Crystalline bulk silicon is rather inert


Crystalline bulk silicon is relatively inert but becomes more reactive at high temperatures.  Still, the formation of the vitreous dioxide rapidly increases between 950 °C and 1160 °C, and when 1400 °C is reached, atmospheric nitrogen also reacts to give the nitrides SiN and Si3N4. Silicon reacts with gaseous sulfur at 600 °C and gaseous phosphorus at 1000 °C. This oxide layer nevertheless does not prevent reaction with the halogens; fluorine attacks silicon vigorously at room temperature, but is oxidized and complexed by hydrofluoric acid mixtures containing either chlorine or nitric acid to form hexafluorosilicates. It readily dissolves in hot aqueous alkali to form silicates. At high temperatures, Silicon also reacts with alkyl halides; copper may catalyze this reaction to directly synthesize organosilicon chlorides as precursors to silicone polymers. Upon melting, Silicon becomes highly reactive, alloying with most metals to form silicides and reducing most metal oxides because the heat of the formation of silicon dioxide is so large. Molten Silicon reacts virtually with every known kind of crucible material (except its oxide, SiO2).: 13 This happens due to Silicon's high binding forces for the light elements and its high dissolving power for most parts. As a result, containers for liquid Silicon must be made of refractory, unreactive materials such as zirconium dioxide or group 4, 5, and 6 borides. If you are looking for high quality, high purity and cost-effective Silicon powder, or if you require the latest price of Silicon powder, please feel free to email contact mis-asia.

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