What Are the Chemical Properties of Tungsten Diiodide(II)?

Tungsten diiodide (chemical formula: WI₂) is a kind of inorganic compound formed by the reaction of tungsten and iodine, which has the following chemical properties.

Stability

Tungsten diiodide has good stability at room temperature. Still, it will decompose into tungsten and iodine at high temperature Tungsten is a transition metal element with high melting point, boiling point, high density, and high quality. As an essential component of cemented carbide, tungsten is widely used in the military industry, machinery, and chemical industry Iodine is one of the essential trace elements needed by the human body. Lack of excessive intake of iodine will lead to various diseases. It is called the "intellectual element" Compared with tungsten, iodine is chemically active but most stable compared with its halogen group (chlorofluoride, bromide, and iodine) Therefore, iodine is the first halogen element found to be suitable for circulating gas of tungsten filament bulb.

Flammability

Tungsten diiodide has certain flammability, which is related to its application in the lighting field Tungsten diiodide is an intermediate substance formed in an iodine tungsten lamp to ensure the circulation of tungsten halogen. This kind of lamp belongs to a thermal light source with a high degree, which may lead to the combustion of combustibles near the use site There are two main factors affecting its flammability: power and voltage It can be seen from the experiment that the heat emitted by iodine tungsten lamp gradually increases and accumulates with time after lighting, and the surface temperature of iodine tungsten lamp will gradually increase, which accords with the exponential growth law After the lamp works for a period of time, the heat exchange between the lamp and the outside gradually reaches balance, and the surface temperature of the lamp also reaches basic stability With the increase of iodine tungsten lamp power or voltage, the surface temperature also increases.

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