Ferromagnetic resonance of NiCoFe2O4 nanoparticles and microwave absorption properties of flexible NiCoFe2O4–carbon black/poly(vinyl alcohol) composites

2017 ◽  
Vol 19 (31) ◽  
pp. 20699-20712 ◽  
Author(s):  
Gopal Datt ◽  
Chetan Kotabage ◽  
A. C. Abhyankar
Keyword(s):  
Carbon Black ◽  
Ferromagnetic Resonance ◽  
Size Effects ◽  
Poly Vinyl Alcohol ◽  
Shielding Effectiveness ◽  
Temperature Dependent ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Highly Sensitive ◽  
Cationic Disorder

Cationic disorder and particle size effects are found to be highly sensitive to temperature dependent ferromagnetic resonance of Ni–Co ferrites and significantly improve the shielding effectiveness of flexible ferrite–carbon black/PVA composites.

Microwave absorption properties of carbon black and tetrapod-like ZnO whiskers composites

2013 ◽  
Vol 286 ◽  
pp. 7-11 ◽  
Author(s):  
Hui Qin ◽  
Qingliang Liao ◽  
Guangjie Zhang ◽  
Yunhua Huang ◽  
Yue Zhang
Keyword(s):  
Carbon Black ◽  
Microwave Absorption ◽  
Absorption Properties ◽  
Microwave Absorption Properties

scholarly journals An Inexpensive Route to Synthesize High-Purity CrO2 for EMI Shielding in X-Band Frequencies

2012 ◽  
Vol 2012 ◽  
pp. 1-4 ◽  
Author(s):  
Vivek Verma ◽  
Shahab Ahmad ◽  
Abdullah Dar ◽  
R. Kotnala
Keyword(s):  
High Purity ◽  
Microwave Frequency ◽  
External Pressure ◽  
Shielding Effectiveness ◽  
Emi Shielding ◽  
Frequency Range ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
X Band ◽  
Simplified Procedure

Rod-shaped high-purity samples of CrO2 have been synthesized by an inexpensive and simplified procedure. Here, we have prepared pure CrO2 without applying any external pressure or control it during synthesis. The sample prepared exhibited an improvement in saturation magnetization values, 68 emu/g at 300 K, 136 emu/g at 80 K, and uniform grained microstructure. The complex permittivity, permeability, and microwave absorption properties of high-purity CrO2 sample were investigated in the 8.2–12.2 GHz (X-band) microwave frequency range. Microwave measurements have shown the high shielding effectiveness due to absorption (SEA) of 20.3 dB. The high value of SEA suggests that CrO2 can be used as a promising electromagnetic shielding, EMI, material in 8.2–12.2 GHz (X-band) microwave frequency range.

Microwave absorption properties of Ag naowires/carbon black composites

2017 ◽  
Vol 26 (2) ◽  
pp. 025207 ◽  
Author(s):  
Hai-Long Huang ◽  
Hui Xia ◽  
Zhi-Bo Guo ◽  
Yu Chen ◽  
Hong-Jian Li
Keyword(s):  
Carbon Black ◽  
Microwave Absorption ◽  
Absorption Properties ◽  
Microwave Absorption Properties

scholarly journals Microwave Absorption Properties of Double-Layer RADAR Absorbing Materials Based on Doped Barium Hexaferrite/TiO2/Conducting Carbon Black

2014 ◽  
Vol 2014 ◽  
pp. 1-5 ◽  
Author(s):  
Sukanta Das ◽  
G. C. Nayak ◽  
S. K. Sahu ◽  
P. C. Routray ◽  
A. K. Roy ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Carbon Black ◽  
Microwave Absorption ◽  
Double Layer ◽  
Reflection Loss ◽  
Barium Hexaferrite ◽  
Conducting Layer ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Absorbing Materials

In this report, we demonstrate microwave absorption properties of barium hexaferrite, doped barium hexaferrite, titanium dioxide and conducting carbon black based RADAR absorbing material for stealth application. Double-layer absorbers are prepared with a top layer consisting of 30% hexaferrite and 10% titanium dioxide while the bottom layer composed of 30% hexaferrite and 10% conducting carbon black, embedded in chloroprene matrix. The top and bottom layers are prepared as impedance matching layer and conducting layer, respectively, with a total thickness of 2 mm. Microwave absorption properties of all the composites were analyzed in X-band region. Maximum reflection loss of −32 dB at 10.64 GHz was observed for barium hexaferrite based double-layer absorber whereas for doped barium hexaferrite based absorber the reflection loss was found to be −29.56 dB at 11.7 GHz. A consistence reflection loss value (>−24 dB) was observed for doped barium hexaferrite based RADAR absorbing materials within the entire bandwidth.

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