Enhanced microwave absorption features of Ba3Co2Fe24O41 hexaferrite by high lanthanium doping concentration

Controlling material structure and its electromagnetic properties, including complex permittivity and permeability, could enhance the microwave absorption performance of the material in terms of reflection loss and effective absorption bandwidth. In this study, La‐substituted barium hexaferrite, Ba3...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2022-06, Vol.105 (6), p.4122-4134
Main Authors: Tran, Ngo, Yang, Ruey‐Bin, Jeong, Woo Hyun, Manh, Do Hung, Phan, The‐Long, Lee, Bo Wha
Format: Article
Language:English
Subjects:
Ba3Co2Fe24O41
Barium hexaferrite
Coercivity
Complex permittivity
Doping
Electromagnetic properties
hexaferrite
La doping
Magnetic properties
Magnetic saturation
Magnetization
Microwave absorbers
Microwave absorption
Thickness
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Summary:Controlling material structure and its electromagnetic properties, including complex permittivity and permeability, could enhance the microwave absorption performance of the material in terms of reflection loss and effective absorption bandwidth. In this study, La‐substituted barium hexaferrite, Ba3−xLaxCo2Fe24O41 (x = 0, 0.1, 0.3, and 0.5) compounds were successfully prepared using the solid‐state reaction method, and their corresponding microstructures, static magnetic properties, and electromagnetic features in 2–18 GHz were investigated. The doping of La content increased saturation magnetization, coercivity, and remnant magnetization. The Ba2.7La0.3Co2Fe24O41 epoxied sample with 3.5 mm thickness possessed an excellent microwave absorption of −47.3 dB at 3.52 GHz, and its corresponding effective absorption bandwidths were 3.75 GHz (2.25–6 GHz) and 0.57 GHz (17.43–18 GHz). It is shown that doping with various La concentrations on Ba3Co2Fe24O41 can be used as an effective technique to tune the performance of microwave absorbers based on barium hexaferrite.
ISSN:0002-7820
1551-2916
DOI:10.1111/jace.18378