Synthesis of submicron plate-like hematite without organic additives and reduction to plate-like α-Fe

摘要

Amorphous strontium hexaferrite (SrFe_(12)O_(19)) nanopartides produced by co-precipitation were treated by a hydrothermal synthesis. The strontium in the hexaferrite leached from the structure during the hydrothermal treatment, producing uniform, submicron hexagonal plate-like hematite particles. The residual Sr to Fe ratio in the hematite particles was about 1 ar%, which is lower than that of previously synthesized submicron plate-like hematite with inorganic ions as structure-directing agents. The plate-like hematite particles maintained their shape even after the hydrogen reduction, producing plate-like a-Fe particles having a saturation magnetization of 197 emu/g and a coercivity of 162 Oe.