α-Fe₂O₃ nano-platelets prepared by mechanochemical/thermal processing

A new method to prepare plate-shaped Fe₂O₃ nanoparticles was investigated and their magnetic properties were characterised. First, Fe₂O₃ nanoparticles of ~6nm in diameter were synthesised by mechanochemical processing, involving the solid-state exchange reaction Fe₂(SO₄)₃+3 Na₂CO₃→Fe₂(CO₃)₃+3 Na₂SO₄...

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Bibliographic Details
Published in:Powder technology 2011-07, Vol.210 (3), p.198-202
Main Authors: Tsuzuki, T, Schäffel, F, Muroi, M, McCormick, P.G
Format: Article
Language:English
Subjects:
Applied sciences
Byproducts
Carbon dioxide
Chemical engineering
Exact sciences and technology
ferric oxide
Heat treatment
Hematite
magnetic properties
methodology
milling
Miscellaneous
Nanocomposites
Nanomaterials
Nanoparticles
Nanostructure
Solid-solid systems
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Summary:A new method to prepare plate-shaped Fe₂O₃ nanoparticles was investigated and their magnetic properties were characterised. First, Fe₂O₃ nanoparticles of ~6nm in diameter were synthesised by mechanochemical processing, involving the solid-state exchange reaction Fe₂(SO₄)₃+3 Na₂CO₃→Fe₂(CO₃)₃+3 Na₂SO₄→Fe₂O₃+3 Na₂SO₄+ 3 CO₂ (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 20–200nm in diameter with aspect ratio of 4–10. The hematite nano-platelets were weakly ferromagnetic with coercivity of ~160Oe and remanent magnetisation of 0.2emu/g.
ISSN:0032-5910
1873-328X
DOI:10.1016/j.powtec.2011.03.012