Chromium/Vanadiam Sublimation or Melting

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    Melting Sublimation
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SUMMARY

Chromium and vanadium, when deposited in ultra-high vacuum (UHV) conditions, primarily undergo melting rather than sublimation. Both metals transition from solid to liquid before vaporization occurs. While sublimation may be observed in specific scenarios, such as metal multilayer formation on a target, it is not the primary phase change for these materials. Understanding these properties is crucial for accurately determining the volume needed for crucible filling during deposition processes.

PREREQUISITES
  • Understanding of phase transitions in materials science
  • Knowledge of ultra-high vacuum (UHV) deposition techniques
  • Familiarity with vapor pressure concepts
  • Basic principles of metallurgy related to melting points
NEXT STEPS
  • Research the melting points of chromium and vanadium for precise crucible volume calculations
  • Study the effects of vapor pressure on metal deposition in UHV environments
  • Explore techniques for monitoring phase changes during metal deposition
  • Investigate the formation of metal multilayers and their implications in UHV processes
USEFUL FOR

Materials scientists, vacuum deposition engineers, and researchers involved in metal deposition processes in ultra-high vacuum environments.

citw
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I have a pretty stupid question that I hope someone can answer. I'm trying to deposit chromium and vanadium in UHV, and I need to determine whether each of the materials will "melt" or "sublimate" so that I know the volume to fill my crucible. My impression is that these materials will generally not sublimate, but change from solid to liquid to vapor. Is this correct? If I'm not providing enough information please let me know.
 
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Yes, the metals will melt before boiling. You may see sublimation (e.g. metal multilayer formation on your target) before you reach the melting point, because the vapour pressure will rise dramatically as the mp is approached.
 
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