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Dielectric Constant Vs Temperature Vs Polarity

  1. Apr 29, 2017 #1
    please explain the concept of dielectric constant in the simplest CHEMICAL terms possible.
    why does it decrease when the temperature increases? and why does it increase when the polarity increases?
    please keep it simple and brief.
     
  2. jcsd
  3. Apr 29, 2017 #2
    In the simplest way possible I can think of:
    Temperature increases --> thermal expansion --> lattice constant increases --> stiffer (or stretched chemical bonds) --> faster vibrational frequency (ω) --> less dielectric constant, ε ( where ε is proportional to 1/ω2). Recall that slow vibration means more efficient screening and hence larger ε.

    Along the same lines, polar materials tend to have slow lattice vibration modes which are very efficient in screening.
     
  4. Apr 29, 2017 #3
    See here : https://www.physicsforums.com/threads/dielectric-constant-vs-temperature-vs-polarity.912999/ [Broken] .

    You should not duplicate questions.
     
    Last edited by a moderator: May 8, 2017
  5. Apr 30, 2017 #4

    jim mcnamara

    User Avatar

    Staff: Mentor

    Threads merged. Duplicate removed.
     
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