Black magnetic oxide

Black magnetic oxide Black oxide, precipitated Black rouge. See Iron... 

Synonyms Black magnetic oxide Black oxide, precipitated Black rouge Cl 77499 Ethiops iron Ferric ferrous oxide Ferrosoferric oxide Iron oxide Iron (II, III) oxide Iron (III) oxide Iron (II) oxide, black Iron (II, III) oxide, black Iron oxide magnetic Iron oxides (FesOJ Magnetite Pigment black 11 Triiron tetraoxide Classification Syn. iron oxide Empirical FejO,... 

Black magnetic oxide. See Iron oxide black Black manganese oxide. See Manganese dioxide... 

Black magnetic oxide See black iron oxide. 

Black Magnetic Oxide See Black Iron Oxide. 

A solution of 0.5 M ferrous chloride (FeCI2) and 0.25 M ferric chloride (FeCI3) (200 ml) was mixed with 5 M sodium hydroxide (200 ml) at 60°C by pouring both solutions to 100 ml of distilled water. The mixture was stirred for 2 min during which time a black, magnetic precipitate formed. After settling, the volume of the settled precipitate was approximately 175 ml. The concentration of iron oxide in the precipitate was about 60 mg/ml. The precipitate was then washed with water until a pH of 6-8 was reached. 

In the amorphous condition ferrous hydroxide is usually prepared as a white precipitate by addition of sodium or potassium hydroxide to a solution of a ferrous salt in the complete absence of air.6 The precipitate is washed m an atmosphere of nitrogen and dried with ether. If air is present, the precipitate assumes a green colour which becomes greenish black in consequence of the formation of hydrated magnetic oxide, and ultimately turns brown owing to further oxidation to ferric hydroxide. 

When strongly heated with excess of sodium chloride for several hours ferric oxide is converted into black crystals of magnetic oxide.5 Pure iron wire, heated to 1200° C. in a current of carbon dioxide, yields crystalline magnetic oxide, the crystals frequently exhibiting magnetic polarity. The presence of moisture facilitates the formation of larger crystals.6... 

Hydrated Magnetic Oxide.—Magnetic oxide dissolves in hydrochloric acid, and the solution so obtained yields, on pouring into an excess of sodium hydroxide solution, a black precipitate which, on drying, is attracted by a magnet. It is the monohydrate, Fc304.H20. 

Ferrous sulphide has a bluish black appearance, reminiscent of that of magnetic oxide, but it is not magnetic. Density 4 67. It is stable when heated in hydrogen or in the absence of air, but when heated in air it readily oxidises to ferrous sulphate, whilst at red heat all the sulphur is expelled, red ferric oxide remaining. 

When ammonium ferrocyanide, or its double compound with ammonium chloride, is heated, a black magnetic powder is obtained. This, upon ignition in air, is completely transformed into ferric oxide without any change in weight, and is believed 2 to be the dicarbide, FeC2. 

Color pigments, inorganic Ferric oxide pigments Iron blue pigments Iron colors Iron oxide, black Iron oxide, magnetic Iron oxide, yellow Lamp black Lead oxide pigments Lead pigments... 

The ferrous and ferric ions appear in the form of the hydroxides Fe(OH)2 and Fe(OH)3, which combine to form the magnetic oxide FejO. In the presence of other oxides and in accordance with the operating conditions, pigments are obtained ranging in color from yellow to brawn or black. 

Magnetic Oxide—Black oxide—Ferri oxidum magnelwum Br.)—Fe,0, —231.7—is the natural loadstone, and is formed bv the action of air or steam upon iron at high temperatures. It is probably a compound of ferrous and ferric oxides (FeO. Fe,0,), os acids produce with it mixtures of ferrous and ferric salts. 

Ferrosoferric Oxide. Ferric ferrous oxide triiron tetraoxide black iron oxide magnetic iron oxide Ethiops iron. Fe204 mol wt 231.55. Fe 72.36%, O 27.64%. Occurs in nature as the mineral magnetite (red-black lumps). Prepn Gmelin s, Iron (8th ed) part B, 36-62 (1932) Ullmanns EncyklopSdie der Technischen Chemie vol. 6, 420 (1955). Review Robl, ngew. Chem. 70, 367 (1958). 

The chief ores of iron are—1. Clay iron stone, which is a more or less pure carbonate of protoxide, generally containing carbonates of lime and magnesia it accompanies coal beds both in England and in Scotland. 2. Red l ematite, which is pure peroxide or sesqnioxide of iron and brown hematite, which is hydrated peroxide. 3. Black or magnetic oxide of. iron. 

Iron (10 oxide, black Iron (II, NO oxide, black Iron oxide magnetic. See... 

Iron oxide magnetic. See Iron oxide black Iron oxide monohydrate, yellow. See Pigment yellow 42... 

Fe304 iron(II) di iron(III) oxide, tri iron tetroxide) A magnetic oxide of iron it occurs naturally as magnetite. It is formed as a black solid when steam is passed over red-hot iron. 

Magnetite Black mag-no- tlt blak n (1851) Fe304. Magnetic iron oxide. See Black Iron Oxide. 

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