Articles you may be interested inLow dielectric loss, dielectric response, and conduction behavior in Na-doped Y2/3Cu3Ti4O12 ceramics J. Appl. Phys. 116, 044101 (2014); 10.1063/1.4891240 Grain size effect on the giant dielectric constant of CaCu3Ti4O12 nanoceramics prepared by mechanosynthesis and spark plasma sintering The sintering temperature effects on the electrical and dielectric properties of Li 0.05 Ti 0.02 Ni 0.93 O ceramics prepared by a direct thermal decomposition methodThe effect of sintering process on the electrical properties of CaCu 3 Ti 4 O 12 ͑CCTO͒ ceramic dielectrics were investigated in this paper. It was found that grain size is affected by sintering and the nonlinear current-voltage ͑I-V͒ property will decrease with the increased sintering time. Also, the frequency and temperature dependences of dielectric permittivity and loss in the ranges of 10 −1 -10 7 Hz and 130-270 K were studied. Two relaxation processes with activation energy of 0.51 eV and 0.10 eV, respectively, were found in the frequency dependence of tan ␦ and Cole-Cole planes, which can be interpreted in terms of insulating grain boundaries and semiconducting grains. It was suggested that grain boundary Maxwell-Wagner relaxation and ionization of oxygen vacancy V O ++ , proposed as extrinsic and intrinsic relaxations, are responsible for the dielectric behaviors of CCTO ceramics.
The dynamic mechanism of breakdown in polypropylene (PP) were represented based on the discharge-avalanche theory. PP is a typical semi-crystalline thermoplastic polymer with low loss and high thermal stability, which had broad application prospects in recyclable and environment-friendly insulation. Dielectric strength was one of the important properties for polymer insulation, hence research of breakdown mechanism was of great significance for insulation reliability increase and advanced materials development. In this paper, the dielectric strength of PP was enhanced by nano-silica filling, and mechanism of enhancement was discussed based on the change of activation energy measured by thermally stimulated depolarization currents (TSDC).
Polar groups are likely to produce deep traps for electrical charges Thick nanocomposite layer Interposition of a ≈30µm thick nano-composite made of BaTiO3 or TiO2 NPs and LDPE matrix by hot pressing Charge stabilization owing to the high permittivity / high polarizability of NPs Thin nanocomposite layer Thin organosilicon dielectric layer deposition by plasma process incorporating a plane of Ag-NPs at controlled distance from the surface Silver NPs owing to their ability to store positive or negative charges would act as deep traps for electrical charges
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