnetite-type micro/nanosized Fe3O4 oxides into the structure of hematite-type micro/nanosized α-Fe2O3 oxides (hematite-type).
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