The Property And Preparation of Silicon Disulfide SiS2 Powder

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What is the silicon disulfide properties?

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 is silicon disulfide prepared?

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 to 1330degC 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. Heat will decompose hydrocarbon-sulfide-based silica, producing silicon disulfide or sulfide. 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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