Effects of La3+ or Ti4+ doping on dielectric and microwave absorption performance of CaMnO3 in the 8.2–18 GHz

2021 ◽  
Vol 32 (8) ◽  
pp. 10329-10338
Author(s):  
Yin Liu ◽  
Dongmei Zhu ◽  
Yuchang Qing ◽  
Wancheng Zhou ◽  
Fa Luo
Keyword(s):  
Microwave Absorption ◽  
Absorption Performance ◽  
Microwave Absorption Performance

scholarly journals Effect of Reaction Time on Microwave Absorption Properties of Fe3O4 Hollow Spheres Synthesized via Ostwald Ripening

Materials ◽  
2019 ◽  
Vol 12 (18) ◽  
pp. 2921 ◽  
Author(s):  
Wei Huang ◽  
Yujiang Wang ◽  
Shicheng Wei ◽  
Bo Wang ◽  
Yi Liang ◽  
...  
Keyword(s):  
Reaction Time ◽  
Microwave Absorption ◽  
Ostwald Ripening ◽  
Impedance Matching ◽  
Hollow Spheres ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Magnetic Structures ◽  
Absorption Performance ◽  
Microwave Absorption Performance

Hollow magnetic structures have great potential to be used in the microwave absorbing field. Herein, Fe3O4 hollow spheres with different levels of hollowness were synthesized by the hydrothermal method under Ostwald ripening effect. In addition to their microstructures, the microwave absorption properties of such spheres were investigated. The results show that the grain size and hollowness of Fe3O4 hollow spheres both increase as the reaction time increases. With increasing hollowness, the attenuation ability of electromagnetic wave of Fe3O4 spheres increases first and then decreases, finally increases sharply after the spheres break down. Samples with strong attenuation ability can achieve good impedance matching, which it does preferentially as the absorber thickness increases. Fe3O4 hollow spheres show the best microwave absorption performance when the reaction time is 24 h. The minimum reflection loss (RL (min)) can reach −40 dB, while the thickness is only 3.2 mm.

Synthesis of novel hierarchical CoNi@NC hollow microspheres with enhanced microwave absorption performance

2021 ◽  
Vol 32 (6) ◽  
pp. 8000-8016
Author(s):  
Weixing Min ◽  
Dongwei Xu ◽  
Ping Chen ◽  
Guanzhen Chen ◽  
Qi Yu ◽  
...  
Keyword(s):  
Microwave Absorption ◽  
Hollow Microspheres ◽  
Absorption Performance ◽  
Microwave Absorption Performance

Sulfur‐doped biomass‐derived hollow carbon microtubes toward excellent microwave absorption performance

2021 ◽  
Vol 32 (5) ◽  
pp. 6260-6268
Author(s):  
Fei Huang ◽  
Shipeng Wang ◽  
Wei Ding ◽  
Min Zhang ◽  
Xiangkai Kong ◽  
...  
Keyword(s):  
Microwave Absorption ◽  
Absorption Performance ◽  
Hollow Carbon ◽  
Microwave Absorption Performance

scholarly journals Fish bone-derived interconnected carbon nanofibers for efficient and lightweight microwave absorption

2021 ◽  
Vol 3 (2) ◽  
Author(s):  
Yangyang Gu ◽  
Peng Dai ◽  
Wen Zhang ◽  
Zhanwen Su
Keyword(s):  
Microwave Absorption ◽  
Carbon Nanofibers ◽  
Three Dimensional ◽  
Fish Bone ◽  
Absorption Properties ◽  
Simple Method ◽  
Microwave Absorption Properties ◽  
Absorption Performance ◽  
Microwave Absorption Performance ◽  
Better Than

AbstractIn this work, we demonstrated a simple method for preparing three-dimensional interconnected carbon nanofibers (ICNF) derived from fish bone as an efficient and lightweight microwave absorber. The as-obtained ICNF exhibits excellent microwave absorption performance with a maximum reflection loss of –59.2 dB at the filler content of 15 wt%. In addition, the effective absorption bandwidth can reach 4.96 GHz at the thickness of 2 mm. The outstanding microwave absorption properties can be mainly ascribed to its well-defined interconnected nanofibers architecture and the doping of nitrogen atoms, which are also better than most of the reported carbon-based absorbents. This work paves an attractive way for the design and fabrication of highly efficient and lightweight electromagnetic wave absorbers.

scholarly journals Rational design of carbon shell-encapsulated cobalt nanospheres to enhance microwave absorption performance

2019 ◽  
Vol 29 (1) ◽  
pp. 88-93 ◽  
Author(s):  
Rambabu Kuchi ◽  
Monika Sharma ◽  
Sung Woo Lee ◽  
Dongsoo Kim ◽  
Namgee Jung ◽  
...  
Keyword(s):  
Microwave Absorption ◽  
Rational Design ◽  
Carbon Shell ◽  
Absorption Performance ◽  
Microwave Absorption Performance
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