Orientational Polarization & Silicon Oxide Permittivity

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Discussion Overview

The discussion centers on whether orientational polarization should be included in the calculation of the permittivity of silicon oxide, considering both its crystalline and amorphous forms. The scope includes theoretical aspects of polarization and its impact on permittivity, with references to specific materials and conditions.

Discussion Character

  • Technical explanation
  • Debate/contested

Main Points Raised

  • Some participants propose that orientational polarization should be included in permittivity calculations unless limited to a frequency range where its contribution is negligible.
  • One participant notes that permittivity can vary with polarization, mentioning birefringence in crystalline silica but not in amorphous silica.
  • Another participant discusses the three types of polarization that may contribute to permittivity: electronic, orientational, and atomic, emphasizing the relevance of orientational polarization in solids with polar molecules.
  • There is a question about whether orientational polarization affects the permittivity of other solids, with references to the high dielectric constant of water and the low static dielectric constant of ice.
  • A participant expresses uncertainty about the presence of orientational polarization in SiO2, particularly in its amorphous form, while mentioning the dielectric constant of soda lime glass and the potential role of ionic motion.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the role of orientational polarization in silicon oxide's permittivity, with multiple competing views and uncertainties expressed regarding its significance in different forms of silicon oxide.

Contextual Notes

Some statements rely on specific frequency ranges and conditions, and there are unresolved questions about the behavior of amorphous silicon oxide compared to crystalline forms.

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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