complex permittivity

complex permittivity

[′käm‚pleks ‚pər·mə′tiv·əd·ē]
(electricity)
A property of a dielectric, equal to ε0(C/C0), where C is the complex capacitance of a capacitor in which the dielectric is the insulating material when the capacitor is connected to a sinusoidal voltage source, and C0 is the vacuum capacitance of the capacitor.
Mentioned in ?
References in periodicals archive ?
complex permittivity, and [epsilon]' = dielectric permittivity.
The complex capacitance (C in Farads) is composed of a real capacitance (C in Farads) and an imaginary capacitance or dissipation (Din Farads) and related to the real and imaginary components of the complex permittivity ([[epsilon].
Figure 5a and b shows the real and imaginary pans of relative complex permittivity measured at 303 K (Fig.
ASTM Standard D 5568-95, Standard test method for measuring relative complex permittivity and magnetic permeability for solid materials at microwave frequencies, in Annual Book of ASTM Standards, Vol.
Therefore, the complex permittivity parameters of real ([epsilon]') and imaginary ([epsilon]") parts of the PCN thin films were studied.
The complex permittivity was converted to the complex dielectric modulus M*(f) according to an equation described in the literature (30).
Dielectric characteristics involving the frequency dependence of the real part (dielectric constant,[epsilon]') and imaginary part of the complex permittivity (dielectric loss, [epsilon]") in the frequency range of 1 MHz-3 GHz were determined with an Radio Frequency (RF) Impedance Analyzer (Agilent E4991A, USA) using capacitive method (on a dielectric material test fixture which comes furnished with the device).
Figure 8 presents the dependence of real and imaginary parts of complex permittivity on frequency, for samples PI-0, PI-10, PI-20, and PI-30, at three chosen temperatures, in the second scan of measurements.
The increase of the real part of complex permittivity can thus chiefly be attributed to dielectric relaxation and the space charge polarization effect, whereas the increase of the imaginary part of complex permittivity can be assigned to the improved electrical conductivity of the composites.
For a two-phase, concentrated suspension system with spherical particles dispersed in a continuous medium, the complex permittivity can be expressed using the Bruggeman-Hanai equation (14):
Lee investigated the complex permittivity spectra and conductivity of graphite nanosheet/epoxy composites at the microwave range (41).