Effect of Substitution of Mn, Cu, and Zr on the Structural, Magnetic, and Ku-Band Microwave-Absorption Properties of Strontium Hexaferrite Nanoparticles

2016 ◽  
Vol 45 (8) ◽  
pp. 4154-4161 ◽  
Author(s):  
Mohammad Rostami ◽  
Mahmood Moradi ◽  
Reza Shams Alam ◽  
Reza Mardani
Keyword(s):  
Microwave Absorption ◽  
Strontium Hexaferrite ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Ku Band

EFFECT OF Nd-DOPING ON THE NANOCRYSTALLITE SIZE AND MICROWAVE ABSORPTION PROPERTIES OF Sr-HEXAFERRITE

2011 ◽  
Vol 04 (03) ◽  
pp. 283-287 ◽  
Author(s):  
H. KHANMOHAMMADI ◽  
S. A. SEYYED EBRAHIMI
Keyword(s):  
Crystallite Size ◽  
Microwave Absorption ◽  
Average Crystallite Size ◽  
Strontium Hexaferrite ◽  
Resin Matrix ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Calcination Temperatures ◽  
Nanocrystallite Size ◽  
Scherrer Formula

Nd -doped M -type Strontium hexaferrite powders with composition of Sr 1-x Nd x Fe 12 O 19(x = 0, 0.1, 0.2) were prepared by conventional ceramic method at various calcination temperatures. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used for characterization of the obtained powders. The results showed that by increasing Nd doping, the single phase magnetoplumbite structure has been formed at higher temperatures. The average crystallite size of the samples calculated by the Scherrer formula indicates that Nd -doping resulted in a significant decrease in the mean crystallite size. The hexaferrite-polymer bulk composites in epoxy resin matrix, with ferrite ratio of 90 wt.%, were also prepared. The microwave absorption properties of these composites were investigated in 8–12 GHz frequency range by means of a vector network analyzer. Due to the reflection loss measurements, Nd -doped Sr -hexaferrite could be a promising material for microwave absorption applications in X-band.

scholarly journals Preparation and Characterization of CuFe2O4 Nanoparticles by the Sol-Gel Method and Investigation of Its Microwave Absorption Properties at Ku-Band Frequency Using Silicone Rubber

Proceedings ◽  
2018 ◽  
Vol 2 (17) ◽  
pp. 1155 ◽  
Author(s):  
Reza Peymanfar ◽  
Farzaneh Azadi ◽  
Yousef Yassi
Keyword(s):  
Microwave Absorption ◽  
Silicone Rubber ◽  
Electromagnetic Waves ◽  
Sol Gel ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Band Frequency ◽  
Gel Method ◽  
Sol Gel Method ◽  
Ku Band

Recently, using microwave devices that emit electromagnetic waves and enhance the convenience of life have increased; however, they can be harmful to the environment. In this study, CuFe2O4 nanoparticles were prepared through the conventional sol-gel procedure and then were characterized by X-ray powder diffraction (XRD), vibrating sample magnetometer (VSM), field emission scanning electron microscopy (FE-SEM), Fourier transform infrared spectroscopy (FT-IR), and vector network analyzer (VNA) using S parameters. Results illustrated that pure crystal structure of magnetic nanoparticles has been synthesized by the sol-gel method with magnetic saturation (Ms) of 22 emu/g. Finally, CuFe2O4 nanoparticles were composited by silicone rubber to investigate its microwave absorption properties. Results showed that the CuFe2O4/silicone rubber nanocomposite absorbed more than 94.87% of the microwave irradiation at ku-band frequency with 1.7 mm thickness and the maximum reflection loss was −60.38 dB at 16.1 GHz. Magnetic and dielectric properties of the CuFe2O4 nanoparticles and silicone rubber polymeric matrix in the nanocomposite demonstrated desirable microwave absorption properties.

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