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Does the orientational polarization contribute to the permittivity of silicon oxide

  1. Oct 20, 2005 #1
    I want to know if the orientational polarization should be included when you calculate the permittivity of the silicon oxide (both crystal and amorphous)?
  2. jcsd
  3. Oct 20, 2005 #2
    I think yes unless you're limiting yourself to a frequency range where it's contribution is small. Don't take this as authorative advice though
  4. Oct 20, 2005 #3

    Claude Bile

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    Permittivity can vary with polarisation. In the optical regime, this is known as birefringence. Amorphous silica does not exhibit significant birefringence, but crystalline silica might, I cannot recall off the top of my head though. This data should be readily available however.


    P.S. Does that answer your question?
  5. Oct 21, 2005 #4
    In most solid there are three kinds of polarization that may contribute to the permittivity,viz Eletronic polarization,orientational polarization and Atomic ploraization.If the solid contains polar molecules,the orientational polarization should be considered. I want to know if the permittivity of silicon oxide (both crystal and amorphous) relates to the orientational polarization.
  6. Oct 21, 2005 #5
    Polar liquids have orientational polarization at frequencies that are not too high.

    That is why water has such a high relative dielectric constant (about 80).
    But the static dielectric constant of ice is only 3.
  7. Oct 24, 2005 #6
    Does it mean that orientational polarization will not affect the permittivity of the other solid?

  8. Oct 24, 2005 #7
    Maybe there are solids with orientational polarization. I cannot imagine how SiO2 could be one of them, but I am do not really know what might happen in amorphous SiO2.

    Soda ime glass has a static dielectric constant of about 7, depending on composition. I think ionic motion is involved there.
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