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Tungsten borides are compounds of tungsten and boron. Their most remarkable property is high hardness. Their most remarkable property is high hardness. The Vickers hardness of WB or WB 2 crystals is ~20 GPa [ 1 ] [ 2 ] and that of WB 4 is ~30 GPa for loads exceeding 3 N. [ 3 ]
The discovery of superhard tungsten tetraboride is further evidence for the promising design approach of covalently bonding incompressible transition metals with boron. While WB 4 was first synthesized and identified as the highest boride of tungsten in 1966, [52] it was only recognized as an inexpensive superhard material in 2011. [53]
Because tungsten is a rare metal [134] and its compounds are generally inert, the effects of tungsten on the environment are limited. [135] The abundance of tungsten in the Earth's crust is thought to be about 1.5 parts per million.
Enzyme kinetics: Why do some enzymes exhibit faster-than-diffusion kinetics? [13]Protein folding problem: Is it possible to predict the secondary, tertiary and quaternary structure of a polypeptide sequence based solely on the sequence and environmental information?
Pages in category "Tungsten compounds" The following 14 pages are in this category, out of 14 total. This list may not reflect recent changes. C. Cemented carbide;
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Scheelite is a calcium tungstate mineral with the chemical formula Ca W O 4.It is an important ore of tungsten (wolfram). Scheelite is originally named after Swedish chemist Carl Wilhelm Scheele (1742–1786).
Sodium tungstate is the inorganic compound with the formula Na 2 WO 4. This white, water-soluble solid is the sodium salt of tungstic acid. It is useful as a source of tungsten for chemical synthesis. It is an intermediate in the conversion of tungsten ores to the metal. [1]