Abstract
A new method to prepare plate-shaped Fe 2O 3 nanoparticles was investigated and their magnetic properties were characterised. First, Fe 2O 3 nanoparticles of ~ 6 nm in diameter were synthesised by mechanochemical processing, involving the solid-state exchange reaction Fe 2(SO 4) 3 + 3 Na 2CO 3 → Fe 2(CO 3) 3 + 3 Na 2SO 4 → Fe 2O 3 + 3 Na 2SO 4 + 3 CO 2 (g) effected by high-energy ball milling and subsequent heat treatment at 400 °C. Next, nano-platelets were grown from the nanoparticles by further heat treatment in a salt matrix at 700 °C. Removal of the salt and by-product phases after heat treatment led to well-dispersed platy haematite particles of 20–200 nm in diameter with aspect ratio of 4–10. The hematite nano-platelets were weakly ferromagnetic with coercivity of ~ 160 Oe and remanent magnetisation of 0.2 emu/g.
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