Tunable microwave absorption in Co Al substituted M-type Ba Sr hexagonal ferrite

Singh, Jasbir; Singh, Charanjeet; Kaur, Dalveer; Narang, Sukhleen Bindra; Joshi, R. V.; Mishra, Sanjay R.; Jotania, Rajshree B.; Ghimire, Madhav; Chauhan, Chetna C.

doi:10.1016/j.matdes.2016.08.049

Cited by 91 publications

(14 citation statements)

References 32 publications

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“…The results exhibit that the maximum reflection loss was blue shifted when the absorber thickness was diminished, correlated by the quarter wavelength mechanism calculated by

t_{m} = \frac{nc}{4 \sqrt{(||, {normalε}_{r}) (||, {normalμ}_{r})} f_{m}}

equation where n , t m , and f m are the odd number, matching thickness, and frequency . According to this theory, when the thickness of the microwave‐absorbing sample was an odd numeral coefficient of λ/4 of the incident waves, the reflected waves of the interfaces having 180° out of phase with the input waves act as destroyer reversal waves . It is clear that reinforcing permittivity and permeability lead to diminish t m of the absorber.…”

Section: Resultsmentioning

confidence: 99%

Novel, promising, and broadband microwave‐absorbing nanocomposite based on the graphite‐like carbon nitride/CuS

Peymanfar

Karimi²,

Fallahi³

2019

J of Applied Polymer Sci

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In this study, a broadband, intense, novel, and promising microwave-absorbing nanocomposite was prepared using graphite-like carbon nitride (g-C 3 N 4 )/CuS suspended in poly(methyl methacrylate) (PMMA) medium. The g-C 3 N 4 nanosheets were synthesized by heating the urea as well as the CuS nanoparticles, and g-C 3 N 4 /CuS nanocomposites were prepared using a solvothermal method and then were separately molded by a PMMA solution to investigate their microwave-absorbing characteristics. The Fourier transform infrared and X-ray powder diffraction were used to characterize the g-C 3 N 4 , CuS, and CuS/g-C 3 N 4 nanostructures, which confirmed that the pure structure of the nanomaterials has been synthesized. The optical properties of the nanostructures were also investigated by diffuse reflection spectroscopy analysis. Accordingly, the Kubelka-Munk theory suggested significant narrow band gap for g-C 3 N 4 /CuS nanocomposite (0.27 eV), facilitating electron jumping and conductive loss. The morphology of the structures was examined using field emission scanning electron microscopy micrographs, illustrating that the uniform hexagonal structures of the CuS nanoplates have been formed and the CuS two-dimensional structures were uniformly distributed on the g-C 3 N 4 nanosheets. Finally, the microwave-absorbing properties of the CuS, g-C 3 N 4 , and g-C 3 N 4 /CuS were investigated by PMMA as a host. The microwaveabsorbing properties were evaluated using a vector network analyzer. The results illustrated that the maximum reflection loss of the g-C 3 N 4 /PMMA nanocomposite was −71.05 dB at 14.90 GHz with a thickness of 2.00 mm, demonstrating a 1.70 GHz bandwidth >30 dB, as well as g-C 3 N 4 /CuS/PMMA nanocomposite absorbed 7.30 GHz bandwidth of more than 10 dB with a thickness of 1.80 mm along the x-and ku-band frequency. The obtained results introduced the PMMA as a capable microwave-absorbing substrate. Besides, the g-C 3 N 4 /CuS/PMMA nanocomposite demonstrated metamaterial property and abundant attenuation constant.

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“…The results exhibit that the maximum reflection loss was blue shifted when the absorber thickness was diminished, correlated by the quarter wavelength mechanism calculated by

t_{m} = \frac{nc}{4 \sqrt{(||, {normalε}_{r}) (||, {normalμ}_{r})} f_{m}}

Section: Resultsmentioning

confidence: 99%

Novel, promising, and broadband microwave‐absorbing nanocomposite based on the graphite‐like carbon nitride/CuS

Peymanfar

Karimi²,

Fallahi³

2019

J of Applied Polymer Sci

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“…Barium hexaferrite powders are ideally suited fillers for the development of electromagnetic attenuation materials at microwave frequencies, due to their low cost, low density, high stability, large electrical resistivity, and high microwave magnetic loss. Thus, they find applications as electromagnetic emission absorber materials [7,8,9,10,11,12,13,14,15]. …”

Section: Introductionmentioning

confidence: 99%

Magnetic and Structural Properties of Barium Hexaferrite BaFe12O19 from Various Growth Techniques

et al. 2017

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Barium hexaferrite powder samples with grains in the μm-range were obtained from solid-state sintering, and crystals with sizes up to 5 mm grown from PbO, Na2CO3, and BaB2O4 fluxes, respectively. Carbonate and borate fluxes provide the largest and structurally best crystals at significantly lower growth temperatures of 1533 K compared to flux-free synthesis (1623 K). The maximum synthesis temperature can be further reduced by the application of PbO-containing fluxes (down to 1223 K upon use of 80 at % PbO), however, Pb-substituted crystals Ba1–xPbxFe12O19 with Pb contents in the range of 0.23(2) ≤ x ≤ 0.80(2) form, depending on growth temperature and flux PbO content. The degree of Pb-substitution has only a minor influence on unit cell and magnetic parameters, although the values for Curie temperature, saturation magnetization, as well as the coercivity of these samples are significantly reduced in comparison with those from samples obtained from the other fluxes. Due to the lowest level of impurities, the samples from carbonate flux show superior quality compared to materials obtained using other methods.

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“…To eliminate the EMI is required a magnetic material which able to resonate at a specific frequency that is expected to absorb electromagnetic radiation is undesirable. Recently electromagnetic absorbing materials are being developed is the modification of ferrite-based magnetic materials because it has a high permeability relatively [3][4][5][6][7][8][9][10]. The problem faced in a ferrite-based magnetic material that will be the object of this study is the magnetocrystalline anisotropy constant of this compound has relatively high value of ~ 330 kJ/m 3 .…”

Section: Introductionmentioning

confidence: 99%

EFFECT OF Mn AND Ti ADDITION ON THE CRYSTALLOGRAPHIC STRUCTURE AND MAGNETIC PROPERTIES OF SrFe12O19

et al. 2020

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The synthesis and characterization of composition SrFe12-(x+y)MnxTiyO19 (x = y and x ≠ y) compound by using solid state reaction have been performed. The raw materials were SrCO3, Fe2O3, MnCO3, and TiO2. The mixed powder was compacted at 5000 psi into pellets and sintered at 1050°C in the air at atmosphere pressure for 15 hours and furnace cooling. The refinement results of x-ray diffraction pattern show that the doping composition (x = y) was a single phase while the doping composition (x ≠ y) was multi phase. We concluded that effect of substitution upon magnetic properties revealed that total magnetization, remanence and coercivity changed with substitution due to preferential site occupancy of substituted Mn2+ and Ti4+ ions. The coercivity decreases with increase in Mn and Ti concentration. This effect is related with Fe3+ magnetic moment changes after they have already substituted Mn2+ and Ti4+ ions. Since the coercivity and total magnetization may be controlled by substitution while maintaining resistive properties, making this material useful for microwave absorber.

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Tunable microwave absorption in Co Al substituted M-type Ba Sr hexagonal ferrite

Cited by 91 publications

References 32 publications

Novel, promising, and broadband microwave‐absorbing nanocomposite based on the graphite‐like carbon nitride/CuS

Novel, promising, and broadband microwave‐absorbing nanocomposite based on the graphite‐like carbon nitride/CuS

Magnetic and Structural Properties of Barium Hexaferrite BaFe12O19 from Various Growth Techniques

EFFECT OF Mn AND Ti ADDITION ON THE CRYSTALLOGRAPHIC STRUCTURE AND MAGNETIC PROPERTIES OF SrFe12O19

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