Iron(III) oxide

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Packing: 1 pcs in a carton Size: 0.042cbm burning time: 40 seconds 100 shots assorted effect fireworks..And you can see more from discount tahiti cruises make up brush Potato Peeling Machine discount lighting outlet bolt like fuse Mini Paper Shredder classic elite yarn freezers and coolers dell business laptop (Redirected from Ferric oxide)Iron(III) oxideOther namesFerric oxideHematiteIdentifiersCAS number1317-60-8[1309-37-1][1309-37-1] (Iron Oxide Red)PropertiesMolecular formulaFe2O3Molar mass159.69 g/molAppearancered-brown solidDensity5.242 g/cm3, solidMelting point1566 (1838 K) decomp.Solubility in waterinsolubleStructureCrystal structurerhombohedralThermochemistryStd enthalpy offormation ?fHo298?825.50 kJ/molHazardsEU classificationnot listedFlash pointnon-flammableRelated compoundsOther anionsIron(II) sulfideOther cationsIron(II) oxideIron(II,III) oxideRuthenium(IV) oxideOsmium(IV) oxideExcept where noted otherwise, data are given formaterials in their standard state(at 25, 100kPa)Infobox referencesIron(III) oxidelso known as ferric oxide, Hematite, red iron oxide, synthetic maghemite, colcothar, or simply rusts one of the several oxide compounds of iron, and has paramagnetic properties. Its chemical formula is Fe2O3.Contents1 Different forms 1.1 Alpha phase 1.2 Beta phase 1.3 Gamma phase 1.4 Epsilon phase 1.5 Other phases 2 Uses 2.1 Magnetic storage 2.2 Polishing 2.3 Chemical 2.4 Pigment 2.5 Biomedical 3 See also 4 General references 5 References 6 External links // Different formsAlpha phase?-Fe2O3 has the rhombohedral, corundum (?-Al2O3) structure and is the most common form. It occurs naturally as the mineral hematite which is mined as the main ore of iron. It is antiferromagnetic below ~260 K (Morin transition temperature), and weak ferromagnetic between 260 K and 950 K (Neel temperature).[1] It is easy to prepare using both thermal decomposition and precipitation in the liquid phase. Its magnetic properties are dependent on many factors, e.g. pressure, particle size, and magnetic field intensity.Beta phaseCubic face centered, metastable, at temperatures above 500 converts to alpha phase. It can be prepared by reduction of hematite by carbon, pyrolysis of iron(III) chloride solution, or thermal decomposition of iron(III) sulfate.Gamma phaseCubic, metastable, converts to the alpha phase at high temperatures. Occurs naturally as the mineral maghemite. Ferrimagnetic. Ultrafine particles smaller than 10 nanometers are superparamagnetic. Can be prepared by thermal dehydratation of gamma iron(III) oxide-hydroxide, careful oxidation of iron(II,III) oxide. The ultrafine particles can be prepared by thermal decomposition of iron(III) oxalate.Epsilon phaseRhombic, shows properties intermediate between alpha and gamma. So far has not been prepared in pure form; it is always mixed with the alpha phase or gamma phases. Material with a high proportion of epsilon phase can be prepared by thermal transformation of the gamma phase. The epsilon phase is metastable, transforming to the alpha phase at between 500 and 750 . Can also be prepared by oxidation of iron in an electric arc or by sol-gel precipitation from iron(III) nitrate.Other phasesHigh pressure, amorphous [1]UsesMagnetic storageIron(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.The majority of recorded information on earth (such as text and photographs) is stored in the form of magnetization patterns on a thin layer of iron(III) oxide. This is probably because the cost per bit of iron-based magnetic media is currently far less than the cost per bit of any known alternative, such as optical discs, paper books, or microfilm. More text and photos are stored on magnetic media than all the paper books and paper photographs in the world.[citation needed]PolishingA 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.Rouge cuts more slowly 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...(and so on)


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