Orientational Polarization & Silicon Oxide Permittivity

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SUMMARY

The discussion centers on the role of orientational polarization in calculating the permittivity of silicon oxide, both in its crystalline and amorphous forms. It is established that orientational polarization should be included unless the frequency range limits its contribution. The conversation highlights the three types of polarization affecting permittivity: electronic, orientational, and atomic. Additionally, it notes that while amorphous silica does not exhibit significant birefringence, crystalline silica may, and provides examples of dielectric constants in polar liquids and solids.

PREREQUISITES
  • Understanding of permittivity and its components: electronic, orientational, and atomic polarization.
  • Familiarity with dielectric constants in materials, particularly silicon oxide.
  • Knowledge of birefringence and its implications in optical materials.
  • Basic concepts of frequency dependence in polarization effects.
NEXT STEPS
  • Research the impact of orientational polarization on the permittivity of silicon oxide.
  • Study the birefringence properties of crystalline silica compared to amorphous silica.
  • Investigate the dielectric constants of various polar liquids and solids, focusing on their polarization contributions.
  • Explore the relationship between ionic motion and dielectric constants in materials like soda lime glass.
USEFUL FOR

Materials scientists, physicists, and engineers involved in the study of dielectric materials, particularly those working with silicon oxide and its applications in electronics and optics.

hjq_seu
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I want to know if the orientational polarization should be included when you calculate the permittivity of the silicon oxide (both crystal and amorphous)?
 
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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
 
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.

Claude.

P.S. Does that answer your question?
 
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.
 
hjq_seu said:
In most solid there are three kinds of polarization that may contribute to the permittivity,viz Eletronic polarization,orientational polarization and Atomic ploraization.
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.
 
Does it mean that orientational polarization will not affect the permittivity of the other solid?

Pieter Kuiper said:
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.
 
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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