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What are the properties of silicon disulfide (SiO2)?Silicon disulfide The crystal structure of silicon disulfide is an orthorhombic, tetragonal white fibrous system. The molecular form of silicon disulfide (SiS2) is SiS2. Under normal temperature and pressure it is stable, but when exposed to moisture or heated, it will decompose into H2S and siO2.
Inorganic silicon disulfide has the chemical formula SiS2. It is a material that is similar to silica but with a one-dimensional polymer structure.
What are the preparations of silicon disulfide (SiSulfide)?1. Burn aluminum powder in a furnace with extra sulfur. The aluminum sulfide mixture is crushed, and a little excess silica powder added. Place the mixture in a crockpot. Next, place the crockpot inside a quartz tube. Finally, heat the tube with a small amount dry nitrogen. The reaction begins around 1100degC. At 1200-1300degC sublimed SiS2 sticks to the area of low temperature in the tube. Sublimation under nitrogen or vacuum is recommended for purification. The mixture is heated between 5x103MPa (700degC) and silicon to get tetragonal SiS2.
2. Heating is required to decompose hydrocarbon-sulfide based silicon. At 250-300degC, silicon disulfide or sulfide will be produced. Sulfur will cause the decomposition to occur at a much lower temperature if added. Mix 96g of Sulfur and 39g Si (SC2H5)4 in a bowl and heat it at 200degC (10min) to create silicon disulfide. After the latter is dispersed in benzene and filtered, conditions are set up to prevent moisture from mixing.
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