FeP nanoparticles: a new material for microwave absorption

2018 ◽  
Vol 2 (6) ◽  
pp. 1119-1125 ◽  
Author(s):  
Michael Green ◽  
Lihong Tian ◽  
Peng Xiang ◽  
James Murowchick ◽  
Xinyu Tan ◽  
...  
Keyword(s):  
Microwave Absorption ◽  
Reflection Loss ◽  
New Material ◽  
Absorption Performance ◽  
Tunable Frequency ◽  
Microwave Absorption Performance

FeP nanoparticles, fabricated through a facile thermal phosphorization process, have displayed impressive microwave absorption performance with tunable frequency and large reflection loss (RL) values.

scholarly journals High-efficiency and ultra-thin electromagnetic wave absorption xAl2O3-(1-x)Sr0.85Gd0.15TiO3 ceramics in X-band

2020 ◽  
Author(s):  
Hui Xie ◽  
Chaoqun Yang ◽  
Yingying Zhou ◽  
Zhaowen Ren ◽  
Ping Liu
Keyword(s):  
Microwave Absorption ◽  
Reflection Loss ◽  
High Efficiency ◽  
Impedance Matching ◽  
Frequency Dispersion ◽  
Interfacial Polarization ◽  
Peak Frequency ◽  
Microwave Absorbing Materials ◽  
Absorption Performance ◽  
Microwave Absorption Performance

Abstract xAl2O3-(1-x)Sr0.85Gd0.15TiO3(x=0.2, 0.3, 0.4, 0.5) ceramics were fabricated by hot-press sintering. Their morphology, phase composition, conductivity, dielectric properties as well as microwave absorption performance were examined by scanning electron microscopy (SEM), X-ray diffraction (XRD), multifunction digital four-probe meter and vector network analysis, respectively. The microwave absorption of as-prepared xAl2O3-(1-x)Sr0.85Gd0.15TiO3 ceramics demonstrates excellent microwave absorbability. It is unexpectedly found that with a thickness of only 0.346 mm, xAl2O3-(1-x)Sr0.85Gd0.15TiO3 (x=0.2) ceramic exhibits an absorption bandwidth of 3.7 GHz (8.7-12.4 GHz), being consequential to reflection loss less than -10 dB (over 90% of microwave absorption). It is as well discovered that the minimum reflection loss and absorption peak frequency of xAl2O3-(1-x)Sr0.85Gd0.15TiO3 (x=0.3) with a thickness of 0.436 mm were -45.43 dB and 11.3 GHz, respectively. The prominent microwave absorption performance of the ceramic with such a thin thickness can be attributed to strong interfacial polarization, dielectric frequency dispersion, and good electromagnetic impedance matching. It indicates that the xAl2O3-(1-x)Sr0.85Gd0.15TiO3 ceramics with appropriate Al2O3 mass fraction and thickness showing good potential for effective microwave absorbing materials.

Efficient microwave traps with markedly enhanced interfacial polarization and impedance matching enabled by dual-shelled, dual-cavity magnetic@dielectric hollow nanospheres

2020 ◽  
Vol 8 (46) ◽  
pp. 16489-16497
Author(s):  
Jiasong Hua ◽  
Wenjun Ma ◽  
Xiaoyun Liu ◽  
Qixin Zhuang ◽  
Zeyang Wu ◽  
...  
Keyword(s):  
Microwave Absorption ◽  
Reflection Loss ◽  
Impedance Matching ◽  
Interfacial Polarization ◽  
Hollow Nanospheres ◽  
Absorption Performance ◽  
Microwave Absorption Performance ◽  
Magnetic Dielectric ◽  
Minimum Reflection Loss

Dual-shelled, dual-cavity Fe3O4@TiO2 hollow nanospheres exhibit an outstanding microwave absorption performance with a minimum reflection loss of −60.17 dB.

scholarly journals Microwave Absorption Performance of Graphene Nanoplatelets Dispersed SiC

2019 ◽  
Vol 69 (5) ◽  
pp. 437-441 ◽  
Author(s):  
Anil Kumar Maurya ◽  
Saurabh Mr ◽  
Samarjit Singh ◽  
Abhishek Kumar
Keyword(s):  
Microwave Absorption ◽  
Reflection Loss ◽  
Graphene Nanoplatelets ◽  
Enhanced Absorption ◽  
Microwave Attenuation ◽  
Microwave Signals ◽  
Absorption Performance ◽  
Sic Composites ◽  
5 Ghz ◽  
Microwave Absorption Performance

Microwave absorption performance of graphene nanoplatelets based SiC composites have been studied in the present work. Graphene nanoplatelets were dispersed at varying weight fractions viz. 0.5, 1, 2, 2.5 and 3 wt.% in SiC using ultrasonication and ball milling methods. Microwave attenuation behaviour of the prepared composites have been observed in the 2-18 GHz range. The results reflect that dispersion of graphene in SiC proves to be very instrumental in attenuating the incident microwave signals translating into enhanced absorption. The enhancement in the microwave absorption performance is due to the presence of conductive graphene nanoplatelets which is very instrumental in promoting conduction and polarisation losses in the composite translating into enhanced absorption. For 3 wt.% graphene nanoplatelets dispersion in SiC, the value of reflection loss (RL) was obtained as -38.67 dB at 14.67 GHz frequency for 2.2 mm thickness with the corresponding bandwidth of 5 GHz.

Two-dimensional nanosheets of MoS2: a promising material with high dielectric properties and microwave absorption performance

Nanoscale ◽  
2015 ◽  
Vol 7 (38) ◽  
pp. 15734-15740 ◽  
Author(s):  
Ming-Qiang Ning ◽  
Ming-Ming Lu ◽  
Jing-Bo Li ◽  
Zhuo Chen ◽  
Yan-Kun Dou ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Microwave Absorption ◽  
Reflection Loss ◽  
Promising Material ◽  
Two Dimensional ◽  
Wide Bandwidth ◽  
Absorption Performance ◽  
High Dielectric ◽  
Microwave Absorption Performance ◽  
Minimum Reflection Loss

MoS2 nanosheets (MoS2-NS) exhibit a minimum reflection loss of −38.42 dB and a wide bandwidth with effective attenuation (<−10 dB) up to 4.1 GHz at a thickness of 2.4 mm.

Facile synthesis of a CNT@Fe@SiO2 ternary composite with enhanced microwave absorption performance

RSC Advances ◽  
2015 ◽  
Vol 5 (94) ◽  
pp. 76836-76843 ◽  
Author(s):  
Hualiang Lv ◽  
Guangbin Ji ◽  
Haiqian Zhang ◽  
Youwei Du
Keyword(s):  
Microwave Absorption ◽  
Reflection Loss ◽  
Core Structure ◽  
Pyrolysis Process ◽  
Facile Synthesis ◽  
Ternary Composite ◽  
Absorption Performance ◽  
Microwave Absorption Performance

The CNTs@Fe@SiO2 ternary core-structure was prepared by a simple two-step approach consisting a pyrolysis process and then decomposition. At a thin thickness of 1.5 mm, the optimal reflection loss value of the ternary composite is as high as −14.2 dB.

Ferromagnetic Co20Ni80 nanoparticles encapsulated inside reduced graphene oxide layers with superior microwave absorption performance

2019 ◽  
Vol 7 (10) ◽  
pp. 2943-2953 ◽  
Author(s):  
Xuefeng Yu ◽  
Lei Wang ◽  
Jiwei Liu ◽  
Shuyan Xue ◽  
Liting Yang ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Microwave Absorption ◽  
Reflection Loss ◽  
Oxide Layers ◽  
Absorption Bandwidth ◽  
Reduced Graphene ◽  
Microwave Loss ◽  
Absorption Performance ◽  
Microwave Absorption Performance

The size regulation of rGO/Co20Ni80 nanocomposites improves microwave loss properties in terms of the reflection loss value and absorption bandwidth.

scholarly journals Excellent microwave absorption properties by tuned electromagnetic parameters in polyaniline-coated Ba0.9La0.1Fe11.9Ni0.1O19/reduced graphene oxide nanocomposites

RSC Advances ◽  
2017 ◽  
Vol 7 (58) ◽  
pp. 36433-36443 ◽  
Author(s):  
Juhua Luo ◽  
Yue Zuo ◽  
Pan Shen ◽  
Zhu Yan ◽  
Kang Zhang
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Microwave Absorption ◽  
Reflection Loss ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Reduced Graphene ◽  
Absorption Performance ◽  
Microwave Absorption Performance ◽  
Minimum Reflection Loss

The obvious enhancement of microwave absorption performance of Ba0.9La0.1Fe11.9Ni0.1O19/reduced graphene oxide/polyaniline ternary nanocomposites in 2–18 GHz was observed. The minimum reflection loss can reach −49.1 dB with thickness of 1.9 mm.

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.

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