Tungsten disulfide is fine crystal or powder with metallic luster, hexagonal crystal structure. Blue-gray hexagonal crystals.
Tungsten disulfide is a compound of tungsten and sulfur, chemical formula WS2, molecular weight 247.97, the state is black gray powder, it appears as tungstenite in nature, and it is dark gray orthorhombic crystalline solid. The relative density is 7.510.
Slightly soluble in cold water, soluble in hot water. Insoluble in hydrochloric acid and alkali (except the mixture of concentrated nitric acid and hydrofluoric acid). Soluble in molten alkali, insoluble in alcohol. The density is 7.6g•cm-3. Reducing, it can react with hot concentrated sulfuric acid, nitric acid, aqua regia and other strong oxidants, and can be converted into WO3 when heated in air or oxygen. When heated to 1250°C in vacuum, it decomposes into tungsten and sulfur. In the dry pure nitrogen flow, heat the mixture of tungsten trisulfide and sulfur to 900°C to sublimate the excess sulfur, and the residue is tungsten disulfide.
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