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Encyclopedia > Iron oxide
Iron oxide pigment
Iron oxide pigment

Altogether there are sixteen known iron oxides and oxyhydroxides.[1] Iron oxide. ... Iron oxide. ... General Name, symbol, number iron, Fe, 26 Chemical series transition metals Group, period, block 8, 4, d Appearance lustrous metallic with a grayish tinge Standard atomic weight 55. ... An oxide is a chemical compound containing at least one oxygen atom and other elements. ...

Contents

Oxides

Iron(II) oxide, also called ferrous oxide, is a black-colored powder with the chemical formula FeO. It consists of the element iron in the oxidation state of 2 bonded to oxygen. ... Wüstite (FeO) is a rare mineral form of iron(II) oxide found with meteorites and native iron. ... Iron(II,III) oxide is an oxide of iron, containing iron (II) as well as iron (III). ... Magnetite is a ferrimagnetic mineral with chemical formula Fe3O4, one of several iron oxides and a member of the spinel group. ... Iron(III) oxide — also known as ferric oxide, Hematite, red iron oxide, synthetic maghemite, colcothar, or simply rust — is one of the several oxide compounds of iron, and has paramagnetic properties. ... For other uses, see Hematite (disambiguation). ... Maghemite is a member of the family of iron oxides. ...

Hydroxides

Iron (II) hydroxide is an insoluble compound produced when iron (II) ions, from a compund such as iron (II) sulfate react with hydroxide ions. ... Iron(III) oxide-hydroxide (FeO(OH)), also called hydrated iron oxide and yellow iron oxide, is an oxide-hydroxide of iron. ...

Oxide-hydroxides

  • goethite (α-FeOOH),
  • akaganéite (β-FeOOH),
  • lepidocrocite (γ-FeOOH),
  • feroxyhyte (δ-FeOOH),
  • ferrihydrite (Fe5HO8·4H2O approx.)
  • high-pressure FeOOH
  • schwertmannite
  • green rusts FeIIIxFeIIy(OH)3x+2y-z(A-)z; where A- is Cl- or 0.5SO42-

Goethite, named after the German polymath Johann Wolfgang von Goethe, is an iron bearing oxide mineral found in soil and other low temperature environments. ... Akaganéite is an iron(III) oxide-hydroxide / chloride mineral with formula: Fe3+O(OH,Cl) e. ... Lepidocrocite (FeO(OH)), also called esmeraldite or hydrohematite, is an iron oxide-hydroxide mineral. ... Feroxyhyte is and oxide/hydroxide of iron, Fe3+O(OH). ... Ferrihydrite is an iron oxyhydroxide with nominal formula 5Fe2O3·9H2O. Although it is an accepted mineral there is much controversy about its crystal structure and crystal chemistry. ... Schwertmannite is an iron oxide-hydroxide hydrate of chemical formula Fe16O16(OH)y(SO4)z·nH2O. Categories: | | | ...

Uses

Some iron oxides are widely used in ceramic applications, particularly in glazing. Many metal oxides provide the colors in glazes after being fired at high temperatures. This article is about ceramic materials. ... Composite body, painted, and glazed bottle. ...


Iron oxides yield pigments (see Iron oxide pigments). Natural iron oxides pigments are called ochers. Many classic paint colors, such as raw and burnt siennas and umbers, are iron-oxide pigments. These pigments have been used in art since the earliest prehistoric art known, the cave paintings at Lascaux and nearby sites. Iron (III) oxide is typically used. Natural Ultramarine pigment in powdered form. ... Ochre or Ocher (pronounced OAK-ur, from the Greek ochros, yellow) is a color, usually described as golden-yellow or light yellow brown. ... This page is not about Siena, Italy. ... Raw umber Umber is a natural brown clay pigment which contains iron and manganese oxides. ... Cave or Rock Paintings are paintings on cave or rock walls and ceilings, usually dating to prehistoric times. ... Cave painting at Lascaux. ...


Iron pigments are also widely used in the cosmetic field. They are considered to be nontoxic, moisture resistant, and nonbleeding. Iron oxides graded safe for cosmetic use are produced synthetically in order to avoid the inclusion of ferrous or ferric oxides, and impurities normally found in naturally occurring iron oxides. Typically, the Iron(II) oxide pigment is black, while the Iron(III) oxide is red or rust-colored. (Iron compounds other than oxides can be other colors.)


Magnetite (under the name Black Oxide) is used for coating steel tools [2]. This protects them from corrosion and gives a pleasing appearance. A grade of hematite called MIO (micaceous iron oxide) is used as anti-corrosion paint (many bridges, Eiffel tower). Look up mio in Wiktionary, the free dictionary. ...


Iron oxides are used as contrast agent in Magnetic Resonance Imaging, to shorten proton relaxation times, (T1, T2 and T2*). The superparamagnetic contrast agents are composed of a water insoluble crystalline magnetic core, usually magnetite (Fe3O4) or maghemite (γ-Fe2O3). The mean core diameter ranges from 4 to 10 nm. This crystalline core is often surrounded by a layer of dextran or starch derivatives. The total size of the particle is expressed as the mean hydrated particle diameter. USPIO, Ultrasmall Superparamagnetic Iron Oxide nanoparticles, which usually have single crystal cores, have a mean hydrated particle diameter less than 50 nm. MRI redirects here. ... This article or section is in need of attention from an expert on the subject. ...


Properties

  • Iron(III) oxide (Fe2O3) or ferric oxide is also known as hematite (alpha form) or maghemite (gamma form) in its mineral form. As an industrial chemical it is commonly called rouge. Purified, it is used as a coating in magnetic audio and computer media. In a dry or alkaline environment it can cause passivation and inhibits rust, yet it is also a major component of rust.
  • Iron(II,III) oxide (Fe3O4) or ferrous ferric oxide is also known as magnetite or lodestone in its mineral form, a major iron ore. Magnetite forms readily when iron oxidizes underwater, and so is often found inside tanks or below the waterline of ships.

It is not difficult to extract iron from ore as compared to the similarly abundant elements aluminum and titanium. Iron(II) oxide, also called ferrous oxide, is a black-colored powder with the chemical formula FeO. It consists of the element iron in the oxidation state of 2 bonded to oxygen. ... Wüstite (FeO) is a rare mineral form of iron(II) oxide found with meteorites and native iron. ... Powder is a substance that has been crushed into very fine grains. ... This article is about the chemical reaction combustion. ... Iron(III) oxide — also known as ferric oxide, Hematite, red iron oxide, synthetic maghemite, colcothar, or simply rust — is one of the several oxide compounds of iron, and has paramagnetic properties. ... For other uses, see Hematite (disambiguation). ... Maghemite is a member of the family of iron oxides. ... Look up rouge in Wiktionary, the free dictionary. ... A coating is a covering that is applied to an object to protect it or change its appearance. ... Magnetic storage is a term from engineering referring to the storage of data on a magnetised medium. ... Passivation is the process of making a material passive in relation to another material prior to using the materials together. ... For other uses, see Rust (disambiguation). ... Iron(II,III) oxide is an oxide of iron, containing iron (II) as well as iron (III). ... Magnetite Lodestone or loadstone refers to either: Magnetite, a magnetic mineral form of iron(II), iron(III) oxide Fe3O4, one of several iron oxides. ... To oxidize an element or a compound is to increase its oxidation number. ... Aluminum is a soft and lightweight metal with a dull silvery appearance, due to a thin layer of oxidation that forms quickly when it is exposed to air. ... General Name, symbol, number titanium, Ti, 22 Chemical series transition metals Group, period, block 4, 4, d Appearance silvery grey-white metallic Standard atomic weight 47. ...


References

  1. ^ Cornell, RM; Schwertmann, U (2003). The iron oxides: structure, properties, reactions, occurrences and uses. Wiley VCH. ISBN 3-527-30274-3. 
  2. ^ Black Oxide FAQ - EPI - Electrochemical Products, Inc

External links


  Results from FactBites:
 
iron oxide (403 words)
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The steel wool changes color to a more gray appearance which is the iron oxide.
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That the ratio (iron atoms)/(oxygen atoms) is 4/6, or 2/3, and nothing else is an example of the law of definite proportions.
If iron is heated in the presence of less oxygen, it is possible to synthesize another iron oxide, Fe, called magnetite.
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