Effect of Mg Substitution on Microwave Absorption of BaFe&lt;sub&gt;12&lt;/sub&gt;O&lt;sub&gt;19&lt;/sub&gt;

Kumar, Abhishek; Agarwala, Vijaya; Singh, Dharmendra

doi:10.4028/www.scientific.net/amr.585.62

Cited by 18 publications

(5 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In multi-layer composites, the number of layers produces attenuation. Impedance matching is another important factor which increases as the depth of penetration of increases [3].…”

Section: Mechanisms Involved In Microwave Absorptionmentioning

confidence: 99%

Recent developments in RAM based MWCNT composite materials: a short review

Yeswanth

Jha

Bhowmik

et al. 2022

Funct. Compos. Struct.

View full text Add to dashboard Cite

The need of developing Radar absorbing materials which meet the structural requirement of Defense applications is growing swiftly due to extensive use of electromagnetic (EM) waves in Radars. With major development and extensive use of Radar in military applications, the role of Radar absorbing structures with light weight and high strength has become prime objective for researcher working on development of Radar absorbing materials. Various composites are developed by using reinforcements which are dielectric such as CNT, Magnetic materials like Ferrites, have been extensively used as reinforcement in developing Radar absorbing materials. The ferromagnetic materials have high density and can achieve only narrow bandwidth absorption, CNT have very good electrical, mechanical and thermal properties and can achieve high dielectric losses but its complex synthesis process is a barrier in commercial applications. The research of reinforcing MWCNT with ferrites and metal oxides can also be extend to study thermoplastic polymers like PEEK and PAEK which is gaining prominence in aeronautical applications owing to its superior mechanical and low moisture absorbing properties. Further research can be done on the reinforcing metal oxides as metal oxides when reinforced with MWCNT proved to enhance the dielectric properties which improved the reflection losses as reported in a few studies.

show abstract

“…In multi-layer composites, the number of layers produces attenuation. Impedance matching is another important factor which increases as the depth of penetration of increases [3].…”

Section: Mechanisms Involved In Microwave Absorptionmentioning

confidence: 99%

Recent developments in RAM based MWCNT composite materials: a short review

Yeswanth

Jha

Bhowmik

et al. 2022

Funct. Compos. Struct.

View full text Add to dashboard Cite

show abstract

“…The dielectric properties of BFO for different doping ions such as Al, La, Ni, Ti, and Dy have been reported in several studies. [ 12,15–17,40 ] The dielectric constant

ϵ'

is enhanced if the doping concentration of Bi [ 41 ] and Ti [ 16 ] increases, whereas

ϵ'

decreases for doping with La, Ni, Al, and Mg. [ 15,17,40,42 ] The reason for such a different behavior is an open problem. The size dependence of

ϵ'

in BFO is reported by Kumar et al [ 43 ] The bandgap of BFO NPs for different doping ions has been studied elsewhere.…”

Section: Introductionmentioning

confidence: 99%

Multiferroic Properties of Pure, Transition‐Metal and Rare‐Earth–Doped BaFe₁₂O₁₉ Nanoparticles

Apostolova

Apostolov

Trimper

et al. 2021

Physica Status Solidi (b)

View full text Add to dashboard Cite

Different properties of pure and Ni, Zr, and Sm‐doped BaFe12O19—bulk and nanoparticles—are investigated using a microscopic model and the Green's function technique. The magnetization Mnormals increases whereas the coercive field Hnormalc decreases with increasing particle size. The doping leads to a decrease of Ms and the bandgap energy Eg with increasing Zr concentration x due to tensile strain and to an increase of Ms and Eg after Ni doping due to compressive strain as well as due to size effects. The behavior of the spontaneous polarization Ps and the real part ϵ′ of the dielectric constant is opposite. The ϵ′ of a pure BaFe12normalO19 nanoparticle decreases with increasing magnetic field h. The effects of Sm substitution at Ba or Fe sites on ϵ′ and Ms are also studied.

show abstract

“…The importance of microwave absorbing materials in the modern society has prompted the researchers to develop high-performance microwave absorbers with characteristic features of high absorption, wider bandwidth, low density and less thickness 1 . Different approaches to develop microwave absorbers have been tried such as variation in particle size of absorber 2 , doping 3 , process parameters 4,5 , secondary phase dispersion 6,7 , multi layering 8 and implementation of frequency selective surfaces 9 . Since its inception, ceramics and ferrites based composite materials have been extensively used as microwave absorbing materials.…”

Section: Introductionmentioning

confidence: 99%

Selection of Core shell Material based Electromagnetic Wave Absorbers in 2 to18 GHz using TOPSIS and VIKOR Ranking Methods

Singh¹,

Kumar²

2019

Def. Sc. Jl.

Self Cite

View full text Add to dashboard Cite

Electromagnetic (EM) wave has become an integral part of this electronics dominated era with extensive application in wireless communication, health care, and military applications. This has led to the development of EM wave absorbers for camouflaging the military warheads from the enemy radar tracking systems. The development of these absorbers requires considerable resources viz. time, energy, raw materials and cost. This creates a need for selection of a better absorber from the existing ones rather than the development of a new one to save the valuable resources. The judicious selection of an efficient microwave absorber requires ranking the existing absorbers based on selection criteria. For the first time, an attempt has been made to apply the concept of multi-criteria decisionmaking methods viz. VIKOR and TOPSIS in ranking the microwave absorbers. Core-shell materials provides enhanced EM wave attenuation owing to their hierarchical composite structure which provides a better approach to tune the dielectric and magnetic properties of the composite for obtaining good impedance matching resulting into enhanced absorption. In the present work, magnitude of minimum reflection co-efficient value, absorber thickness, deviation from the central frequency (i.e. 10 GHz) and -10 dB bandwidth have been selected as the criteria for judiciously selecting suitable core-shell based EM wave absorbers in 2-18 GHz. The selected criterion has been assigned distinct weights using Analytic Hierarchy Process (AHP). The AHP derived weights have been employed in TOPSIS and VIKOR analysis for the absorbers ranking and selection.

show abstract

Effect of Mg Substitution on Microwave Absorption of BaFe<sub>12</sub>O<sub>19</sub>

Cited by 18 publications

References 9 publications

Recent developments in RAM based MWCNT composite materials: a short review

Recent developments in RAM based MWCNT composite materials: a short review

Multiferroic Properties of Pure, Transition‐Metal and Rare‐Earth–Doped BaFe₁₂O₁₉ Nanoparticles

Selection of Core shell Material based Electromagnetic Wave Absorbers in 2 to18 GHz using TOPSIS and VIKOR Ranking Methods

Contact Info

Product

Resources

About

Effect of Mg Substitution on Microwave Absorption of BaFe<sub>12</sub>O<sub>19</sub>

Cited by 18 publications

References 9 publications

Recent developments in RAM based MWCNT composite materials: a short review

Recent developments in RAM based MWCNT composite materials: a short review

Multiferroic Properties of Pure, Transition‐Metal and Rare‐Earth–Doped BaFe12O19 Nanoparticles

Selection of Core shell Material based Electromagnetic Wave Absorbers in 2 to18 GHz using TOPSIS and VIKOR Ranking Methods

Contact Info

Product

Resources

About

Multiferroic Properties of Pure, Transition‐Metal and Rare‐Earth–Doped BaFe₁₂O₁₉ Nanoparticles