Development and Characterization of Hexagonal Ferrite based Microwave Absorbing Paints at Ku-Band

Meshram, M R; Agrawal, N.K.; Sinha, Bharoti; Misra, P.S.

doi:10.1080/03772063.2001.11416236

Cited by 9 publications

(5 citation statements)

References 9 publications

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“…For reflection loss measurement, all the nanocrystals powder samples were 70% by weight mixed in Pu paint (98% paint with 2% hardener). The variation of reflection loss versus frequency was studied by absorber testing device, ATD [20][21].…”

Section: Characterization Studiesmentioning

confidence: 99%

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Microwave Absorption and Magnetic Studies of Strontium Hexaferrites Nanoparticles Synthesized by Modified Flux Method

Tyagi

Agarwala

2010

JNanoR

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M-type strontium hexaferrite nanocrystals of radar absorbing material (NRAM) i.e. SrFe12O19 were synthesized by modified flux method that combine the controlled chemical co-precipitation process for nucleation and complete uniform growth during annealing with NaCl flux. Uniform structural morphological transformation of nanocrystals from needle to hexagonal prism faces were noticed after annealing with increasing of heat treatment (HT) temperature from 800 to 1200°C for 4h. X-ray diffraction (XRD) results show the formation of various phases with increase in annealing temperature. The crystallinity and crystallite size are found to increase with increase in heat treatment temperature (15-40nm). The superparamagnetic behavior of strontium hexaferrite is confirmed by vibrating sample magnetometer (VSM) wherein it was noticed that magnetic field (10000 gauss max) did not have any effect on these materials. The transformation of magnetic properties i.e. from superparamagnetic to ferromagnetic behaviour after heating at various HT temperatures have been revealed by hysteresis loops under VSM study. The increase in saturation magnetization from 2.44 to 75.03 emu/gm is observed. Formation of ultrafine particles has been confirmed through field emission scanning electron microscope (FESEM). About 5 to10% of the needle like crystals in the ‘as synthesized’ condition were transformed to hexagonal pyramidal structure and most of the crystals are found to have plate like hexagonal structures with increase in heat treatment temperatures. The effect of such systematic morphological transformation of nanocrystals was observed in reflection loss properties in X band (8-12 GHz). The maximum reflection loss of -20.05, -24.31, -24.16, -25.22, -25.12, -24.01 dB at 8.1, 8.6, 9.2, 9.6, 10.7, and 12 GHz respectively are observed for the material heat treated at 1200°C. A significant increment from - 6.5 to -25.22 dB at 9.6 GHz in reflection loss (RL) is noticed due to symmetric morphological growth of RAM nanocrystal during annealing.

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Section: Characterization Studiesmentioning

confidence: 99%

“…Then reflected power with absorber coated aluminum plate is noted (P2). The difference between two powers (P 1 -P 2 ) gives the reflection loss by the material [20][21].…”

Section: Characterization Studiesmentioning

confidence: 99%

Microwave Absorption and Magnetic Studies of Strontium Hexaferrites Nanoparticles Synthesized by Modified Flux Method

Tyagi

Agarwala

2010

JNanoR

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“…2 measured by absorber testing device (ATD) method [2,7]. ATD is basically a pyramidal horn antenna, in which extended waveguide section is connected at the aperture of the horn antenna.…”

Section: Measurement Of Microwave Absorptionmentioning

confidence: 99%

“…And reflected power with an absorber plate is noted in the power meter. The difference between two readings gives the power absorbed by the absorber power [2,7].…”

Section: Measurement Of Microwave Absorptionmentioning

confidence: 99%

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Characterization of M-type barium hexagonal ferrite-based wide band microwave absorber

Meshram

Agrawal

Sinha

et al. 2004

Journal of Magnetism and Magnetic Materials

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100

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Empirical relationship between δ and ferromagnetic resonance frequency in hexagonal ferrite‐based microwave absorbing paint

Meshram

Agrawal

Sinha

et al. 2003

Micro & Optical Tech Letters

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Development and Characterization of Hexagonal Ferrite based Microwave Absorbing Paints at Ku-Band

Cited by 9 publications

References 9 publications

Microwave Absorption and Magnetic Studies of Strontium Hexaferrites Nanoparticles Synthesized by Modified Flux Method

Microwave Absorption and Magnetic Studies of Strontium Hexaferrites Nanoparticles Synthesized by Modified Flux Method

Characterization of M-type barium hexagonal ferrite-based wide band microwave absorber

Empirical relationship between δ and ferromagnetic resonance frequency in hexagonal ferrite‐based microwave absorbing paint

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