Dielectric Constant


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dielectric constant

[‚dī·ə′lek·trik ′kän·stənt]
(electricity)
For an isotropic medium, the ratio of the capacitance of a capacitor filled with a given dielectric to that of the same capacitor having only a vacuum as dielectric.
More generally, 1 + γχ, where γ is 4π in Gaussian and cgs electrostatic units or 1 in rationalized mks units, and χ is the electric susceptibility tensor. Also known as relative dielectric constant; relative permittivity; specific inductive capacity (SIC).

Dielectric Constant

 

a quantity that characterizes the dielectric properties of a medium—its reaction to an electrical field. In the relation D = ∊E, where E is the field strength and D is the electrical induction in the medium, the dielectric constant is the proportionality factor ∊. For most dielectrics, the dielectric constant in fields that are not very strong is not a function of the field E. In strong fields (comparable to intra-atomic fields), and for certain dielectrics (such as ferroelectric materials) in ordinary fields, the relationship between D and E is nonlinear.

The value of the dielectric constant depends essentially on the type of substance and on the external conditions (temperature, pressure, and so on). In alternating electrical fields the dielectric constant is a function of the frequency of the field E.

References in periodicals archive ?
The dielectric constant describes the electrical properties of the material influencing the propagation of waves in the range 10 MHz to 1,000 MHz (Davis and Annan 1989).
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Temperature dependent dielectric constant has been studied within the temperature range from 40 to 200 degC with fixed frequency of 100 kHz.
Variation of dielectric constant, volume resistivity, and electrical conductivity of the composites with respect to different frequencies and temperatures are reported.
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Dielectric measurements were carried out for all the samples prepared in pallets form to find out the dielectric parameters such as dielectric constant and dielectric loss as function of frequency.