Iron(III) oxide

From Academic Kids

Properties
General
Name Iron(III) oxide
Chemical formula Fe2O3
Appearance Red powder
Physical
Formula weight 159.7 amu
Melting point 1838 K (1565 °C)
Density 5.2 ×10³ kg/m³
Crystal structure Corundum
Solubility insoluble
Thermochemistry
ΔfH0liquid ? kJ/mol
ΔfH0solid
S0liquid, 1 bar ? J/mol·K
S0solid 87 J/mol·K
Safety
Ingestion Extremely large or sustained doses may cause iron poisoning.
Inhalation Dust may cause mechanical irritation. Long term exposure to dust may cause mild pneumoconiosis.
Skin No adverse effect reported.
Eyes May cause mechanical irritation. Long term exposure may stain the cornea.
More info Hazardous Chemical Database (http://ull.chemistry.uakron.edu/erd/chemicals/9/8752.html)

SI units were used where possible. Unless otherwise stated, standard conditions were used.

Disclaimer and references </font>

Iron(III) oxide - also known as ferric oxide, red iron oxide, synthetic maghemite, rouge,or rust - is one of several oxide compounds of iron, and is most notable for its ferromagnetic properties. Its chemical formula is Fe2O3.

The mineral form of ferric oxide is hematite; it is mined as the main ore of iron.

Iron(III) oxide is often used in magnetic storage, for example in the magnetic layer of floppy disks. These consist of a thin sheet of Mylar plastic, coated with iron(III) oxide. The particles can be magnetised to represent binary data. MICR (Magnetic Ink Character Recognition) also uses iron(III) oxide compounds, suspended in an ink which can be read by special scanning hardware.

The majority of recorded information on earth (such as text and photographs) is stored in the form of magnetization patterns on a thin layer of iron(III) oxide. This is probably because the cost per bit of iron-based magnetic media is currently far less than the cost per bit of any known alternative, such as optical discs, paper books, or microfilm.

The CAS number of ferric oxide is 1309-37-1.

See also

de:Eisen(III)oxid es:xido de hierro (III)

ja:酸化鉄

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