Iron oxide

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Iron oxide pigment

Role of iron oxides

Iron oxides are chemical compounds composed of iron and oxygen. All together, there are sixteen known iron oxides and oxyhydroxides.^[1]

Iron oxides and oxide-hydroxides are widespread in nature, play an important role in many geological and biological processes, and are widely used by humans, e.g., as iron ores, pigments, catalysts, in thermite (see the diagram) and hemoglobin. Common rust is a form of iron(III) oxide. Iron oxides are widely used as inexpensive, durable pigments in paints, coatings and colored concretes. Colors commonly available are in the "earthy" end of the yellow/orange/red/brown/black range. When used as a food coloring, it has E number E172.

Contents

  [hide] 

• 1 Oxides

• 2 Hydroxides

• 3 Oxide/hydroxides

• 4 Microbial degradation

• 5 See also

• 6 References

• 7 External links

Oxides[edit]

• iron(II) oxide, wüstite (FeO)

• iron(II,III) oxide, magnetite (Fe₃O₄)

• (Fe₄O₅)^[2]

• (Fe₄O₃)

• iron(III) oxide (Fe₂O₃)

  • alpha phase, hematite (α-Fe₂O₃)

  • beta phase, (β-Fe₂O₃)

  • gamma phase, maghemite (γ-Fe₂O₃)

  • epsilon phase, (ε-Fe₂O₃)

Hydroxides[edit]

• iron(II) hydroxide (Fe(OH)₂)

• iron(III) hydroxide (Fe(OH)₃), (bernalite)

Oxide/hydroxides[edit]

Main article: iron(III) oxide-hydroxide

• goethite (α-FeOOH),

• akaganéite (β-FeOOH),

• lepidocrocite (γ-FeOOH),

• feroxyhyte (δ-FeOOH),

• ferrihydrite (Fe₅HO₈·4H₂O approx.), or 5Fe₂O₃•9H₂O, better recast as FeOOH•0.4H₂O

• high-pressure FeOOH

• schwertmannite (ideally Fe₈O₈(OH)₆(SO)·nH₂O or Fe³⁺₁₆O₁₆(OH,SO₄)_12-13·10-12H₂O)^[3]

• green rust (Fe^III_xFe^II_y(OH)_3x+2y-z(A⁻)_z; where A⁻ is Cl⁻ or 0.5SO₄²⁻)

Microbial degradation[edit]

Several species of bacteria, including Shewanella oneidensis, Geobacter sulfurreducens and Geobacter metallireducens metabolically utilize solid iron oxides as a terminal electron acceptor, reducing Fe(III) oxides to Fe(II) containing oxides.^[4]

See also[edit]

• Limonite

• Iron oxide nanoparticles

References[edit]

1. Jump up^ Cornell, RM; Schwertmann, U (2003). The iron oxides: structure, properties, reactions, occurrences and uses. Wiley VCH. ISBN 3-527-30274-3.

2. Jump up^ "Discovery of the recoverable high-pressure iron oxide Fe4O5". Oct 2011.

3. Jump up^ http://www.mindat.org/min-7281.html Mindat

4. Jump up^ Bretschger, O.; Obraztsova, A.; Sturm, C. A.; Chang, I. S.; Gorby, Y. A.; Reed, S. B.; Culley, D. E.; Reardon, C. L.; Barua, S.; Romine, M. F.; Zhou, J.; Beliaev, A. S.; Bouhenni, R.; Saffarini, D.; Mansfeld, F.; Kim, B.-H.; Fredrickson, J. K.; Nealson, K. H. (20 July 2007). "Current Production and Metal Oxide Reduction by Shewanella oneidensis MR-1 Wild Type and Mutants". Applied and Environmental Microbiology 73 (21): 7003–7012. doi:10.1128/AEM.01087-07.

External links[edit]

	Wikimedia Commons has media related to Iron oxides.

• Information from Nano-Oxides, Inc. on Fe₂O₃.

• http://chemed.chem.purdue.edu/demos/demosheets/12.3.html

• http://minerals.usgs.gov/minerals/pubs/commodity/iron_oxide/

• CDC - NIOSH Pocket Guide to Chemical Hazards

Authority control NDL: 01057379

Categories: 

• Iron compounds

• Oxides

• Iron oxide pigments