Dielectric Polarization

dielectric polarization

[‚dī·ə′lek·trik ‚pō·lə·rə′zā·shən]

Polarization, Dielectric


(1) The displacement of positive and negative charges in opposite directions in a dielectric. Polarization occurs through the action of an electric field or other external factors, such as mechanical stress in the case of piezoelectric crystals. Dielectric polarization can also arise spontaneously in pyroelectric crystals, particularly in ferroelectrics.

(2) The dipole moment per unit volume of a dielectric.

References in periodicals archive ?
For example, the dielectric polarization and electric fields are odd under parity transformations and even under time-reversal transformations.
The dependence of contributions of different components of dielectric polarization, such as electric, ionic, and orientational polarization on the frequency of the applied electric field, is responsible for the change in the value of the dielectric constant.
The designs also include selection of an optimum AC frequency, as all fluid and particle AC electro-kinetics involve certain RC times due to either double layer charging or dielectric polarization, and proper electrode geometry to achieve mixing or pumping action.
Unlike rotational or vibrational viscometers for measuring cure, this device uses a stationary sensor built into its baseplate to measure dielectric polarization and temperature of the material.
They then switch focus to nonequilibrium electrokinetic phenomena in chapters discussing field-induced dielectric polarization, field-induced double layer polarization, dielectrophoresis, and electrorotation.
It should also be mentioned that a high value of [epsilon]' may provide good values of dielectric polarization and p(n, but the [FOM.
Nonlinear optics (NLO) is the branch of optics that describes the behavior of light in nonlinear media, that is, media in which the dielectric polarization P responds nonlinearly to the electric field E of the light.
As the temperature becomes higher, the state of polymer matrix may be considered as that similar to liquid, therefore, the mobility of ions and macromolecules toward the external electric field may be lowered because of the intensive thermal motion energy and the interfaces between POE matrix and fillers may also be destroyed because of the relatively low melting point (55[degrees]C in our case) of POE, which may result in the decrease of both dielectric polarization and dielectric loss.
Dielectric polarization measurement gives insight into the foam curing process.
Stratton (Massachusetts Institute of Technology) had a remarkable background in both mathematical physics and electrical engineering, as well as great enthusiasm, and in this facsimile reprint he vigorously explains field equations, including Maxwell's equations, stress and energy, including energy flow and forces in a magnetostatic field, the electrostatic field, including dielectric polarization, the magnetostatic field, including calculations of the field of a current distribution, plane waves in unbounded and isotropic media, cylindrical waves, spherical waves, radiation, and boundary-value problems including the reflection and refraction of a plane surface.
The relationship is based on the difference in dielectric polarization between the two monomer units in the polymer chain.
a] is the magnetic field strength of microwave, W is the total energy stored in the cavity resonator, [Delta]V is the volume of the sample where the microwaves passes, V is the volume of the whole cavity resonator, P is the dielectric polarization of the sample, M is the magnetization and J is the electric current density.