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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]
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 ]
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.
Tungsten ditelluride (W Te 2) is an inorganic semimetallic chemical compound. In October 2014, tungsten ditelluride was discovered to exhibit an extremely large magnetoresistance : 13 million percent resistance increase in a magnetic field of 60 tesla at 0.5 kelvin. [ 3 ]
Tungsten diarsenide is a black solid. It forms crystals in the monoclinic crystal system with the same structure of molybdenum diarsenide. Tungsten diarsenide is insoluble in hydrofluoric acid, hydrochloric acid and alkaline aqueous solutions. It reacts with concentrated nitric acid and sulfuric acid. [1]
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;
Tungsten(IV) iodide is a binary inorganic compound of tungsten metal and iodine with the chemical formula WI 4. [1] [2] [3] ... The compound decomposes when heated in ...
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