Dec 16, 2018 · $\begingroup$ For an ideal dielectric, yes you can apply any voltage you want and it will remain an insulator. Of course no real material is an ideal dielectric. Real dielectrics “break down” (become conductors) at high enough voltages. A natural example is air breaking down which causes lightning. $\endgroup$ –

The dielectric constant is a measure of the spring constant. A material with a large dielectric constant is made of "stretchy" atoms or molecules. Given a parallel plate capacitor, the capacitance depends on the distance between the plates. Inserting a dielectric effectively adds plates, reducing the separation.

Jul 30, 2023 · if current density is zero then the electric field intensity in a dielectric will also be zero. This is the part that doesn’t hold. In a conductor we have Ohm’s law: $\vec J =\sigma \vec E$. But dielectrics are not conductors and Ohm’s law …

Jan 9, 2016 · In other words, permittivity is a measure of how an electric field affects, and is affected by, a dielectric medium. Yes, metals have infinite permittivity as they completely negate the electric field inside their bulk. I.e. infinite resistance to …

Jun 10, 2021 · For conductors dielectric constant is infinite as electric field cant exist inside it .And conductors have very low resistance too .So is there any relation btw dielectric constant and resistance of material .

Feb 18, 2016 · Dielectric constant is proportional to the ratio of polarization density (P) and electric field (E) which means dielectric constant is inversely proportional to electric field. The Electric field (E) inside a conductor is always zero under the static situation so the dielectric constant for conductor is infinite.

May 25, 2018 · An amorphous, granular, or otherwise macroporous or matrix material has no reciprocal lattice -- boundary or other effects will dominate the optical properties. Pure dielectric crystals will generally be transparent to photon energies lower than their bandgap. $\endgroup$ –

These, the index of refraction and the inverse dielectric function are therefore the most appropriate quantities to measure. As a further reference, I recommend the book Electrodynamics of Solids by Dressel and Gruner.

May 8, 2022 · I was reading Introduction to Solid State Physics (8th Edition) by Charles Kittel and the static dielectric constant is defined as $$\varepsilon(0) = \varepsilon(\omega=0) $$ and the optical dielectric constant is defined as $$\varepsilon(\infty) = \varepsilon(\omega=\infty).$$ Then the book shows the values for silicon (a semiconductor) where ...

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