What are the chemical reaction happen indise lamp in tungsten

AI Thread Summary
In incandescent lamps with tungsten filaments, the metal heats up to produce light without undergoing chemical reactions. However, in halogen lamps, iodine is added to the gas surrounding the filament, which reacts with tungsten at cooler quartz surfaces to form tungsten iodide. This tungsten iodide vaporizes and returns to the filament, where it decomposes back into tungsten and iodine, enhancing the lamp's longevity and allowing for higher operating temperatures. The discussion also touches on the Van Arkel-de Boer method as a related topic. Understanding these processes is crucial for grasping how halogen lamps function compared to traditional incandescent bulbs.
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Also the chemical involve in the W and iodine. Thx
 
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Welcome to PF.
Your question is unclear.
Do you mean an incandescent lamp with a tungsten filament?
There are no chemical reactions to make the filament glow - the metal heats up until it glows. Reactions with air will reduce the lifetime of the bulb so we want to avoid them.

Don't know what you mean by "in the W and iodine".
 
I suppose he refers to halogen lamps. There some halogen like iodine is added to the gas surrounding the filament. It reacts with the tungsten at the cooler quartz surface (which still has some hundred degrees centigrade) to form tungsten iodide which vaporizes and diffuses back to the filament where it decomposes again into tungsten and elementary iodide. This helps to prolong the livetime of the lamp and use them at higher filament temperatures.

PS: Maybe more adequate to be discussed in the chemistry forum
 
sorry for unclear question, I want to know what happen in the incandescent lamp which add 0.1 mg of iodine. Thx for DrDu, I can picture something.
 
You may also look for: Van Arkel - de Boer method
 
thank!
 

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