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What type of substance is Fe3O4 and what does it mean?
Ferroferricoxid is an inorganic compound with the chemical formula Fe3O4. It is a magnet black crystal and is often called magnetic iron dioxide. It can’t be classified as ferrous ferrite [FeO2O2]2 nor as a mixture between iron oxide (FeO2O3). But it can be described as suboxide A compound made of iron and oxide (FeO*Fe2O3). This substance is insoluble with water, alkali solutions and ethanol as well as other organic solvents. Natural ferroferric oxide, which is insoluble when in acid solution, can be easily oxidized into iron oxide (Fe2O3) by humid air. It is used mostly as a pigment and polishing ingredient. It can also be used in the production of audiotapes, telecommunications equipment, and other related products.
What are the chemical and physical properties ferroferric dioxide?
The black Fe3O4 mixed-valence ferriton oxide is also known as iron’s mixed-valence oxide. It has a melting value of 1597degC as well as a density of 5.18g/cm3. It is insoluble with water but soluble in acid solution. It can be found as magnetite in nature. High conductivity and strong submagnetism.
Ferromagnetic and ironimagnetic materials go through a second transition above the Curie temperatures to become paramagnetic. The Curie temperature is 585 for Fe3O4.
Fe3O4 exhibits high electrical conductivity. This unusual electrochemical property can be attributed to electron transfer between Fe2+ & Fe3+.
Ferroferricoxid is created when iron wire is combusted in oxygen. Comparing the free energy of Gibbs produced by the standard mole iron oxide, it was found that Fe3O4 has greatest thermodynamic stability. Therefore, the product is Fe3O4.
On their surfaces, iron and oxygen will form oxides. This is because the chemical compositions of the oxide films are not always uniform. One example is FeO, which is in contact the steel, Fe2O3 and Fe3O4 that are in contact the air, respectively. Perhaps the oxide film on steel’s surface is a mixture between saturated solid solutions and three oxides.
However, the thickness and conditions of oxidation can affect the thickness of an oxide film. The thickness of the oxide film on relatively pure iron in dry atmosphere is not more than 20 angstroms (1.angstrom = 0.01 nanometers). But, in moist environment, the thickness of oxide film on iron can increase significantly, and you can see rust spots. This is when the oxide layer is layered. The metal side is covered by a dense anhydrous layer while the air side is covered with a porous layer of hydration.
Iron reacts to water vapor to create Fe3O4 (and hydrogen).
Fe3O4 has anticorrosion properties. To bluish steel parts (also known blue-burning and baked blue), you use the oxidation effects of alkaline oxygenizing solutions to form a Fe3O4 coating on the steel surfaces. It is used to increase gloss, corrosion resistance and aesthetics.
How to make Fe3O4
There are many ways that ferroferricoxid can be prepared.
Slow oxidation method for ferrous hydroxide: Heat the aqueous solution containing Ferrous Hydroxide precipitation to over 70degC and perform slow oxidation. This will produce uniform regular octahedral particles or cubic single-crystal particles with an edge length around 0.2mm. You can also use air bubbles to oxidize the solution. KNO3 is also an oxidant.
Harber method. If you are skilled in operation, ferroferric dioxide can be obtained with a stoichiometric Fe3.00O4.00 composition. Harber method: To a 2.2L FeSO4*7H2O water, 220g of 20% ammonia is added. The solution is then boiled to remove any air. To boil the concentrated aqueous solution (containing 25.5g of KNO3 in a round-bottom flask equipped with a capillary), you will need a cylindrical-bottom flask.
Alkali addition method: Ferrous sulfate solution is either oxidized using alkali or mixed with ferrous and ferrous salts in a proportion. Then, alkali precipitation and recalcitration are added.
What is Fe3O4 used for?
Ferroferricoxide is a widely used chemical material. It is widely used in building materials as well as automobile brakes and welding. There are many markets for it. Fe3O4 is also known for its high specific gravity and strong magnetic properties, which have made it an excellent choice for wastewater treatment. In addition to its ability to be used as a polishing and pigment agent, ferroferric dioxide can also be used in sewage treatment. To achieve anti-oxidation, anti-rust properties, it can react with some chemical substances. A dense layer of ferroferric dioxide can form on steel surfaces when ferroferricoxid reacts with sodium Nitrite. This is used to slow or prevent the corrosion of steel.
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