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: In this article, a series of NiCo2O4 absorbers constructed by different building cornerstones were successfully fabricated through precipitation-hydrothermal method by adjusting the precipitants from NaHCO3, urea, and NaOH to Na2CO3.
Abstract: A series of NiCo2O4 absorbers constructed by different building cornerstones were successfully fabricated through precipitation-hydrothermal method. By adjusting the precipitants from NaHCO3, urea, and NaOH to Na2CO3, the NiCo2O4 absorbers assembled through zero-dimensional (0D) nanoparticles, one-dimensional (1D) nanorods and two-dimensional (2D) micro/nanoplates could be obtained. We found that NiCo2O4 absorbers formed by two-dimensional building blocks displayed high dielectric loss capacity but rather poor magnetic loss, resulting in inferior electromagnetic (EM) wave absorption performance. On the contrary, the sphere-like and urchin-like NiCo2O4 EM wave absorbing materials assembled by zero-dimensional nanoparticles and one-dimensional nanorods possess multiple magnetic loss mechanisms, which can achieve a balance with dielectric loss, leading to remarkably promoted EM wave attenuation performance. The effective absorption bandwidth for urchin-like and sphere-like NiCo2O4 is up to 5.84 GHz and 6.08 GHz at thickness of 1.88 mm and 2.06 mm, respectively. Moreover, the minimum reflection loss (RLmin) of sphere-like NiCo2O4 also reaches to −42.8 dB as well. The thin thickness, strong absorption capacity and wide effective absorption bandwidth (fe), which is the widest among the previously reported NiCo2O4-based absorbers so far, is prone to be a competitive candidate as the materials for EM wave absorption devices.
122 citations
TL;DR: In this article, a new microwave dielectric ceramics, i.e., Mg 4 (Nb 2− x Ta x )O 9 (MNT) solid solutions, were synthesized and their microwave die-lectric properties and crystal structure were investigated.
Abstract: New microwave dielectric ceramics, i.e. Mg 4 (Nb 2− x Ta x )O 9 (MNT) solid solutions, were synthesized and their microwave dielectric properties and crystal structure were investigated in this study. From the discrete variational Xα (DV-Xα) method, it was found that the Ta–O bonds in the TaO 6 octahedron become more covalent than Nb–O bonds in the NbO 6 octahedron; this result leads to the decrease of the ionicity in the Ta 5+ ion. The dielectric constants of MNT were slightly decreased from 12.4 to 11.5; this result might be due to the covalent interaction of Ta–O bonding. The quality factors of the samples were found to exhibit high value ( Q · f ≒350 000 GHz for x =2) which is comparable to those of Al 2 O 3 .
122 citations
TL;DR: In this article, the authors reported quality factors of up to 500x10³ in superconducting resonators at the single photon levels needed for circuit quantum electrodynamics.
Abstract: We report quality factors of up to 500x10³ in superconducting resonators at the single photon levels needed for circuit quantum electrodynamics. This result is achieved by using NbTiN and removing the dielectric from regions with high electric fields. As demonstrated by a comparison with Ta, the crucial sources of intensity-dependent loss are dielectrics on the surface of the metal and substrate.
121 citations
TL;DR: In this article, the dielectric properties of the polymer matrix nanocomposites with hybrid fillers were improved by optimizing the synergistic effects between the charge storage behavior of the ferroelectric phase and the charge transport behaviour of the conductive phase.
121 citations
TL;DR: In this paper, the dielectric response of the Sr9Ce2Ti12O36 ceramics loaded high density polyethylene and epoxy resin was investigated.
Abstract: The present communication investigates the dielectric response of the Sr9Ce2Ti12O36 ceramics loaded high density polyethylene and epoxy resin. Sr9Ce2Ti12O36 ceramic filled polyethylene and epoxy composites were prepared using hot blending and mechanical mixing, respectively. 40 vol % ceramic loaded polyethylene has relative permittivity of 12.1 and loss tangent of 0.004 at 8 GHz, whereas the corresponding composite using epoxy as matrix has permittivity and loss tangent of 14.1 and 0.022, respectively. The effective medium theory fits relatively well for the observed permittivity of these composites.
121 citations