Ammonium Metatungstate (AMT) crystals are an important tungstate compound with a well-defined chemical structure and properties. Below is a detailed explanation of Ammonium Metatungstate Crystals:
Ammonium Metatungstate Crystal Chemical Formula and Structure
The chemical formula of ammonium metatungstate is (NH4)6H2W12O40-xH2O, where W stands for elemental tungsten, O stands for elemental oxygen, and NH4 stands for ammonium ion. The structure of ammonium metatungstate consists of tungsten-oxygen octahedra and ammonium oxide ions. The tungsten-oxygen octahedron is composed of 12 oxygen atoms with 12 tungsten atoms attached around it. The ammonium oxide ion, on the other hand, is composed of an amino ion and four oxygen atoms. These tungsten-oxygen octahedra and ammonium oxide ions are interconnected by hydrogen bonds, forming a stable three-dimensional structure.
Physical Properties of Ammonium Metatungstate Crystals
Ammonium metatungstate crystals are a white or slightly yellow crystalline powder, soluble in water but insoluble in ethanol.
The solubility of ammonium metatungstate is 303.99/100g H2O at twenty degrees Celsius, which indicates that its solubility in water is very good. The aqueous solution of ammonium metatungstate is very stable, the composition is harmless and has weak acidity.
Application fields of Ammonium Metatungstate Crystals
Ammonium metatungstate crystals are widely used in many fields, such as electronics, metallurgy, aerospace, chemistry and petrochemistry. In the electronics industry, ammonium metatungstate is used in the manufacture of electronic components and batteries, such as film capacitors and piezoresistive materials. In metallurgical industry, ammonium metatungstate can be used to produce high purity tungsten products, such as ammonium tungstate and barium tungstate. Ammonium metatungstate can also be used as raw material for the production of tungsten-based alloys and coatings in the aerospace industry, as well as tungsten-based catalysts in the chemical industry.
Ammonium metatungstate crystal preparation method
Ammonium metatungstate crystals can be prepared by a variety of chemical and physical methods, including thermal decomposition. One of the commonly used preparation methods is to thermally decompose a mixture of ammonium paratungstate (APT) and a small amount of citric acid catalyst, and obtain ammonium metatungstate crystals after thermal decomposition, boiling, evaporation and concentration, crystallization, filtration and separation, and granulation.
In summary, ammonium metatungstate crystal is an important tungstate compound with specific chemical formula, structure and physical properties. It is widely used in many fields and is an important raw material for electronics, metallurgy, aerospace, chemical and petrochemical industries.
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