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Iron oxide : ウィキペディア英語版
Iron oxide

Iron oxides are chemical compounds composed of iron and oxygen. All together, there are sixteen known iron oxides and oxyhydroxides.
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.
==Oxides==
* iron(II) oxide, wüstite (FeO)
* iron(II,III) oxide, magnetite (Fe3O4)
* (Fe4O5)〔 〕
* (Fe4O3)
* iron(III) oxide (Fe2O3)
*
* alpha phase, hematite (α-Fe2O3)
*
* beta phase, (β-Fe2O3)
*
* gamma phase, maghemite (γ-Fe2O3)
*
* epsilon phase, (ε-Fe2O3)
==Hydroxides==

* iron(II) hydroxide (Fe(OH)2)
* iron(III) hydroxide (Fe(OH)3), (bernalite)

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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