Preparation and Electromagnetic Property of Hexagonal W-Type Ferrite Obtained by the Sol-Gel Method

2011 ◽  
Vol 474-476 ◽  
pp. 1044-1048
Author(s):  
Zheng Xiong ◽  
Zhu Xi ◽  
Zhang Li Jun
Keyword(s):  
Microwave Absorption ◽  
Reflection Loss ◽  
Sol Gel ◽  
Electromagnetic Property ◽  
Element Composition ◽  
Vector Network Analyzer ◽  
Network Analyzer ◽  
Electromagnetic Parameters ◽  
Gel Method ◽  
Sol Gel Method

Hexagonal W-type ferrite BaZn0.6Co1.4Fe16O27 was prepared by the sol-gel method. The formation, microstructure, element composition and phases were analyzed by TG-DTA, SEM, EDS and XRD. The electromagnetic parameters and microwave absorption capability were measured by the microwave vector network analyzer. The results showed that the reflection loss of the ferrite BaZn0.6Co1.4Fe16O27 in the spectrum of 8-18GHz came up to -10dB and came up to -20dB in the spectrum of 9.5-16.4GHz.

Preparation and Electromagnetic Property of Hexagonal W-Type Ferrite Obtained by the Method of Coprecipitation with Flux

2011 ◽  
Vol 228-229 ◽  
pp. 645-650 ◽  
Author(s):  
Zheng Xiong ◽  
Zhu Xi ◽  
Zhang Li Jun
Keyword(s):  
Microwave Absorption ◽  
Reflection Loss ◽  
Electromagnetic Property ◽  
Element Composition ◽  
Vector Network Analyzer ◽  
Network Analyzer ◽  
Electromagnetic Parameters

Hexagonal W-type ferrite BaZn0.6Co1.4Fe16O27 was prepared by the method of coprecipitation with flux. The formation, microstructure, element composition and phases were analyzed by TG-DTA, SEM, EDS and XRD. The micrograph showed that the ferrite grains appeared to be hexagonal schistose texture obviously and the dimension of the grains was about 10μm. The product powders were composed mainly of BaZn0.6Co1.4Fe16O27 and few other phases such as α-Fe2O3, M-type ferrite (BaFe12O19) and S-type ferrite (MeFe2O4, Me for Zn or Co) were also found in the product. Electromagnetic parameters and microwave absorption capability were measured by the microwave vector network analyzer. The results showed that the reflection loss (RL) of the sample came up to -10dB in the spectrum from 8GHz to 18GHz and -20dB in the spectrum from 9.5GHz to 16GHz.

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.

scholarly journals Preparation and Identification of BaFe2O4 Nanoparticles by the Sol–Gel Route and Investigation of Its Microwave Absorption Characteristics at Ku-Band Frequency Using Silicone Rubber Medium

Proceedings ◽  
2018 ◽  
Vol 2 (17) ◽  
pp. 5234
Author(s):  
Reza Peymanfar ◽  
Mitra Rahmanisaghieh ◽  
Arezoo Ghaffari ◽  
Yousef Yassi
Keyword(s):  
Microwave Absorption ◽  
Silicone Rubber ◽  
Sol Gel ◽  
Microwave Absorption Properties ◽  
Band Frequency ◽  
Gel Method ◽  
Sol Gel Method ◽  
High Frequency Devices ◽  
Spinel Structures ◽  
Ku Band

In the last decade, spinel structures have been widely explored due to widespread applications in antibacterial nanocomposites, memory devices, catalysts, photocatalysts, high-frequency devices, and electromagnetic absorbing materials. In this study, BaFe2O4 spinel structures were synthesized through the sol–gel method using a low sintering temperature and were identified by vibrating sample magnetometer (VSM), X-ray powder diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, field emission scanning electron microscopy (FE-SEM), and vector network analyzer (VNA) analysis. Results showed that uniform and pure crystal structures of BaFe2O4 nanoparticles were prepared based on the sol–gel method. Finally, BaFe2O4 nanoparticles were blended by silicone rubber to characterize the microwave absorption properties of the nanocomposite at the ku-band frequency. According to the VNA results, the BaFe2O4/silicone rubber nanocomposite with 1.75 mm thickness absorbed more than 94.38% of microwave irradiation along the ku-band frequency and the maximum reflection loss of the BaFe2O4/silicone rubber nanocomposite was 51.67 dB at 16.1 GHz.

Magnetic and microwave absorption properties of Ni1−x Zn x Fe2O4 nanocrystalline synthesized by sol-gel method

2012 ◽  
Vol 56 (1) ◽  
pp. 13-19 ◽  
Author(s):  
Min Zhang ◽  
QiangChun Liu ◽  
ZhenFa Zi ◽  
YuQiang Dai ◽  
XueBin Zhu ◽  
...  
Keyword(s):  
Microwave Absorption ◽  
Sol Gel ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Gel Method ◽  
Sol Gel Method

Microwave absorption studies of nanocrystalline prepared by the citrate sol–gel method

2012 ◽  
Vol 152 (3) ◽  
pp. 199-203 ◽  
Author(s):  
Ali Sharbati ◽  
Javad Mola Verdi Khani ◽  
Gholam Reza Amiri
Keyword(s):  
Microwave Absorption ◽  
Sol Gel ◽  
Gel Method ◽  
Sol Gel Method ◽  
Absorption Studies

Researches on the Formation and Thermal Treatment of (Zn0.3Co0.7)2-W Type Ferrite

2013 ◽  
Vol 706-708 ◽  
pp. 248-253
Author(s):  
Ling Liu ◽  
Zheng Xiong ◽  
Hui Hu
Keyword(s):  
Crystal Structure ◽  
Thermal Treatment ◽  
Treatment Condition ◽  
Element Composition ◽  
Vector Network Analyzer ◽  
Hexagonal Ferrite ◽  
Thermal Treatments ◽  
Network Analyzer ◽  
Electromagnetic Parameters ◽  
Thermal Treatment Condition

W-type hexagonal ferrite BaZn0.6Co1.4Fe16O27 was prepared by the method of coprecipitation with flux. Various products were prepared by different thermal treatments. The microstructure, element composition, crystal structure, phases and dynamic electromagnetic parameters of the products were analyzed by SEM, EDS, XRD and the microwave vector network analyzer. The formation of the ferrite was studied and the optimal thermal treatment condition was confirmed, under which pure tiny W-type hexagonal ferrite powders were achieved.

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