METHOD FOR PREPARING PLATE-SHAPED MAGNETIC IRON OXIDE AND PLATE-SHAPED MAGNETIC IRON OXIDE PREPARED BY THE SAME

摘要

The present invention relates to a method for preparing plate-like magnetic iron oxide and plate-like iron oxide obtained thereby. The method for preparing plate-like magnetic iron oxide according to the present invention comprises the steps of: a plate-like ferric oxide (Fe_2O_3) precursor solution forming step in which a ferric salt is mixed with an aqueous alkaline solution to obtain a plate-like ferric oxide (Fe_2O_3) precursor solution; a plate-like ferric oxide (Fe_2O_3) forming step in which the plate-like ferric oxide (Fe_2O_3) precursor solution is subjected to hydrothermal reaction to obtain plate-like ferric oxide (Fe_2O_3); and heat treating the plate-like ferric oxide (Fe_2O_3) under reductive atmosphere to convert the same into triiron tetraoxide (Fe_3O_4), thereby providing plate-like magnetic iron oxide. According to the present invention, it is possible to obtain plate-like iron oxide having high coercive force and micron-scaled magnetic properties.