The Collaborative International Dictionary
Iron oxide \I"ron ox"ide\, n. (Chem.) Any of the oxides of iron, especially ferric oxide.
Wiktionary
n. (context chemistry English) The compound obtained by the reaction of oxygen on iron. Either iron(II) oxide (old term ferrous oxide, chemical formula FeO) or iron(III) oxide (old term ferric oxide, chemical formula Fe2O3). Generally known as ''rust'' when hydrated.
Wikipedia
Iron(III) oxide or ferric oxide is the inorganic compound with the formula FeO. It is one of the three main oxides of iron, the other two being iron(II) oxide (FeO), which is rare, and iron(II,III) oxide (FeO), which also occurs naturally as the mineral magnetite. As the mineral known as hematite, FeO is the main source of iron for the steel industry. FeO is ferromagnetic, dark red, and readily attacked by acids. Iron(III) oxide is often called rust, and to some extent this label is useful, because rust shares several properties and has a similar composition. To a chemist, rust is considered an ill-defined material, described as hydrated ferric 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.
Iron(II) oxide or ferrous oxide is the inorganic compound with the formula FeO. Its mineral form is known as wüstite. One of several iron oxides, it is a black-colored powder that is sometimes confused with rust, which consists of hydrated iron(III) oxide (ferric oxide). Iron(II) oxide also refers to a family of related non-stoichiometric compounds, which are typically iron deficient with compositions ranging from FeO to FeO.
Iron(II,III) oxide is the chemical compound with formula FeO. It occurs in nature as the mineral magnetite. It is one of a number of iron oxides, the others being iron(II) oxide (FeO), which is rare, and iron(III) oxide (FeO) also known as hematite. It contains both Fe and Fe ions and is sometimes formulated as FeO ∙ FeO. This iron oxide is encountered in the laboratory as a black powder. It exhibits permanent magnetism and is ferrimagnetic, but is sometimes incorrectly described as ferromagnetic. Its most extensive use is as a black pigment which is synthesised rather than being extracted from the naturally occurring mineral as the particle size and shape can be varied by the method of production.
Usage examples of "iron oxide".
They traveled to the colorful badlands, a raw painted desert of sedimentary soils, bright bands of reddish iron oxide and green-black copper ore.
The advantage of petroleum coke is that it is low in ash (silica, iron oxide, etc.
And they wanted iron oxide, and magnesium, and a magnetic-field-ball device.
Aarn had to help them, but he was as interested as they, by the thing they turned out finally-a round bomb of thick graphite, filled with a charge of iron oxide and aluminum powder, with a detonator attachment, and a projector that would project it by means of a spring catapult.
You and I know the mountain is only magnetic iron oxide, or iron oxide magnetized by the earth itself.
It is a compound of iron oxide, such as comes off a blacksmith's anvil or the rolls of a rolling-mill, and powdered metallic aluminum.
Farmers mixed their own paint, preferring a nauseating blend of skim milk, lime, linseed oil, and iron oxide -- a mixture that hardened quickly and wore well.
None of the peaks were higher than a few hundred feet and at least three quarters of the surface consisted of deserts containing iron oxide.
They were within half a million klicks of the planet, a dusty, battered rock rimed with iron oxide red and nickel oxide blue.
There is nothing but sand that assays high in iron oxide between Canalopsis, at the junction of the Grand Canal and Lincoln Head.