Investigation into the structural features and microwave absorption of doped barium hexaferrites

Труханов, С.В.; Kostishyn, V.G.; Панина, Л. В.; Турченко, В. А.; Тишкевич, Д.И.; Trukhanova, E.L.; Yakovenko, O. S.; Matzui, L. Yu.

doi:10.1039/c7dt01708a

Cited by 139 publications

(35 citation statements)

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“…Magnitude of ε′ is found to decrease with increasing BHF content of x = 30-50 wt%. Similar behaviour of ε′ has been reported by Trukhanov et al [42][43][44] for diamagnetic substitution in BHF.…”

Section: Dielectric and Impedance Studiessupporting

confidence: 88%

Investigation of magnetoelectric effect in lead free K0.5Na0.5NbO3-BaFe12O19 novel composite system

2019

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Lead-free magnetoelectric composites (1 ̶ x)K 0.5 Na 0.5 NbO 3 -(x)BaFe 12 O 19 (x = 30, 40, and 50 wt%) are synthesized using solid state reaction method. X-ray diffraction (XRD) patterns confirm formation of diphase composites. Field emission scanning electron microscopy (FE-SEM) gives information about grain size, connectivity, and microstructure of constituent phases. Dielectric parameters of composite samples are studied as a function of temperature and the transition temperatures corresponding to both the constituent phases are observed in the composite samples. Dielectric constant has been found to decrease with addition of ferrite. Room temperature multiferroic behaviour has been confirmed using P-E and M-H hysteresis loops and magnetoelectric measurement. Polarization is found to decrease; however, magnetization increases with ferrite weight percentage. The highest α ME of 4.08 mV/(cm⋅Oe) is obtained for x = 30 wt% composite and it is realized that ferrite content significantly affects magnetoelectric behaviour.devices [6]. Large scale applications of ME composites given their higher ME coupling than that of single phase materials make them a beguiling research concern. ME coupling in the composites is basically a product property arising due to combination of magnetostrictive (magnetic/mechanical) phenomena in ferrite and piezoelectric (meachanical/electrical) phenomena of ferroelectric phases [7]. ) x [12], etc. are studied in the previous years. Generally for fabrication of good ME composites, the piezoelectric and magnetostrictive coefficients of constituent ferroelectric and ferrite phases should be high respectively. Furthermore high resistivity is equally desirable for avoiding leakage of charges [13]. K 0.5 Na 0.5 NbO 3 (KNN) has been considered as a bright prospect as a ferroelectric constituent for fabrication of lead-free ME composites. KNN exhibits reasonably well ferroelectric, piezoelectric, and dielectric characteristics. It exhibits high piezoelectric charge constant (d 33 ≈ 80-416 pC/N) and a high planar coupling coefficient (k P ≈ 45%) [14][15][16]. It also exhibits large remnant polarization and coercive field (P r = 21 μC/cm 2 , E c = 7.2 kV/cm, P r = 20 μC/cm 2 , and E c = 8 kV/cm) [14,17]. The M-type hexaferrites are widely studied materials due to their unique physical properties. The hexagonal ferrites including BaFe 12 O 19 (BHF) have magneto-plumbite structure. The crystal structure of BHF and diamagnetically doped BHF may be described by two space group viz. P6 3 /mmc (No. 194) and P6 3 mc (No. 186). The latter one is a non-centrosymmetric space group and is generally used to describe the crystal structure in order to explain the existence of non-zero spontaneous polarization [18,19]. These ferrites are usually termed as hard ferrites because of their high electrical resistivity, saturation magnetization, coercivity, and mechanical hardness [20]. At higher frequencies, hexaferrites have low-eddy current losses and high resistivity as compared to other magnetic materials [21]. ...

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Section: Dielectric and Impedance Studiessupporting

confidence: 88%

Investigation of magnetoelectric effect in lead free K0.5Na0.5NbO3-BaFe12O19 novel composite system

2019

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“…The microwave absorbers find applications in EMI shielding, anechoic chambers, cavity resonators and prevention of target detection from RADAR (Vinoy andJha 1995, Dixon 2012). Hexaferrite materials, such as Strontium hexaferrite, Barium hexaferrite etc have been largely studied in literature for microwave absorption properties (Tyagi et al 2010, Trukhanov et al 2017, Tyagi et al 2018. Due to high magnetic anisotropy, hexaferrite materials find applications in high frequency region.…”

Section: Introductionmentioning

confidence: 99%

Effect of neodymium doping on microwave absorption property of barium hexaferrite in X-band

Goel

Garg

Gupta

et al. 2020

Mater. Res. Express

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M-type barium hexaferrite (BaFe 12 O 19 ) particles are synthesized by using sol-gel auto-combustion reaction for microwave absorption study in X-band. Three different materials namely BaNd 0.02 Fe 11.98 O 19 (Nd2), BaNd 0.04 Fe 11.96 O 19 (Nd4) and BaNd 0.06 Fe 11.94 O 19 (Nd6) have been developed by varying doping of neodymium in barium hexaferrite. The synthesis of particles has been confirmed using SEM micrographs and XRD diffraction pattern. The hysteresis study is carried out for saturation magnetization using vibrating sample magnetometer (VSM). As the doping concentration of neodymium increases, the saturation magnetization of the material is decreased from 47.272 emu g −1 to 16.479 emu g −1 . The vector network analyzer (VNA) is used for complex permittivity and complex permeability measurements of the developed materials. Nd4 material shows highest values of permittivity and permeability losses among other developed materials. From the complex permittivity and complex permeability, the reflection loss results of the developed materials have been calculated. The maximum reflection loss of −33.17 dB was obtained for 2.2 mm pallet of BaNd 0.04 Fe 11.96 and −10 dB bandwidth reaches 2.94 GHz.

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“…Natural ferromagnetic resonance (NFMR) in M-type barium hexaferrite occurs in U-band (EHF range, 47-50 GHz) due to the anisotropy of the c-axis, and therefore, these materials can be used as microwave EMR absorbers [11][12][13]. Doping of barium hexaferrite with various diamagnetic ions (DI), such as Al 3+ , In 3+ , Ga 3+ , Co 2+ and Sc 3+ makes it possible to adapt the magnetic characteristics, and consequently, to control the range of operating frequencies up to 70 GHz [14][15][16][17][18][19][20]. As it was shown in [21], the transmission and absorption spectra of Ba(Fe 1−x DI x ) 12 O 19 demonstrate, depending on the substitution type and ratio, a change in the frequency and maximum absorption (associated with the NFMR) owing to a corresponding change in magnetocrystalline anisotropy (MCA).…”

Section: Introductionmentioning

confidence: 99%

Functional Magnetic Composites Based on Hexaferrites: Correlation of the Composition, Magnetic and High-Frequency Properties

et al. 2019

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The paper describes preparation features of functional composites based on ferrites, such as “Ba(Fe1−xGax)12O19/epoxy,” and the results of studying their systems; namely, the correlation between structure, magnetic properties and electromagnetic absorption characteristics. We demonstrated the strong mutual influence of the chemical compositions of magnetic fillers (Ba(Fe1−xGax)12O19 0.01 < x < 0.1 solid solutions), and the main magnetic (coercivity, magnetization, anisotropy field and the first anisotropy constant) and microwave (resonant frequency and amplitude) characteristics of functional composites with 30 wt.% of hexaferrite. The paper presents a correlation between the chemical compositions of composites and amplitude–frequency characteristics. Increase of Ga-content from x = 0 to 0.1 in Ba(Fe1−xGax)12O19/epoxy composites leads to increase of the resonant frequency from 51 to 54 GHz and absorption amplitude from −1.5 to −10.5 dB/mm. The ability to control the electromagnetic properties in these types of composites opens great prospects for their practical applications due to high absorption efficiency, and lower cost in comparison with pure ceramics oxides.

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Investigation into the structural features and microwave absorption of doped barium hexaferrites

Abstract: BaFe12−xGaxO19 hexaferrites were synthesized via the usual ceramic technology; with an increase in x, the unit cell and magnetic parameters monotonically decrease.

Cited by 139 publications

References 54 publications

Investigation of magnetoelectric effect in lead free K0.5Na0.5NbO3-BaFe12O19 novel composite system

Investigation of magnetoelectric effect in lead free K0.5Na0.5NbO3-BaFe12O19 novel composite system

Effect of neodymium doping on microwave absorption property of barium hexaferrite in X-band

Functional Magnetic Composites Based on Hexaferrites: Correlation of the Composition, Magnetic and High-Frequency Properties

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