Communication—Dielectric Dispersion of Chromium Carbide/Copper Calcium Titanate Metacomposites: Epsilon-Negative, Epsilon-Near-Zero, and Inductive Character

2021 ◽  
Vol 10 (2) ◽  
pp. 023006
Author(s):  
Huan Ye ◽  
Yuyan Li ◽  
Yunpeng Qu ◽  
Zongxiang Wang ◽  
Jiahong Tian ◽  
...  
Keyword(s):  
Chromium Carbide ◽  
Calcium Titanate ◽  
Dielectric Dispersion ◽  
Inductive Character ◽  
Epsilon Near Zero

scholarly journals Communication—Function-Oriented Design of 3D Carbon Networks Toward Negative Permittivity at kHz Frequencies

2022 ◽  
Author(s):  
Yuyan Li ◽  
Huan Ye ◽  
Yunpeng Qu ◽  
Zongxiang Wang ◽  
Kai Sun
Keyword(s):  
Carbon Nanotube ◽  
Percolation Threshold ◽  
Three Dimensional ◽  
Low Frequency ◽  
Calcium Titanate ◽  
Negative Permittivity ◽  
Free Carriers ◽  
Carbon Networks ◽  
Communication Function ◽  
Inductive Character

Abstract Three-dimensional (3D) carbon networks composed of graphene (GR) and carbon nanotube (CNT) were constructed in copper calcium titanate (CCTO) in order to realize negative permittivity behavior. The results show that negative permittivity can be obtained at kHz frequencies above percolation threshold when 3D carbon networks are successfully constructed. Negative permittivity originates from the low-frequency plasmonic state which is explained by the Drude model. The magnitude of negative permittivity was tuned between 105 and 106 which significantly correlates with concentration of free carriers. Moreover, the reactance spectra clarify the inductive character of negative permittivity materials.

Tailorable epsilon-negative and epsilon-near-zero behavior of TiC/CCTO metacomposites: Low-frequency plasma oscillation

2021 ◽  
pp. 2150015
Author(s):  
Baogang Ding ◽  
Yunpeng Qu ◽  
Kai Sun ◽  
Runhua Fan
Keyword(s):  
Plasma Oscillation ◽  
Three Dimensional ◽  
Low Frequency ◽  
Calcium Titanate ◽  
Negative Permittivity ◽  
Free Electrons ◽  
Frequency Plasma ◽  
Collective Plasma ◽  
Negative Formula ◽  
Epsilon Near Zero

Epsilon-negative ([Formula: see text]) and epsilon-near-zero (ENZ) property was demonstrated in titanium carbide/copper calcium titanate (TiC/CCTO) metacomposites. Benefiting from the moderate concentration of free electrons in TiC filler and its adjustable three-dimensional (3D) networks, weakly negative permittivity ([Formula: see text]200 at 20 MHz) was achieved. Not only that, tailoring the negative permittivity of metacomposites from [Formula: see text]200 to [Formula: see text]2060, [Formula: see text]4200, [Formula: see text]14000 and [Formula: see text]70000 at 20 MHz was realized by simply increasing TiC content. Besides, Drude model was used to explain the radio-frequency (RF) negative permittivity and quantified the collective plasma oscillation in TiC networks.

Friction Stir Welding of Copper Alloys by PTA Hardfaced Chromium Carbide Tools

2016 ◽  
Vol 49 (2) ◽  
pp. 70
Author(s):  
A. Baskaran ◽  
K. Shanmugam ◽  
V. Balasubramanian
Keyword(s):  
Friction Stir Welding ◽  
Chromium Carbide ◽  
Copper Alloys ◽  
Friction Stir

Effect of Chromium Carbide Introduced into a Flux Cored Wire Charge on the Structure and Properties of the Hardfacing Deposit

2020 ◽  
Vol 2020 (13) ◽  
pp. 1485-1490
Author(s):  
N. V. Kobernik ◽  
A. S. Pankratov ◽  
S. S. Sorokin ◽  
V. V. Petrova ◽  
A. L. Galinovskii ◽  
...  
Keyword(s):  
Chromium Carbide ◽  
Structure And Properties ◽  
Cored Wire

Dielectric dispersion in viscous polar liquids

1956 ◽  
Author(s):  
J. W. Winslow ◽  
R. J. Good ◽  
P. E. Berghausen
Keyword(s):  
Dielectric Dispersion ◽  
Polar Liquids

Photon Acceleration Using a Time-Varying Epsilon-near-Zero Metasurface

ACS Photonics ◽  
2021 ◽  
Author(s):  
Cong Liu ◽  
M. Zahirul Alam ◽  
Kai Pang ◽  
Karapet Manukyan ◽  
Orad Reshef ◽  
...  
Keyword(s):  
Time Varying ◽  
Photon Acceleration ◽  
Epsilon Near Zero
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