What Materials Cannot Use the Electric Potential Energy Law?

AI Thread Summary
The Electric Potential Energy Law, U=∫D*E, cannot be applied to certain materials due to their non-linear characteristics. Ferroelectric and piezoelectric materials exhibit hysteresis effects, which violate the linear relationship required for the law's derivation. This non-linearity complicates the relationship between electric displacement (D) and electric field (E). Consequently, the law is not applicable to these materials in the same way it is for linear dielectrics. Understanding these limitations is crucial for accurate applications in electrical engineering and material science.
stefano colom
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my professor has explained Electric potential energy Law U=∫D*E above all the space. he said you can not use for some kind of materials. l can 't remember if they are Ferroelectricity or piezoelectric materials. then can you say to me the reason too? thank you
 
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Naty1 said:
I'm guessing he might have been alluding to the hysteresis effect of ferromagentic materials.
more here:http://en.wikipedia.org/wiki/Ferroelectricity
There is a hysteresis effect in ferroelectric materials, too.
 
but why couldn't l use for the ferroelectricity materials
 
The derivation of the D.E form requires that the relation between D and E be linear.
It is not for ferroelectric materials.
 

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