Interface (Maxwell-Wagner) Polarization and Dielectric Loss

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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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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.