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, W-type barium hexaferrites with compositions of Ba 1 Co 09 Zn 11 Fe 16 O 27 and Ba 08 La 02 Co 09Zn 11 Zn 14 O 27 were synthesized by the sol-gel method in the 2-18 GHz frequency range.
113 citations
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TL;DR: In this article, the authors investigated polymer nanocomposites containing a series of Al@Al2O3 nanofillers with different shell thicknesses and showed that the high dielectric constant of percolative composites is contributed by a fast intra-particle polarization and a slow interparticle polarization.
113 citations
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TL;DR: In this paper, the stability of perovskite BiFeO3 was increased by the present modification, and the single-phase (Bi 1−−xCax)(Fe 1 −−xTix)O3 solid solutions were obtained when x ≥ 0.15, where the symmetry changed from R3c (x≤ 0.2) to Pbnm (x ≤ 0.3).
Abstract: BiFeO3 multiferroic ceramics were modified by introducing CaTiO3. The stability of perovskite BiFeO3 was increased by the present modification, and the single-phase (Bi1 − xCax)(Fe1 − xTix)O3 solid solutions were obtained when x ≥ 0.15, where the symmetry changed from R3c (x ≤ 0.2) to Pbnm (x ≥ 0.3). The ferroelectric property of BiFeO3 was enhanced by introducing CaTiO3 because of the reduction of leakage current and the increase of resistivity. The increased dielectric constant, decreased dielectric loss, and enhanced remnant magnetization Mr were also obtained. The best combination of multiferroic characteristics were achieved at x = 0.2.
112 citations
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TL;DR: This study demonstrates that functionalised graphene sheets are ideal nanofillers for the development of new polymer composites with high dielectric constant values.
Abstract: A new functionalised graphene sheet (FGS) filled poly(dimethyl)siloxane insulator nanocomposite has been developed with high dielectric constant, making it well suited for applications in flexible electronics. The dielectric permittivity increased tenfold at 10 Hz and 2 wt.% FGS, while preserving low dielectric losses and good mechanical properties. The presence of functional groups on the graphene sheet surface improved the compatibility nanofiller/polymer at the interface, reducing the polarisation process. This study demonstrates that functionalised graphene sheets are ideal nanofillers for the development of new polymer composites with high dielectric constant values. PACS: 78.20.Ci, 72.80.Tm, 62.23.Kn
112 citations
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TL;DR: In this paper, the mesoporous polydopamine (CoMOF@MPDA) composites with a core-shell structure are prepared by the bottom-up monomicelle assembly.
Abstract: Electromagnetic wave absorbents with hierarchically porous and core–shell structures have significantly positive influence on the electromagnetic wave absorption because of the enhanced interfacial polarization. Furthermore, the core–shell structure also introduces components with strong dielectric loss and good resistance to chemical corrosion. Herein, the cobalt–metal–organic frameworks @mesoporous polydopamine (Co–MOF@MPDA) composites with a core–shell structure are prepared by the bottom-up monomicelle assembly. After calcination, the Co@S-doped carbon core and mesoporous N-doped carbon shell (Co@SC@MNC) were obtained. Through adjusting the calcination temperature, the dielectric and magnetic loss can be tuned, resulting in the strong absorption capability for the electromagnetic wave. The minimum reflection loss reaches −72.3 dB, while the effective absorption bandwidth is as broad as 6.0 GHz. The unique structure and the formation of internal cavity between Co@SC and MNC contribute to the interfacial polarization. The enhancement of the dipole polarization loss and conduction loss are ascribed to the S, N-doped hierarchically porous carbon. Importantly, the presence of Co nanoparticles facilitates the magnetic–dielectric synergy to improve the impedance matching due to the introduction of magnetic loss. The novel structural design has potential application in the electromagnetic wave absorption field.
112 citations