Helium & Hydrogen Escape Rates: Table & Physical Mechanism

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SUMMARY

This discussion centers on the escape rates of Helium and Hydrogen through various materials, emphasizing the importance of gas permeability charts. Key resources include Greenhouse's "Hermeticity of Electronic Packages," which provides valuable insights into gas permeation mechanisms. The physical mechanism involves gas atoms entering solids, occupying interstitial sites, and diffusing through grain boundaries before exiting the material. Understanding these processes is crucial for applications in material science and engineering.

PREREQUISITES
  • Gas permeability concepts
  • Diffusion mechanisms in solids
  • Material science fundamentals
  • Familiarity with Greenhouse's Hermeticity of Electronic Packages
NEXT STEPS
  • Research gas permeability charts for Helium and Hydrogen
  • Study diffusion mechanisms in crystalline materials
  • Explore the role of interstitial sites in gas diffusion
  • Investigate the impact of grain boundaries on gas escape rates
USEFUL FOR

Material scientists, engineers, and researchers focused on gas permeability and diffusion in solids will benefit from this discussion.

wasia
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Where could one find a table of Helium and/or Hydrogen escape rates through various materials? What is the Physical mechanism: is it tunneling only or other things contribute as well?

Thanks!
 
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You are looking for gas permeability charts and tables, some of which can be found through Google and Google Books (and your local university library). Are you looking for any materials in particular?

I don't have the book handy, but Greenhouse's Hermeticity of Electronic Packages has a lot of useful information.

The mechanism is that a gas atom enters the solid (in crystals, it might occupy an interstitial site or travel down grain boundaries) and randomly moves around. Gas permeation involves many, many gas atoms that diffused through and exited the other side of the material.
 

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