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Dielectric Ceramic Waveguide Filters

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  • Time of issue:2019-10-18 15:41
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(Summary description)  With the continuous consumption of non-renewable energy and the increasingly serious environmental problems, the development and utilization of high-performance, environmentally friendly energy storage materials has become a current research hotspot in science and technology and industry. Dielectric energy storage capacitors have shown great application prospects in the fields of automotive electronics, communications, aviation, aerospace and cutting-edge technologies due to their advantages of high power density, fast charging and discharging speeds, excellent stability and low manufacturing costs.

Dielectric Ceramic Waveguide Filters

(Summary description)  With the continuous consumption of non-renewable energy and the increasingly serious environmental problems, the development and utilization of high-performance, environmentally friendly energy storage materials has become a current research hotspot in science and technology and industry. Dielectric energy storage capacitors have shown great application prospects in the fields of automotive electronics, communications, aviation, aerospace and cutting-edge technologies due to their advantages of high power density, fast charging and discharging speeds, excellent stability and low manufacturing costs.

  • Categories:News
  • Author:
  • Origin:
  • Time of issue:2019-10-18 15:41
  • Views:
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  With the continuous consumption of non-renewable energy and the increasingly serious environmental problems, the development and utilization of high-performance, environmentally friendly energy storage materials has become a current research hotspot in science and technology and industry. Dielectric energy storage capacitors have shown great application prospects in the fields of automotive electronics, communications, aviation, aerospace and cutting-edge technologies due to their advantages of high power density, fast charging and discharging speeds, excellent stability and low manufacturing costs.

  In recent years, Dong Xianlin's team at the Shanghai Institute of Silicate Technology, Chinese Academy of Sciences, has carried out research on new lead-free dielectric materials for energy storage capacitors and achieved a series of research results. The team designed and synthesized a new type of high-performance BaTiO3-based relaxation ferroelectric (BaTiO3-Bi(Zn1/2Sn1/2)O3) energy storage dielectric material using barium titanate (BaTiO3) as the substrate. By introducing Bi(Zn1/2Sn1/2)O3 into the BaTiO3 matrix, the formation of A-site and B-site ionic disorder disrupts the ferroelectric long-range ordering and transforms the ferroelectric domains into polar nanomicroregions. The fast response of the polar nano-microregions under the applied electric field is utilized to significantly improve the energy storage density and energy storage efficiency of the material. The dielectric material not only combines high energy storage density (2.41 J/cm3) and high energy storage efficiency (91.6%), but also exhibits excellent temperature (20~160 °C), frequency (1~1000 Hz), and fatigue (105 cycles) stability in its energy storage properties, which can meet the requirements of X8R capacitors. It is clarified that the high stability of the energy storage properties is due to the “weakly coupled relaxation behavior” of the polar nanocells. This work was published as a HotPaper in Journal of Materials ChemistryC (J. Mater. Chem. C, 2018, 6, 8528-8537).

  Miniaturization and lightweighting have been important trends in energy storage capacitors. To this end, the team focused on the sodium niobate (NaNbO3) system, which has not yet been reported in the literature.The bulk density of NaNbO3 is only 4.55 g/cm3, which, compared to other lead-free dielectric material systems such as bismuth ferrite (8.37 g/cm3), barium titanate (6.02 g/cm3), and sodium bismuth titanate (5.977 g/cm3), has an obvious advantages. However, the electric field-induced substable ferroelectricity and the low electric strength resistance due to the volatilization of sodium alkali metal elements constrain the application of NaNbO3 in energy storage. The team has successively adopted the cis-electrode modulation and A-site vacancy strategy to enhance the energy storage properties of NaNbO3, and constructed two new NaNbO3-based energy storage medium ceramic materials: NaNbO3-SrTiO3 and Na1-3xBixNbO3. Both of these two NaNbO3-based energy storage medium ceramic materials exhibit excellent storage, charge/discharge and stability characteristics, of which the Na1-3xBixNbO3 and the Na1-3xBixNbO3 are excellent. The comprehensive energy storage characteristics of Na1-3xBixNbO3 (energy storage density: 4.03 J/cm3, energy storage efficiency: 85.4%, and power density: 62.5 MW/cm3) are the optimal values reported in the literature so far. This work opens up a new application direction for NaNbO3 materials, and also provides new methods and ideas for designing high energy storage lead-free dielectric materials. The related research results were published in JournalofMaterialsChemistryA(J.Mater.Chem.A,2018,6,17896-17904) and ACSSustainableChemistry&Engineering(ACSSustainableChem. Eng. 2018,6,10,12755-12765) on.

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