Interface (Maxwell-Wagner) Polarization and Dielectric Loss

In summary, Maxwell-Wagner polarization is when interfaces, such as grain boundaries, experience polarization due to an applied electric field. According to the Wikipedia article, the separation of charges over a significant distance can greatly contribute to dielectric loss. However, the exact reason for this relationship is not clear as the cited source is inaccessible.
  • #1
citw
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Maxwell-Wagner polarization is generally described in literature as the polarization of interfaces, such as grain boundaries, with an applied electric field. In the Wikipedia article (http://en.wikipedia.org/wiki/Maxwell–Wagner–Sillars_polarization), it's mentioned that "the charges are often separated over a considerable distance and the contribution to dielectric loss can therefore be orders of magnitude larger...".

I'm still trying to understand the origin of dielectric loss, so can someone please explain why "larger" charge separation leads to more substantial loss?
 
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  • #2
Well, Wikipedia ... Did you check the articles cited?
 
  • #3
DrDu said:
Well, Wikipedia ... Did you check the articles cited?

Unfortunately, the specific citation for this point is a textbook that I do not have access to.
 

1. What is interface (Maxwell-Wagner) polarization?

Interface (Maxwell-Wagner) polarization is a type of polarization that occurs at the interface between two different materials, typically a solid and a liquid or a solid and a gas. It is caused by the accumulation of charges at the interface due to differences in electrical properties between the two materials.

2. How does interface (Maxwell-Wagner) polarization impact dielectric loss?

Interface (Maxwell-Wagner) polarization can significantly contribute to dielectric loss in a material. As charges accumulate at the interface, they create internal electric fields that can cause energy to be dissipated as heat. This results in a loss of energy and an increase in dielectric loss.

3. What factors influence the strength of interface (Maxwell-Wagner) polarization?

The strength of interface (Maxwell-Wagner) polarization is influenced by several factors, including the type of materials at the interface, the surface area of the interface, and the frequency and intensity of the applied electric field. Higher surface area and higher electric field strength can lead to stronger interface polarization.

4. How does temperature affect interface (Maxwell-Wagner) polarization?

Temperature can have a significant impact on interface (Maxwell-Wagner) polarization. As temperature increases, the mobility of ions and molecules at the interface also increases. This can lead to a higher degree of polarization and an increase in dielectric loss.

5. Can interface (Maxwell-Wagner) polarization be controlled or minimized?

Yes, interface (Maxwell-Wagner) polarization can be controlled or minimized through various methods, such as selecting materials with similar electrical properties, reducing the surface area at the interface, and applying a lower intensity electric field. These measures can help reduce the accumulation of charges at the interface and decrease dielectric loss.

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