Topic
Dielectric loss
About: Dielectric loss is a research topic. Over the lifetime, 20296 publications have been published within this topic receiving 349254 citations.
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TL;DR: A review of the current state of understanding of dielectric mixture properties, and approaches to use numerical calculations for their modeling are presented in this article, where it is shown that interfacial polarization can yield different non-Debye dielectrics responses depending on the properties of the constituents, their concentrations and geometrical arrangements.
Abstract: A review of the current state of understanding of dielectric mixture properties, and approaches to use numerical calculations for their modeling are presented. It is shown that interfacial polarization can yield different non-Debye dielectric responses depending on the properties of the constituents, their concentrations and geometrical arrangements. Future challenges on the subject are also discussed.
259 citations
TL;DR: In this paper, the authors report on new measurements made over the frequency range from 2 to 100 GHz by a resonator method (2-10 GHz) and a radiometer method (10-100 GHz).
Abstract: So far, knowledge about the dielectric properties, especially the loss factor, of ice at microwave frequencies has been unsatisfactory. In this work the authors report on new measurements made over the frequency range from 2 to 100 GHz by a resonator method (2-10 GHz) and a radiometer method (10-100 GHz). Measurements were made with pure and with slightly saline (10 to 13 p.p.m.) ice. The results agree with the assumption of a single minimum of the dielectric loss at 2 to 4 GHz. For pure ice the data are a natural link between the measurements of Westphal made below 1 GHz and the far-infrared spectrum. The influence of small impurities on the dielectric loss is compared with the behaviour of sea ice, and it is found that the same linear relationship with salinity can be applied to both cases.
257 citations
TL;DR: In this article, the dielectric properties of in-situ formed silver (Ag) incorporated carbon black (CB)/polymer composites were studied and the Coulomb blockade effect of the contained Ag nanoparticles, the well-known quantum effect of metal nanoparticles was found to have significant influences on the dielection properties of the nanocomposite system.
Abstract: Dielectric properties of in-situ formed silver (Ag) incorporated carbon black (CB)/polymer composites were studied. In-situ formed Ag nanoparticles in the Ag/CB/epoxy composites increased the dielectric constant (K) value and decreased the dissipation factor (Df). The remarkably increased dielectric constant of the nanocomposite is due to the piling of charges at the extended interface of the interfacial polarization-based composites. The reduced dielectric loss might be due to the Coulomb blockade effect of the contained Ag nanoparticles, the well-known quantum effect of metal nanoparticles. The size, size distribution and loading level of metal nanoparticles in the nanocomposite were found to have significant influences on the dielectric properties of the nanocomposite system.
257 citations
TL;DR: In this paper, the microstructural and electrical properties of Mg-doped Ba06Sr04TiO3 thin films prepared by the metalorganic solution deposition technique using carboxylate-alkoxide precursors at a postdeposition annealing temperature of 750
Abstract: We report on the microstructural and electrical properties of Mg-doped Ba06Sr04TiO3 thin films prepared by the metalorganic solution deposition technique using carboxylate-alkoxide precursors at a postdeposition annealing temperature of 750 °C The structure and morphology of the films were analyzed by x-ray diffraction and atomic force microscopy studies The electrical measurements were conducted on metal-ferroelectric-metal capacitors using Pt as the top and bottom electrode The typical measured small signal dielectric constant and dissipation factor of undoped Ba06Sr04TiO3 thin films at a frequency of 100 kHz were 450 and 0013, respectively The undoped Ba06Sr04TiO3 thin films exhibited a high tunability of 281% and resistivity of 04×1012 Ω cm at an applied electric field of 200 kV/cm The Mg-doped Ba06Sr04TiO3 thin films exhibited significantly improved dielectric loss and insulating characteristics compared to undoped Ba06Sr04TiO3 thin films The effects of Mg doping on the microstruct
255 citations
TL;DR: In this article, the authors studied the dielectric loss of sintered aluminium oxide in an attempt to determine the causes of extrinsic loss, and found that impurities played an important role, but the microstructure also was a key factor.
Abstract: Low dielectric loss materials are required for applications in radio‐frequency and microwave communications. Aluminium is the second most abundant element in the Earth’s crust and aluminium oxide (alumina) is one of the commonest ceramics. Single crystals of aluminium oxide, i.e., sapphire, possess one of the lowest dielectric losses of any material. Polycrystalline alumina has a higher loss due to extrinsic factors. The dielectric loss of sintered alumina is studied in an attempt to determine the causes of extrinsic loss. Impurities are shown to play an important role, but the microstructure also is a key factor. High‐purity aluminas, sintered to near theoretical density, are found to display very low loss, tan δ=2.7×10−5 at 10 GHz. Doping alumina with titanium dioxide was found to reduce the tan δ=2×10−5.
255 citations