Dielectric Constant

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dielectric constant

[‚dī·ə′lek·trik ′kän·stənt]
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 ?
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 constants ([epsilon]') at 20[degrees]C, dielectric breakdown strengths, and thicknesses of the PCN films.
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In engineering parlance, it has too low a value of a property called the dielectric constant, or k.
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This helps explain the interaction of material properties such as dielectric constant and dielectric loss, and design features such as frequency and transmission line length.
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Relative dielectric constants of air and liquids used (20[degrees]C) Medium Relative dielectric constant Air 1.
Nanocomposite dielectric materials include inorganic nanoparticles in a polymer base, which together have high dielectric constants due in part to the inorganic nanoparticles while retaining much of the processability of the base polymer.
The case of without additives and doped PVDF samples, before the relaxation transition belonging to the glass transition temperature a decrease in the real dielectric constants is observed.
As DRAM performance can no longer be advanced solely by reducing feature size, integrated circuit manufacturers are now faced with the challenge of integrating materials with extremely high dielectric constants such as Strontium Titanium Oxide (STO).