Nanodielectrics, typically defi ned as polymer composites with nanosized ceramic fi llers, have demonstrated significant improvements in electrical endurance, breakdown strength and dielectric constant relative to their constituent materials, which leads to enhanced energy storage capabilities. The key role played by the large interfacial area surrounding nanofi llers proves to be essential to ...

3D printing is used extensively in product prototyping and continues to emerge as a viable option for the direct manufacture of final parts. It is known that dielectric materials with relatively high real permittivity-which are required in important technology sectors such as electronics and communications-may be 3D printed using a variety of techniques. Among these, the fused deposition of pol...

Relaxor-like dielectric behavior, analogous to that found in lead magnesium niobate, has been induced in the polar dielectric barium magnesium niobate ~BMN!. In BMN, the dielectric constant was increased and the temperature of the maximum dielectric constant was shifted to a lower temperature with a decrease in measurement frequency with increasing A-site vacancy concentrations. The frequency d...

Dielectric relaxation (DR) has shown to be a very useful technique to study dielectric materials like polymers and other glass formers, giving valuable information about the molecular dynamics of the system at different length and time scales. However, the standard DR techniques have a fundamental limitation: they have no spatial resolution. This is of course not a problem when homogeneous and ...

In this research, a theory has been developed to estimate the effective parameters of artificial material composed of dielectric bars placed in a periodic fashion in dielectric host medium (air) from equivalent circuit point of view and verified with HFSS simulation. The theory provides a relationship between effective permittivity and the filling factor of the constituent particle and explains...

Tunneling of microwaves through a smooth barrier in a transmission line is considered. In contrast to standard wave barriers, we study the case where the dielectric permittivity is positive, and the barrier is caused by the inhomogeneous dielectric profile. It is found that reflectionless, superluminal tunneling can take place for waves with a finite spectral width. The consequences of these fi...

This work describes and evaluates a technique for determining the dielectric properties of carbon-black filled Ethylene Vinyl Acetate (EVA) rubber and presents results on the studies of the effect of frequency on the permittivity and microwave conductivity using resonant cavity perturbation method. The measurements are performed with the aid of a Network Analyzer in X-band. The simplicity of th...

There is no complete theory of dielectric relaxation for liquid crystals, in particular, or for anisotropic polar dielectrics, in general. Here we develop a relation between the complex frequency-dependent permittivity tensor and the autocorrelation matrix for the net permanent dipole moment of an ellipsoidal cavity within the dielectric. The relevant equations are derived for both non-polariza...

Casimir energy of a dilute homogeneous dielectric ball at zero temperature is calculated for arbitrary physically possible frequency dispersion of dielectric permittivity ε(iω). There are no divergences in calculations because in the realistic model of dilute ball atoms interact at distances greater than average interatomic distance λ, so λ is a natural physical cut-off. It is proved that Casim...

A dielectric measurement for the aqueous solutions at lower frequencies (20Hz to 2MHz) has been carried out in frequency domain using Agilient Precision LCR meter (E4980A). The dielectric permittivity spectra of over entire concentrations with aqueous solutions are measured at 25 ̊C. From observed spectra, static dielectric constants (ε0) have been determined. Dielectric Spectroscopy is especial...