Dielectric relaxation time allows us to investigate any system deeply. I am looking for the relation and difference between them. Since both are playing a different key role in ion dynamics. SO, both will strongly affect the investigated system.
Dielectric relaxation is a phenomenon where a system of dipoles or materials having heterogeneous charge distribution when placed under the externally applied electric field (ac) tries to follow the polarity of the field. However, with increasing frequency of the applied field, they are unable to follow it. Thus the applied input and system response are no longer in phase and energy dissipation occurs. This is what has been explained in terms of relaxation times of the orientation or dielectric relaxation.
It is known that the resulting electric field in the dielectric is always less than the external field. Molecules can have a different position (symmetry of their coordination) in the structure of the dielectric and subjected to various influence from their neighbors (environment). Therefore, in the body there is a potential relief, describing the distribution of local fields in a dielectric medium. The average field in the dielectric represents the volume average as the result of the superposition of the external field and electric field of molecular dipoles of the dielectric. This field is called the average macroscopic (or average) field of the dielectric.
Relaxation is the process of establishing thermodynamic and statistical equilibrium in a physical system, consisting of a large number of particles. The dielectric relaxation time describes the recovery of the equilibrium polarization in the dielectric after the external field shutoff. Relaxation is a multistep process, because the various physical parameters of the system (particle distribution in lattice and momenta, temperature, pressure, concentration in small volumes and throughout the system, and others) tend towards equilibrium with the different velocity. Thus, the dielectric relaxation can be caused by different mechanisms and flows in different ways depending on the localization volume of the dielectric. Therefore, the relaxation times for different mechanisms and/or types of molecules may be different. The volume average relaxation time and relaxation time relating to particular molecules in the structure will be different also.
http://mmse.xyz/en/i-materials-science-vol-10/dielectric-loss-behavior-of-srxzn1-xmntio5-x-0-1-to-0-9-ceramics/
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