Microwave characteristics of low density hollow glass microspheres plated with Ni thin-film

Liu, Z. W.; Phua, L.X.; Liu, Y.; Ong, C. K.

doi:10.1063/1.2358824

Cited by 37 publications

(17 citation statements)

References 14 publications

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“…No α-BaFe 2 O 4 , γ-Fe2O3, or any other ferrite intermediate was observed during the formation that indicated the direct formation of single phase BaFe 16 O 27 hexaferrite nanocrystals. With increasing annealing temperature the surface morphologies is changing and crystallanity is increasing continuously.…”

Section: Discussionmentioning

confidence: 99%

“…In general, the suitable values of RAM can be achieved by adding lossy fillers and/or magnetic particles to a light weight that are physically and chemically stable one and of course have a high ability to absorb electromagnetic wave radiation [7][8][9][10]. The composite approach has been used to improve various material properties, including mechanical, chemical, structural, optical and electrical/magnetic etc [11][12][13][14][15][16][17]. …”

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confidence: 99%

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Development of Radar Absorbing Nano Crystals under Thermal Irradiation

Sharma

Agarwala

2008

JNanoR

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) were synthesized by a modified flux method that combines the controlled chemical co-precipitation process for nucleation and complete uniform growth during in-situ annealing with NaCl flux under vacuum furnace. Uniform structure morphological transformation of nano crystals from spherical to prism faces were noticed after annealing with increasing temperatures from 200 to 1200 o C for 4 h in vacuum. XRD results showed the single phase nanocrystals of BaFe 18 O 27 with increasing crystallanity and size from 10 to 90 nm during annealing. FESEM and TEM were used to investigate the systematic growth processes of various morphologies of nano crystals. The effect of such systematic morphological transformation of nanocrystals was observed in dielectric, dynamic magnetic and refection loss (RL) properties in Kuband (12.4 -18.0 GHz). A significant increment from -15.23 dB to -43.65 dB with wide range of bandwidth in RL loss is noticed due to the symmetric morphological growth of single phase nano crystals of RAM during annealing. This process of crystal growth, morphology evolution and RL enhancement with respect to increasing temperature were also explained in terms of ostwald ripening and quantum size effect. IntroductionThe electromagnetic interference (EMI) problems have been attracting more attention recently due to the extensive growth in the application of electronic devices such as computer local area networks, mobiles phones, laptops, microwave oven etc [1][2][3]. EMI can cause severe interruption on electronically controlled systems. Furthermore, larger exposure to microwave energy can be potentially harmful to biological systems and human beings. To overcome EMI problems, it is suggested that electromagnetic wave absorbing materials with the capability of absorbing unwanted electromagnetic signals are to be used. For significant absorption of electromagnetic waves, the radar absorption material (RAM) should have electric and/or magnetic dipoles that interact with the electromagnetic fields in the radiation. Microwave absorption materials from magnetic to dielectric related materials used in a high frequency are particularly noticed. But, pure dielectric or magnetic materials are insufficient for absorbing radiation energy. The efficiency of magnetic-dielectric absorbers is high because the complex permittivity (ε΄-jε˝) and permeability (µ΄-jµ˝) differ from zero [4][5][6]. In general, the suitable values of RAM can be achieved by adding lossy fillers and/or magnetic particles to a light weight that are physically and chemically stable one and of course have a high ability to absorb electromagnetic wave radiation [7][8][9][10]. The composite approach has been used to improve various material properties, including mechanical, chemical, structural, optical and electrical/magnetic etc [11][12][13][14][15][16][17].

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Section: Discussionmentioning

confidence: 99%

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confidence: 99%

Development of Radar Absorbing Nano Crystals under Thermal Irradiation

Sharma

Agarwala

2008

JNanoR

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“…As thickness of composite layer increases, the peak of RL is moving to lower frequency and becomes narrower. For Ni-Co-P hollow spheres, the maximum attenuation of the incident wave is observed for sample 4 with a thickness of 2.5 mm, and the value of the peak is −41.7 dB, which is better than those of hollow structure of nickel [7,12,13]. Fig.…”

Section: Resultsmentioning

confidence: 90%

“…As one of ways to overcome this problem, microwave absorptive materials with low density have been developed [7][8][9][10][11]. Magnetic hollow powder is one of materials with low density used as microwave absorber.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization and microwave properties of Ni–Co–P hollow spheres

Deng

Shen

et al. 2010

Journal of Alloys and Compounds

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“…Further, composite approach has been used to improve various material properties, including mechanical, chemical, structural, optical and electrical/magnetic etc. Modifying the properties of one material by coating it with another type of material has been a popular approach widely documented in the literature [21][22][23][24][25][26]. Tang et al [21] has investigated the effect of microwave absorption properties of titania-coated M-type barium ferrite composite powder in the frequency range of 2-20 GHz.…”

Section: Introductionmentioning

confidence: 99%