Dielectric relaxation

Dielectric relaxation means the adjustment of dielectric displacement (D) or polarization (P) to the time-dependent electrical field (E). Relative permittivity (ɛ) characterizes the capacitance ratio of a condenser filled with an insulating material and with vacuum.

1. What is dielectric relaxation frequency?
2. What is the definition of dielectric?
3. How do you calculate dielectric relaxation time?
4. What is dipole relaxation time?

What is dielectric relaxation frequency?

Dielectric relaxation as a whole is the result of the movement of dipoles (dipole relaxation) and electric charges (ionic relaxation) due to an applied alternating field, and is usually observed in the frequency range 10²-10¹⁰ Hz.

What is the definition of dielectric?

Dielectrics are materials that don't allow current to flow. They are more often called insulators because they are the exact opposite of conductors.

How do you calculate dielectric relaxation time?

If you do some analysis, the charge on the plates of the capacitor decays exponentially with time with a relation Q = Q(0) exp(-t/\rho\epsilon) where \rho and \epsilon are the resistivity and permitivity of the material respectively. The decay time (\rho\epsilon) is called dielectric relaxation time.

What is dipole relaxation time?

Suffice it to say that typical relaxation times are around 10 ^–11 s; this corresponds to frequencies in the GHz range , i.e. "cm -waves".