What are the chemical reaction happen indise lamp in tungsten

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Discussion Overview

The discussion centers around the chemical reactions occurring in incandescent lamps, particularly in relation to tungsten filaments and the addition of iodine. Participants explore the nature of these reactions and their implications for lamp performance and longevity.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification

Main Points Raised

  • Some participants clarify that incandescent lamps with tungsten filaments do not undergo chemical reactions to produce light; instead, the filament heats up until it glows.
  • Others suggest that the addition of iodine in halogen lamps leads to reactions with tungsten at the cooler quartz surface, forming tungsten iodide, which then vaporizes and returns to the filament, where it decomposes back into tungsten and iodine.
  • A participant mentions the Van Arkel - de Boer method, possibly as a related concept or technique.
  • One participant expresses gratitude for clarification regarding the role of iodine in incandescent lamps.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the nature of the reactions in incandescent lamps, with some focusing on the absence of reactions in standard incandescent designs while others discuss the chemical processes in halogen lamps.

Contextual Notes

The discussion includes assumptions about the types of lamps being referenced and the specific conditions under which reactions may occur. There is also a mention of the potential relevance of the chemistry forum for further exploration of the topic.

Who May Find This Useful

Individuals interested in the chemistry of lighting technologies, particularly those studying or working with incandescent and halogen lamps, may find this discussion relevant.

kimdesug
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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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