Editing Iron(III) oxide (section)

===Alpha phase===
α-{{chem2|Fe2O3}} has the [[rhombohedral lattice system|rhombohedral]], [[aluminium oxide|corundum]] (α-Al<sub>2</sub>O<sub>3</sub>) structure and is the most common form. It occurs naturally as the mineral [[hematite]], which is mined as the main [[ore]] of iron. It is [[antiferromagnetic]] below ~260 K ([[Morin transition]] temperature), and exhibits weak [[ferromagnetism]] between 260 K and the [[Néel temperature]], 950 K.<ref>{{cite book |first=J. E. |last=Greedan |year=1994 |chapter=Magnetic oxides |title=Encyclopedia of Inorganic chemistry |editor-first=R. Bruce |editor-last=King |publisher=John Wiley & Sons |location=New York |isbn=978-0-471-93620-6 }}</ref> It is easy to prepare using both [[thermal decomposition]] and precipitation in the liquid phase. Its magnetic properties are dependent on many factors, e.g., pressure, particle size, and magnetic field intensity.