Dielectric constant, magnetic permeability and microwave absorption studies of hot-pressed Ba-CoTi hexaferrite composites in X-band

Singh, Praveen; Babbar, V. K.; Razdan, Archana; Srivastava, Shivani; Agrawal, Veena; Goel, T. C.

doi:10.1007/s10853-006-0921-y

Cited by 59 publications

(27 citation statements)

References 16 publications

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“…The reduction of electromagnetic backscatter with the use of microwave absorbing material (MAM) has important applications in the field of radar and electromagnetic compatibility (Singh et al 2006;Qiu et al 2007). Carbon materials, which are considered as the most promising absorbent since World War II, has been widely employed in microwave absorbing materials in reducing backscattering from objects or radar targets, EMI suppressors and paints (Xie et al 2005;Zhang and Zhu 2009).…”

Section: Introductionmentioning

confidence: 99%

Microwave absorbing properties of activated carbon fibre polymer composites

et al. 2011

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Microwave absorption of composites containing activated carbon fibres (ACFs) was investigated. The results show that the absorptivity greatly depends on increasing ACF content in the absorbing layer, first increasing and then decreasing. When the content is 0·76 wt.%, the bandwidth below −10dB is 12·2 GHz. Comparing the absorption characteristics of the ACF composite with one containing unactivated fibres, it is found that carbon fibre activation increases the absorption of the composite.

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Section: Introductionmentioning

confidence: 99%

Microwave absorbing properties of activated carbon fibre polymer composites

et al. 2011

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“…properties, corrosion resistance, chemical stability, and high performance-to-cost ratio. It has been recognized that they can be used as permanent magnets and high-density magnetic reordering media; they can also be used in telecommunication and as components in microwaves, higher frequencies, and magnetooptical devices [1][2][3][4]. The purity, size, and morphology of the powders affect its magnetic properties [5].…”

Section: Introductionmentioning

confidence: 99%

Erratum to: Microstructure and Magnetic Properties of SrFe12O19 Nano-sized Powders Prepared by Sol-Gel Auto-combustion Method with CTAB Surfactant

Mirkazemi

Alamolhoda

Ghiami

2015

J Supercond Nov Magn

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In this research, nano-sized powders of strontium hexaferrite were synthesized by sol-gel auto-combustion route using stoichiometric ratio of Fe/Sr. The effect cetyltrimethylammonium bromide (CTAB) addition on microstructure and magnetic properties of hexaferrite have been studied. The samples were characterized using X-ray diffraction (XRD), dynamic light scattering (DLS), vibration sample magnetometer (VSM), field emission scanning electron microscope (FESEM), and transmission electron microscope (TEM) techniques. The results revealed that CTAB addition causes a noticeable reduction in the amount of residual α-Fe 2 O 3 phase, since presence of CTAB in the sol facilitates the entrance of Sr 2+ ions into the reactions of hexaferrite formation. Also, the morphology of the particles was affected by CTAB addition. Irregular-shaped nanoparticles were synthesized without CTAB additions, while platelet-shaped nanoparticles were obtained by CTAB addition. The mechanism of strontium hexaferrite nanopowder formation has been explained. Magnetic measurements in the sample calcined at 800°C for 1 h represented that CTAB addition increased the coercivity force ( i H c ) from 4.9 to 5.2 kOe and maximum magnetization (M max ) from 48.4 to 60.4 emu/g, respectively.The online version of the original article can be found at http:// dx

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“…These EMI problems have been attracting more attention over military and civilian spheres due to the extensive growth in electric components [2]. All types of electrical components are subjected to the EM interference induced by electric and magnetic fields, therefore, microwave absorbers are the focus of extensive study.…”

Section: Introductionmentioning

confidence: 99%

“…It is observed that material composition and particle morphology play a major role in absorption behavior. [2,[9][10][11][12][13], but the effect of particle size is still under research and very less attention has been given to observe the effect of particle size on absorption at microwave frequencies. The particle morphology and particle size are influenced by heat treatment [7,8].…”

Section: Introductionmentioning

confidence: 99%

EFFECT OF PARTICLE SIZE OF BaFe<sub>12</sub>O<sub>19</sub> ON THE MICROWAVE ABSORPTION CHARACTERISTICS IN X-BAND

Kumar¹,

Agarwala²,

Singh³

2013

PIER M

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Abstract-Present work deals with the microwave absorption characteristics of BaFe 12 O 19 of interest as radar absorbing material (RAM). There are very few reported works available where particle size has been critically analyzed for absorbing characteristics at microwave frequencies, therefore, in this paper microwave absorption properties of the BaFe 12 O 19 with different particle sizes were investigated. The results showed that the particle size had significant influence on the dielectric and absorption properties of the composites in the 8.2-12.4 GHz frequency range. BaFe 12 O 19 powder of different particle sizes were synthesized by varying the annealing time and it was observed that the real part of permittivity of the composite increases from 5.18 (average value) to 7.50 (average value) and imaginary part increases from an average value of 0.20 to an average value of 2.33, whereas the real part of permeability increases from 0.95 (average value) to 1.11 (average value) and imaginary part of permeability was measured in the range of 0.02 to 0.07. These changes in permittivity and permeability affects microwave absorption application. It is observed that the maximum bandwidth for average particle size of 240 nm is 3.02 GHz and with the increase in average particle size, microwave absorption properties increased.

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Dielectric constant, magnetic permeability and microwave absorption studies of hot-pressed Ba-CoTi hexaferrite composites in X-band

Cited by 59 publications

References 16 publications

Microwave absorbing properties of activated carbon fibre polymer composites

Microwave absorbing properties of activated carbon fibre polymer composites

Erratum to: Microstructure and Magnetic Properties of SrFe12O19 Nano-sized Powders Prepared by Sol-Gel Auto-combustion Method with CTAB Surfactant

EFFECT OF PARTICLE SIZE OF BaFe<sub>12</sub>O<sub>19</sub> ON THE MICROWAVE ABSORPTION CHARACTERISTICS IN X-BAND

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