Search results
Results from the WOW.Com Content Network
The dimeric silicon dioxide, (SiO 2) 2 has been obtained by reacting O 2 with matrix isolated dimeric silicon monoxide, (Si 2 O 2). In dimeric silicon dioxide there are two oxygen atoms bridging between the silicon atoms with an Si–O–Si angle of 94° and bond length of 164.6 pm and the terminal Si–O bond length is 150.2 pm.
A compound semiconductor is a semiconductor compound composed of chemical elements of at least two different species. These semiconductors form for example in periodic table groups 13–15 (old groups III–V), for example of elements from the Boron group (old group III, boron, aluminium, gallium, indium) and from group 15 (old group V, nitrogen, phosphorus, arsenic, antimony, bismuth).
It is also used in semiconductor electronics. It is manufactured from silicon dioxide and carbon in an Acheson furnace between 1600 and 2500 °C. There are 250 known crystalline forms with alpha silicon carbide the most common. Silicon itself is an important semiconductor material used in microchips.
Silicon oxynitride is a ceramic material with the chemical formula SiO x N y.While in amorphous forms its composition can continuously vary between SiO 2 and Si 3 N 4 (silicon nitride), the only known intermediate crystalline phase is Si 2 N 2 O. [2] It is found in nature as the rare mineral sinoite in some meteorites and can be synthesized in the laboratory.
Carbothermal reduction of silicon dioxide in a nitrogen atmosphere at 1400–1450 °C has also been examined: [9] 3 SiO 2 + 6 C + 2 N 2 → Si 3 N 4 + 6 CO. The nitridation of silicon powder was developed in the 1950s, following the "rediscovery" of silicon nitride and was the first large-scale method for powder production.
Note that the especially high molar values, as for paraffin, gasoline, water and ammonia, result from calculating specific heats in terms of moles of molecules. If specific heat is expressed per mole of atoms for these substances, none of the constant-volume values exceed, to any large extent, the theoretical Dulong–Petit limit of 25 J⋅mol ...
Silicon dioxide; From a chemical formula: This is a redirect from a chemical/molecular formula to its systematic (technical) or trivial name.
This coordination number can vary from one to four, with the most common being three. The silicon atom always is coordinated by four nitrogen atoms. In the silicates , silicon is surrounded by four oxygen atoms, but each oxygen is only connected to one or two silicon atoms, and only very rarely three.