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In [[dielectric spectroscopy]], large frequency dependent contributions to the dielectric response, especially at low frequencies, may come from build-ups of charge.
 
This, so-called '''Maxwell–Wagner–Sillars polarization''' (or often just Maxwell-Wagner polarization), occurs either at inner dielectric boundary layers on a mesoscopic scale, or at the external electrode-sample interface on a macroscopic scale. In both cases this leads to a separation of charges (such as through a [[depletion layer]]). The charges are often separated over a considerable distance (relative to the atomic and molecular sizes), and the contribution to dielectric loss can therefore be orders of magnitude larger than the dielectric response due to molecular fluctuations.<ref>Kremer F., & Schönhals A. (eds.): Broadband Dielectric Spectroscopy. – Springer-Verlag, 2003, ISBN 978-3-540-43407-8.</ref>
 
== Occurrences ==
 
Maxwell-Wagner polarization processes should be taken into account during the investigation of inhomogeneous materials like suspensions or coloids, biological materials, phase separated polymers, blends, and crystalline or liquid crystalline polymers.<ref>Kremer F., & Schönhals A. (eds.): Broadband Dielectric Spectroscopy. – Springer-Verlag, 2003, ISBN 978-3-540-43407-8.</ref>
 
== Models ==
 
The simplest model for describing an inhomogeneous structure is a double layer arrangement, where each layer is characterized by its permittivity <math>\epsilon'_1,\epsilon'_2</math> and its conductivity <math>\sigma_1,\sigma_2</math>.  The relaxation time is then:
<math>\tau_{MW}=\epsilon_0\frac{\epsilon_1+\epsilon_2}{\sigma_1+\sigma_2}</math>
Importantly this shows that an inhomogeneous material may have frequency dependent response, even though none of the individual inhomogeneities severally are frequency dependent.{{Citation needed|date=September 2012}}
 
A more sophisticated model for treating interfacial polarization was developed by Maxwell, and later generalized by Wagner <ref>Wagner KW (1914) Arch Elektrotech 2:371; {{doi|10.1007/BF01657322}}</ref> and Sillars.<ref>Sillars RW (1937) [http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5317372 J Inst Elect Eng 80:378]</ref>  Maxwell considered a spherical particle with a dielectric permittivity <math>\epsilon'_2</math> and radius <math>R</math> suspended in an infinite medium characterized by <math>\epsilon_1</math>. Certain European text books will represent the <math>\epsilon_1</math> constant with the Greek letter ω (Omega), sometimes referred to as Doyle's constant.<ref>G.McGuinness, ''Polymer Physics'', Oxford University Press, p211</ref>
 
== References ==
<References/>
 
== See also ==
{{multicol}}
* [[Debye relaxation]]
* [[Dielectric dispersion]]
* [[Dielectric function]]
* [[Dipole]]
* [[Permittivity]]
{{multicol-break}}
* [[Ellipsometry]]
*[[Linear response function]]
*[[Kramers–Kronig relation]]
*[[Green–Kubo relations]]
{{multicol-end}}
 
{{DEFAULTSORT:Maxwell-Wagner-Sillars polarization}}
[[Category:Spectroscopy]]
[[Category:Electric and magnetic fields in matter]]

Revision as of 06:42, 11 March 2013

In dielectric spectroscopy, large frequency dependent contributions to the dielectric response, especially at low frequencies, may come from build-ups of charge.

This, so-called Maxwell–Wagner–Sillars polarization (or often just Maxwell-Wagner polarization), occurs either at inner dielectric boundary layers on a mesoscopic scale, or at the external electrode-sample interface on a macroscopic scale. In both cases this leads to a separation of charges (such as through a depletion layer). The charges are often separated over a considerable distance (relative to the atomic and molecular sizes), and the contribution to dielectric loss can therefore be orders of magnitude larger than the dielectric response due to molecular fluctuations.[1]

Occurrences

Maxwell-Wagner polarization processes should be taken into account during the investigation of inhomogeneous materials like suspensions or coloids, biological materials, phase separated polymers, blends, and crystalline or liquid crystalline polymers.[2]

Models

The simplest model for describing an inhomogeneous structure is a double layer arrangement, where each layer is characterized by its permittivity and its conductivity . The relaxation time is then: Importantly this shows that an inhomogeneous material may have frequency dependent response, even though none of the individual inhomogeneities severally are frequency dependent.Potter or Ceramic Artist Truman Bedell from Rexton, has interests which include ceramics, best property developers in singapore developers in singapore and scrabble. Was especially enthused after visiting Alejandro de Humboldt National Park.

A more sophisticated model for treating interfacial polarization was developed by Maxwell, and later generalized by Wagner [3] and Sillars.[4] Maxwell considered a spherical particle with a dielectric permittivity and radius suspended in an infinite medium characterized by . Certain European text books will represent the constant with the Greek letter ω (Omega), sometimes referred to as Doyle's constant.[5]

References

  1. Kremer F., & Schönhals A. (eds.): Broadband Dielectric Spectroscopy. – Springer-Verlag, 2003, ISBN 978-3-540-43407-8.
  2. Kremer F., & Schönhals A. (eds.): Broadband Dielectric Spectroscopy. – Springer-Verlag, 2003, ISBN 978-3-540-43407-8.
  3. Wagner KW (1914) Arch Elektrotech 2:371; 21 year-old Glazier James Grippo from Edam, enjoys hang gliding, industrial property developers in singapore developers in singapore and camping. Finds the entire world an motivating place we have spent 4 months at Alejandro de Humboldt National Park.
  4. Sillars RW (1937) J Inst Elect Eng 80:378
  5. G.McGuinness, Polymer Physics, Oxford University Press, p211

See also

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