Article (Scientific journals)
Structural, magnetic and microwave characterization of polycrystalline Z-Type Sr3Co2Fe24O41 Hexaferrite
Kolev, S.; Peneva, P.; Krezhov, K. et al.
2020In Materials, 13 (10), p. 2355
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Keywords :
Magnetic phase transition; Microwave properties; Reflection losses; Z-type hexaferrite; Ferrite; Iron compounds; Magnetic fields; Magnetization; Microwaves; Silicon rubber; Sol-gels; Strontium compounds; External magnetic field; Magnetic phase transitions; Magnetization behavior; Magnetization curves; Microwave absorbing materials; Microwave characterization; Microwave reflection; Sol-gel auto-combustion; Cobalt compounds
Abstract :
[en] We report results on the structural and microwave properties and magnetic phase transitions in polycrystalline Sr3Co2Fe24O41 hexaferrite synthesized by sol-gel auto-combustion and acting as a filler in a composite microwave absorbing material. The zero-field-cooled (ZFC) and field-cooled (FC) magnetization curves revealed a change in the magnetization behavior at 293 K. The reflection losses in the 1-20 GHz range of the Sr3Co2Fe24O41 powder dispersed homogeneously in a polymer matrix of silicon rubber were investigated in both the absence and presence of a magnetic field. In the latter case, a dramatic rise in the attenuation was observed. The microwave reflection losses reached the maximum value of 32.63 dB at 17.29 GHz in the Ku-band. The sensitivity of the microwave properties of the composite material to the external magnetic field was manifested by the appearance of new reflection losses maxima. At a fixed thickness tm of the composite, the attenuation peak frequency can be adjusted to a certain value either by changing the filling density or by applying an external magnetic field. © 2020 by the authors.
Disciplines :
Physics
Chemistry
Author, co-author :
Kolev, S.;  Institute of Electronics, Bulgarian Academy of Sciences, 72 Tsarigradsko Chaussee, Sofia, 1784, Bulgaria
Peneva, P.;  Institute of Electronics, Bulgarian Academy of Sciences, 72 Tsarigradsko Chaussee, Sofia, 1784, Bulgaria
Krezhov, K.;  Institute of Electronics, Bulgarian Academy of Sciences, 72 Tsarigradsko Chaussee, Sofia, 1784, Bulgaria
Malakova, T.;  Institute of Electronics, Bulgarian Academy of Sciences, 72 Tsarigradsko Chaussee, Sofia, 1784, Bulgaria
Ghelev, C.;  Institute of Electronics, Bulgarian Academy of Sciences, 72 Tsarigradsko Chaussee, Sofia, 1784, Bulgaria
Koutzarova, T.;  Institute of Electronics, Bulgarian Academy of Sciences, 72 Tsarigradsko Chaussee, Sofia, 1784, Bulgaria
Kovacheva, D.;  Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, Academy Georgi Bonchev Street, bld. 11, Sofia, 1113, Bulgaria
Vertruyen, Bénédicte  ;  Université de Liège - ULiège > Département de chimie (sciences) > Chimie inorganique structurale
Closset, Raphaël ;  Université de Liège - ULiège > Département de chimie (sciences) > Département de chimie (sciences)
Tran, L. M.;  Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Ul. Okólna 2, Wroclaw, 50-422, Poland
Zaleski, A.;  Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Ul. Okólna 2, Wroclaw, 50-422, Poland
Language :
English
Title :
Structural, magnetic and microwave characterization of polycrystalline Z-Type Sr3Co2Fe24O41 Hexaferrite
Publication date :
2020
Journal title :
Materials
eISSN :
1996-1944
Publisher :
MDPI AG
Volume :
13
Issue :
10
Pages :
2355
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
BAS - Bulgarian Academy of Sciences [BG]
WBI - Wallonie-Bruxelles International [BE]
PAN - Polska Akademia Nauk [PL]
BNSF - Bulgarian National Science Fund [BG]
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