iron(iii) oxide

caption>Properties
olspan="2" align="center" bgcolor="#FFDEAD"\|General
ame	Iron(III) oxide
a href="/encyclopedia/Chemical-formula" title="Chemical formula">Chemical formula	Fe₂O₃
a href="/encyclopedia/color" title="color">Appearance	Red powder
olspan="2" align="center" bgcolor="#FFDEAD"\|Physical
a href="/encyclopedia/Atomic-weight" title="Atomic weight">Formula weight	159.7 amu
a href="/encyclopedia/Melting-point" title="Melting point">Melting point	1838 K (1565 °C)
a href="/encyclopedia/Density" title="Density">Density	5.2 ×10³ kg/m³
a href="/encyclopedia/Crystal-structure" title="Crystal structure">Crystal structure	Corundum
a href="/encyclopedia/Solubility" title="Solubility">Solubility	insoluble
olspan="2" align="center" bgcolor="#FFDEAD"\|Thermochemistry
a href="/encyclopedia/Standard-enthalpy-change-of-formation" title="Standard enthalpy change of formation">Δ_fH⁰_liquid	? kJ/mol
Delta;_fH⁰_solid
24 kJ/mol
a href="/encyclopedia/Standard-molar-entropy" title="Standard molar entropy">S⁰_{liquid, 1 bar}	? J/mol·K
⁰_solid	87 J/mol·K
olspan="2" align="center" bgcolor="#FFDEAD"\|Safety
ngestion	Extremely large or sustained doses may cause iron poisoning.
nhalation	Dust may cause mechanical irritation. Long term exposure to dust may cause mild pneumoconiosis.
kin	No adverse effect reported.
yes	May cause mechanical irritation. Long term exposure may stain the cornea.
ore info	Hazardous Chemical Database
olspan="2" align="center" bgcolor="#FFDEAD"\| SI units were used where possible. Unless otherwise stated, standard conditions were used. Disclaimer and references

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.

Iron(iii) Oxide

See also