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Encyclopedia > Iron(III) oxide
Iron(III) oxide
Sample of iron(III) oxide
Haematite unit cell
General
Other names Ferric oxide
Hematite
Molecular formula Fe2O3
Molar mass 159.69 g/mol
Appearance red-brown solid
CAS number 1317-60-8
[1309-37-1]
[1309-37-1] (Iron Oxide Red)]
Properties
Density and phase 5.24 g/cm3, solid
Solubility in water insoluble
Melting point 1565 °C (1838 K) decomp.
Structure
Coordination
geometry
 ?
Crystal structure rhombohedral
Thermodynamic data
Std enthalpy of
formation
ΔfHo298
−825.50 kJ/mol
Standard molar
entropy
So298
87 J·K−1·mol−1
Hazards
MSDS External MSDS
EU classification not listed
Flash point non-flammable
Supplementary data page
Structure and
properties
n, εr, etc.
Thermodynamic
data
Phase behaviour
Solid, liquid, gas
Spectral data UV, IR, NMR, MS
Related compounds
Other anions Iron(II) sulfide
Other cations Iron(II) oxide
Iron(II,III) oxide
Ruthenium(IV) oxide
Osmium(IV) oxide
Except where noted otherwise, data are given for
materials in their standard state (at 25 °C, 100 kPa)
Infobox disclaimer and references

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. Its chemical formula is Fe2O3. Image File history File links Metadata Size of this preview: 799 × 599 pixelsFull resolution (2221 × 1666 pixel, file size: 1. ... Image File history File links Size of this preview: 800 × 511 pixelsFull resolution (1100 × 702 pixel, file size: 386 KB, MIME type: image/png) File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... Hematite, also spelled haematite, is the mineral form of Iron(III) oxide, (Fe2O3), one of several iron oxides. ... This article or section does not cite any references or sources. ... 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. ... General Name, Symbol, Number oxygen, O, 8 Chemical series nonmetals, chalcogens Group, Period, Block 16, 2, p Appearance colorless (gas) very pale blue (liquid) Standard atomic weight 15. ... This article does not cite any references or sources. ... CAS registry numbers are unique numerical identifiers for chemical compounds, polymers, biological sequences, mixtures and alloys. ... In physics, density is mass m per unit volume V. For the common case of a homogeneous substance, it is expressed as: where, in SI units: ρ (rho) is the density of the substance, measured in kg·m-3 m is the mass of the substance, measured in kg V is... In the physical sciences, a phase is a set of states of a macroscopic physical system that have relatively uniform chemical composition and physical properties (i. ... It has been suggested that this article or section be merged with Solution. ... Impact from a water drop causes an upward rebound jet surrounded by circular capillary waves. ... The melting point of a crystalline solid is the temperature at which it changes state from solid to liquid. ... The coordination geometry of an atom is the geometrical pattern formed by its neighbors in a molecule or a crystal. ... Enargite crystals In mineralogy and crystallography, a crystal structure is a unique arrangement of atoms in a crystal. ... In crystallography, the rhombohedral (or trigonal) crystal system is one of the 7 lattice point groups. ... The standard enthalpy of formation or standard heat of formation of a compound is the change of enthalpy that accompanies the formation of 1 mole of a substance in its standard state from its constituent elements in their standard states (the most stable form of the element at 1 atmosphere... In chemistry, the standard molar entropy is the entropy content of one mole of substance, under conditions of standard temperature and pressure. ... An example MSDS in a US format provides guidance for handling a hazardous substance and information on its composition and properties. ... Council Directive 67/548/EEC of 27 June 1967 on the approximation of laws, regulations and administrative provisions relating to the classification, packaging and labelling of dangerous substances (as amended) is the main European Union law concerning chemical safety. ... The flash point of a flammable liquid is the lowest temperature at which it can form an ignitable mixture with air. ... The refractive index (or index of refraction) of a medium is a measure for how much the speed of light (or other waves such as sound waves) is reduced inside the medium. ... The relative dielectric constant of a material under given conditions is a measure of the extent to which it concentrates electrostatic lines of flux. ... Ultraviolet-Visible Spectroscopy or Ultraviolet-Visible Spectrophotometry (UV/ VIS) involves the spectroscopy of photons (spectrophotometry). ... Infrared spectroscopy (IR Spectroscopy) is the subset of spectroscopy that deals with the IR region of the EM spectrum. ... It has been suggested that NMR Data Processing be merged into this article or section. ... Mass spectrometry (also known as mass spectroscopy (deprecated)[1] or informally, mass-spec and MS) is an analytical technique used to measure the mass-to-charge ratio of ions. ... An electrostatic potential map of the nitrate ion (NO3−). Areas coloured red are lower in energy than areas colored yellow An ion is an atom or group of atoms which have lost or gained one or more electrons, making them negatively or positively charged. ... Iron(II) sulfide is a chemical compound with the formula FeS. In practice, iron sulfides are often non-stoichiometric. ... An electrostatic potential map of the nitrate ion (NO3−). Areas coloured red are lower in energy than areas colored yellow An ion is an atom or group of atoms which have lost or gained one or more electrons, making them negatively or positively charged. ... 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. ... Iron(II,III) oxide is an oxide of iron, containing iron (II) as well as iron (III). ... This article lacks information on the importance of the subject matter. ... In chemistry, the standard state of a material is its state at 1 bar (100 kilopascals) and 25 degrees Celsius (298. ... A blacksmith removing rust with sand prior to welding Rust damage in automobiles can create hidden dangers. ... An oxide is a chemical compound containing an oxygen atom and other elements. ... A chemical compound is a chemical substance of two or more different chemically bonded chemical elements, with a fixed ratio determining the composition. ... 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. ... Simple Illustration of a paramagnetic probe made up from miniature magnets. ... This article or section does not cite any references or sources. ... 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. ... General Name, Symbol, Number oxygen, O, 8 Chemical series nonmetals, chalcogens Group, Period, Block 16, 2, p Appearance colorless (gas) very pale blue (liquid) Standard atomic weight 15. ...

Contents

Different forms

The mineral form of ferric oxide is hematite; it is mined as the main ore of iron. A mineral is a naturally occurring substance formed through geological processes that has a characteristic chemical composition, a highly ordered atomic structure and specific physical properties. ... Hematite, also spelled haematite, is the mineral form of Iron(III) oxide, (Fe2O3), one of several iron oxides. ...


Uses

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 PET film, 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. Magnetic storage is a term from engineering referring to the storage of data on a magnetised medium. ... A floppy disk is a data storage device that is composed of a disk of thin, flexible (floppy) magnetic storage medium encased in a square or rectangular plastic shell. ... Biaxially-oriented polyethylene terephthalate (boPET) polyester film is used for its high tensile strength, chemical and dimensional stability, transparency, gas and aroma barrier properties and electrical insulation. ... The binary numeral system, or base-2 number system, is a numeral system that represents numeric values using two symbols, usually 0 and 1. ... Magnetic Ink Character Recognition, or MICR, is a special kind of optical character recognition technology that was adopted mainly by the U.S. banking industry to facilitate the processing of checks. ... An ink is a liquid containing various pigments and/or dyes used for coloring a surface to render an image or text. ...


A very fine powder of ferric oxide is known as jeweller's rouge, red rouge, or simply rouge. It is used to put the final polish on metallic jewellery and lenses, and historically as a cosmetic. Amber jewellery in the form of pendants Jewellery (also spelled jewelry, see spelling differences) is a personal ornament, such as a necklace, ring, or bracelet, made from jewels, precious metals or other substance. ... A lens. ... For other uses, see Cosmetic. ...


Rouge cuts slower than some modern polishes, such as cerium(IV) oxide, but is still used in optics fabrication and by jewelers for the superior finish it can produce. When polishing gold, the rouge slightly stains the gold, which contributes to the appearance of the finished piece. Rouge is sold as a powder, paste, laced on polishing cloths, or solid bar (with a wax or grease binder). Other polishing compounds are also often called "rouge", even when they do not contain iron oxide. Jewelers remove the residual rouge on jewelry by use of ultrasonic cleaning. Cerium(IV) oxide, ceric oxide, ceria, or sometimes simply cerium oxide or cerium dioxide, is a pale yellow-white powder, CeO2. ... candle wax This page is about the substance. ... Look up grease in Wiktionary, the free dictionary. ...


Iron(III) oxide is used in the production of pure iron in a blast furnace. Iron(III) oxide is also used in an extremely exothermic reaction called a thermite reaction.[1] A thermite mixture using Iron (III) Oxide A thermite mixture using Iron (II,III) Oxide A thermite reaction is a type of aluminothermic reaction in which aluminium metal is oxidized by the oxide of another metal, most commonly iron oxide. ...


2 Al + Fe2O3 → 2 Fe + Al2O3 General Name, Symbol, Number aluminium, Al, 13 Chemical series poor metals Group, Period, Block 13, 3, p Appearance silvery Standard atomic weight 26. ... 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. ... General Name, Symbol, Number oxygen, O, 8 Chemical series nonmetals, chalcogens Group, Period, Block 16, 2, p Appearance colorless (gas) very pale blue (liquid) Standard atomic weight 15. ... 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. ... General Name, Symbol, Number aluminium, Al, 13 Chemical series poor metals Group, Period, Block 13, 3, p Appearance silvery Standard atomic weight 26. ... General Name, Symbol, Number oxygen, O, 8 Chemical series nonmetals, chalcogens Group, Period, Block 16, 2, p Appearance colorless (gas) very pale blue (liquid) Standard atomic weight 15. ...


Iron(III) oxide is also used as a pigment, under names Pigment Black 11, Pigment Brown 6, Pigment Brown 7, and Pigment Red 101 (also Iron Oxide Red). Some of them, eg. Pigment Red 101 and Pigment Brown 6, are Food and Drug Administration (FDA)-approved for use in cosmetics. Natural Ultramarine pigment in powdered form. ... hi “FDA” redirects here. ...


See also

Iron oxide pigment There are a number of iron oxides: Iron oxides Iron(II) oxide or ferrous oxide (FeO) The black-coloured powder in particular can cause explosions as it readily ignites. ... 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. ... // Headline text Magnetite is a ferrimagnetic mineral form of iron(II,III) oxide, with chemical formula Fe3O4, one of several iron oxides and a member of the spinel group. ... Red ochre and yellow ochre (pronounced //, from the Greek ochros, yellow) are pigments made from naturally tinted clay. ... A blacksmith removing rust with sand prior to welding Rust damage in automobiles can create hidden dangers. ...

General references

N. N. Greenwood, A. Earnshaw, Chemistry of the Elements, Pergamon Press, 1984.


Notes

  1. ^ Adlam & Price, Higher School Certificate Inorganic Chemistry, Leslie Slater Price, 1945.

External links


  Results from FactBites:
 
ferric oxide: Definition and Much More from Answers.com (809 words)
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.
Iron(III) oxide is often used in magnetic storage, for example in the magnetic layer of floppy disks.
Is ferric oxide an element or a compound or a homogeneous mixture or a...
Iron(III) oxide - Wikipedia, the free encyclopedia (383 words)
Iron(III) oxide — also known as ferric oxide, Hematite, red iron oxide, synthetic maghemite, colcothar, or simply rust — is one of several oxide compounds of iron, and has ferromagnetic properties.
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.
  More results at FactBites »

 
 

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