Tungsten has the highest melting point of all the metallic elements and because of this has its first significant commercial application as the filament in incandescent light bulbs and fluorescent light bulbs. Tungsten is available as metal and compounds with purities from 99% to 99.999% (ACS grade to ultra-high purity); metals in the form of foil, sputtering target, and rod, and compounds as submicron and nanopowder. Later it was used in the first television tubes. The first imaging equipment involved X-ray bombardment of a tungsten target. Tungsten expands at nearly the same rate as borosilicate glass? and is used to make metal to glass seals. It is the primary metal in heating elements for electric furnaces and in any components where high pressure/temperature environments are expected, such as aerospace and engine systems. Tungsten is alloyed in steel to improve its ability to operate in high temperatures. Tungsten carbide? is used in drill bits and cutting tools because it is one of the hardest commercial materials.. Tungsten forms compounds with calcium? and magnesium? that have phosphorescent properties and are used in the glass coatings for fluorescent light bulbs. Other tungsten chemical compounds are used in catalysts and lubricants. In reference to its density, Tungsten gets its name from the swedish words tung and sten meaning heavy stone.

Oxides are available in forms including powders and dense pellets for such uses as optical coating and thin film applications. Oxides tend to be insoluble. Fluorides are another insoluble form for uses in which oxygen is undesirable such as metallurgy, chemical and physical vapor deposition? and in some optical coatings. Tungsten is available in soluble forms including chlorides, nitrates and acetates. These compounds are also manufactured as solutions at specified stoichiometries.

Tungsten is a Block D, Group 6, Period 6 element. The number of electrons in each of Tungsten's shells is 2, 8, 18, 32, 12, 2 and its electronic configuration is [Xe] 4f14 5d4 6s2. In its elemental form tungsten's CAS number is 7440-33-7. The tungsten atom has a radius of 137.pm and it's Van der Waals radius? is 200.pm.

All elemental metals, compounds and solutions may be synthesized in ultra high purity (e.g. 99.999%) for laboratory standards, advanced electronic, metallurgy and optical materials and other high technology advantages. Information is provided for stable (non-radioactive) isotopes. Organo-Metallic Tungsten compounds are soluble in organic or non-aqueous solvents.

Tungsten was first discovered by Fausto andJuan Jose de Elhuyar? in 1783. American Elements (external link)

Page last modified on Saturday 31 of December, 2011 06:29:03 MST

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