sublimed cotton-like fibrous clumps with 99.9% purity; white, fibrous mass or needles; rhomb, a=0.560 nm, b=0.553 nm, c=0.975 nm; decomposes in moist air to evolve H2S; burns if ignited by a flame [MER06] [CIC73] [CER91]
Chemical Properties
silicon disulfide, SiS2, white crystals, formed by heating amorphous silicon and sulfur, and then subliming, reactive with water.
Properties
Silicon disulfide is an inorganic compound with the chemical formula SiS2. It belongs to the orthorhombic or tetragonal system. It is stable at room temperature and pressure and decomposes into SiO2 and H2S when exposed to moisture.
Powder preparation
Under the protection of nitrogen atmosphere, lithium sulfide and silicon tetrachloride are evenly mixed in a molar ratio of 2:1, transferred to a reactor and sealed. Heat to 140℃ at a heating rate of 2℃/min and keep warm for 5h. After the reaction is completed, it is cooled to room temperature and the excess silicon tetrachloride is recovered by distillation at 100℃. The solid product in the reactor is added to benzene, and a benzene solution containing silicon sulfide is obtained by solid-liquid separation. Benzene is recovered by distillation at 120℃, and the solid is dried at 100℃ to obtain silicon disulfide powder.
Production method
Put aluminum powder and excess sulfur into a crucible and burn them to obtain aluminum sulfide. Crush the aluminum sulfide and mix it with a slightly excess of silica sand. Put the mixture into a tile tray, and then put the tile tray into a quartz tube, while heating the quartz tube while passing a small amount of dry nitrogen. The reaction starts at 1100℃, and at 1200-1300℃, the sublimated SiS2 adheres to the low temperature area of the tube. During purification, sublime again in nitrogen or vacuum. Heating the mixture of silicon and sulfur at 5×103MPa and 700Chemicalbook℃ can produce tetragonal SiS2.
Heat and decompose hydrocarbon sulfide silicon to generate silicon disulfide and sulfide at 250-300℃. If sulfur is added, it will decompose at a lower temperature. Mix 96g sulfur and 39g Si(SC2H5)4 together and heat at 200℃ for 10min to generate silicon disulfide and ethylsulfane (C2H5-S2-C2H5, C2H5-S3-C2H5). The latter is dissolved in benzene and filtered under conditions to prevent the incorporation of moisture.
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