Characterization of Barium M-Hexaferrite with Doping Zn and Mn for Microwaves Absorbent

2019 ◽  
Vol 966 ◽  
pp. 282-289 ◽  
Author(s):  
Susilawati ◽  
Aris Doyan ◽  
Muhammad Taufik ◽  
Wahyudi ◽  
Eryn Ryantin Gunawan ◽  
...  
Keyword(s):  
Calcination Temperature ◽  
Ion Concentration ◽  
Magnetic Minerals ◽  
Natural Sand ◽  
Band Frequency ◽  
Absorbent Material ◽  
Electrical And Magnetic Properties ◽  
Magnetic Remanence ◽  
X Band

The research was conducted to examine the content of Fe and other metal in natural sand of beach Ampenan, Mataram, Indonesia which is expected to be used as microwave absorbent material. Characterizations of the electrical and magnetic properties Barium M-Hexaferrite (BaM) with Zn-Mn doping (BaFe12-2xZnxMnxO19) are biosynthesized. Research carried out among others tested the metal content of Fe and other metals, synthesize BaFe12-2xZnxMnxO19. The samples were characterized using Vibrating Sample Magnetometer (VSM) and Network Vector Analyzer (VNA) for the test properties of electricity and magnetism, as well as the absorption of microwaves. The results from the AAS (Atomic Absorption Spectroscopy) testing showed that each gram of magnetic minerals in the natural sand containing 16.27 mg Fe, which states that the majority of metal components content is 69.80% Fe metal with the Magnetite and Hematite phases. The result from VSM showed that the coercivity value decreased when doping ion concentration and calcination temperature increased (0.16 Tesla at 600°C for x = 0.0 and 0.09 Tesla at 800°C for x = 1.0). Value of magnetic saturation and the magnetic remanence decreased with increasing ion concentration (Ms= 4.94 emu/g at x = 0.0 decreased to 0.31 emu/g at x = 1.0) and Mr = 3.43 emu/g for x = 0.0 decreased to 0.06 emu/g at x=1.0. These indicates that the sample has been soft magnetic. The result from VNA showed that the electrical conductivity values measured in the range 8.0-15.0 GHz indicate that the sample is a semiconductor (1.62×10-2 S/cm). The result from VNA showed that the microwave absorption properties increased at higher concentration of doping ions and the calcination temperature would increase the value of Reflection Loss (RL). Maximum RL value of the sample is -14.37 dB at 15 GHz and the absorption coefficient of 96.34%. These results indicate that the BaFe10.8Zn0.6Mn0.6O19 sample can be applied as a microwave absorbent material on X-band to Ku- band frequency. Keyword: Characterization, Barium M-Hexaferrite, doping, microwave, absorbent.

Perfect metamaterial absorbers with polarization angle independency in X-band waveguide

2016 ◽  
Vol 30 (11) ◽  
pp. 1650186 ◽  
Author(s):  
Cumali Sabah
Keyword(s):  
Wireless Communication ◽  
Frequency Region ◽  
Polarization Angle ◽  
Perfect Absorption ◽  
Band Frequency ◽  
X Band ◽  
Resonance Frequencies ◽  
Metamaterial Absorbers ◽  
Space Boundary

The design and characterization of perfect metamaterial absorbers (MAs) based on simple configurations including square- and triangle-shapes, which operate in X-band frequency region are numerically and experimentally investigated. The proposed MAs provide perfect absorption with the polarization angle independency. In X-band waveguide, the absorption rates are 99.69% and 99.97% at the resonance frequencies of 10.57 GHz and 10.93 GHz for the square- and triangle-shaped MAs, respectively. In addition, the same configurations are numerically tested under free space boundary conditions to compare and discuss the obtained results. The suggested MAs enable myriad potential application areas for security and stealth technologies in X-band including wireless communication.

Microwave characterization of lanthanum iron garnet-filled PVDF-polymer composite using rectangular waveguide at X-band frequency

2012 ◽  
Vol 46 (12) ◽  
pp. 1497-1501 ◽  
Author(s):  
Hassan Soleimani ◽  
Zulkifly Abbas ◽  
Noorhana Yahya ◽  
Hojjatollah Soleimani ◽  
Mohammad Yeganeh Ghotbi
Keyword(s):  
Polymer Composite ◽  
Rectangular Waveguide ◽  
Band Frequency ◽  
Microwave Characterization ◽  
X Band ◽  
Iron Garnet

Characterization of BaM and PaNi-Based Radar Absorbency (RAM) Behavior with Multilayer Geometry Structure for X-Band Absorption

2019 ◽  
Vol 966 ◽  
pp. 54-59 ◽  
Author(s):  
Mochamad Zainuri ◽  
Dina Andryani
Keyword(s):  
Reflection Loss ◽  
Soft Magnetic Materials ◽  
X Ray Diffraction ◽  
Solid State Method ◽  
Band Frequency ◽  
X Ray ◽  
X Band ◽  
Band Absorption ◽  
Radar Wave

Behavioral characterization of radar absorbent material consisting of Polyaniline (PaNi) and Barium M-Hexaferrite (BaM) has been successfully synthesized by solid state method. Polyaniline conductive material was synthesized using the polymerization method with DBSA dopant. A Radar Absorbing Materials (RAM) is characterized by X-Ray Fluorescence (XRF), X-Ray Diffraction (XRD), Fourier Transform Infrared (FTIR), Four Point Probe (FPP), Scanning Electron Microscope (SEM) and Vector Network Analyzer (VNA). The ion Zn 2+ is dopping into the BAM structure, where Zn 2+ ions replace Fe2+ ions in Hexaferrite barium so that the phase becomes soft magnetic materials . RAM and PANi particles are combined with ship paint to form radar wave absorbent coatings. The layer is coated with multilayer geometry on AH 36 type A steel, with thicknesses of 2.4 mm, 3.6 mm, 4.8 mm and 6 mm respectively. The X-band wave absorption was identified by VNA testing, where the maximum reflection loss value was found at 6mm thickness with a reflection loss value - 32.6 dB at 8.4 GHz frequency. Reflection loss values of multilayer variations with a thickness of 2.4 mm, 3.6mm and 4.8mm each have reflection loss values of -8.02 dB, -19.13 dB and -28.9 dB respectively in the x band frequency range.

scholarly journals Electromagnetic Characterization of a Multiwalled Carbon Nanotubes–Silver Nanoparticles-Reinforced Polyvinyl Alcohol Hybrid Nanocomposite in X-Band Frequency

ACS Omega ◽  
2021 ◽  
Vol 6 (6) ◽  
pp. 4184-4191
Author(s):  
Yusliza Yusof ◽  
Seyedehmaryam Moosavi ◽  
Mohd Rafie Johan ◽  
Irfan Anjum Badruddin ◽  
Yasmin Abdul Wahab ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Silver Nanoparticles ◽  
Polyvinyl Alcohol ◽  
Multiwalled Carbon Nanotubes ◽  
Hybrid Nanocomposite ◽  
Multiwalled Carbon ◽  
Band Frequency ◽  
X Band

Synthesis and Characterization Barium M-Hexaferrites (BaFe12-2xCoxMnxNixO19) as a Microwave Absorbent Material

2021 ◽  
Vol 317 ◽  
pp. 46-52
Author(s):  
Susilawati Hambali ◽  
Aris Doyan
Keyword(s):  
Electron Microscope ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Band Frequency ◽  
Absorbent Material ◽  
Transmission Electron ◽  
X Band ◽  
Co Precipitation

This study aims to synthesize microwave absorbent material from barium M-Hexaferrite doped Co-Mn-Ni ions (BaFe12-2xCoxMnxNixO19) using co-precipitation method with varying concentrations (x = 0.2, 0.4, 0.6, 0.8, and 1.0) and calcinations temperatures in the range of 200 to 800°C. The samples characterization was conducted to investigate the effect of doping concentration variations on the electrical, magnetic and microwave absorption properties using X-Ray Diffraction (XRD), Scanning Electron Microscope (SEM-EDX), Transmission Electron Microscope (TEM), Vibrating Sample Magnetometer (VSM), and Network Vector Analyzer (VNA). The results from XRD characterization showed that the sample formed the barium iron oxide (BaFe12O19) phase with a = b = 5.03Å and c = 13.43Å. The results of SEM-EDX and TEM samples of BaFe9.6Co0.8Mn0.8Ni0.8O19 showed that the sample size ranged from 79-165 nm in the hexagonal crystal structure form. The magnetic properties with VSM indicate that the sample coercivity value decreases significantly from 0.41 T at x = 0.0 to 0.09 T at x = 0.8, indicating that the sample is soft magnetic. The value of electrical conductivity is in the range of 2.42 x 10-4 to 9.30 x 10-4 S/cm shows that the sample is a semiconductor. Analysis of the absorption properties of microwaves with VNA produced maximum permittivity and permeability values ​​of 28.40 and 54.40 at 10.30 GHz, and a maximum Reflection Loss (RL) value of -20.20 dB at a frequency of 15 GHz with an absorption coefficient of 99.05 % at concentration x = 0.6. The high permittivity, permeability, RL, and absorption coefficients indicate that the BaFe12-2xCoxMnxNixO19 sample has the potential to be a microwave absorbent material on X-band to Ku-band frequency.

Effect of Blowing Agent to the Dielectric Properties of Polyurethane-Empty Fruit Bunch Composite in X-Band Frequency

2020 ◽  
Vol 981 ◽  
pp. 169-175
Author(s):  
Syarifah Norsuhaila Syed Mahmud ◽  
Mohamad Ashry Jusoh ◽  
You Kok Yeow ◽  
Fahmiruddin Esa
Keyword(s):  
Dielectric Properties ◽  
Palm Oil ◽  
Dielectric Study ◽  
Network Analyzer ◽  
Empty Fruit Bunch ◽  
Band Frequency ◽  
Blowing Agent ◽  
Dielectric Constant And Loss ◽  
X Band

Nowadays, the usage of blowing agent in polyurethane preparation has been an essential enhance the characterization of polymers or composites material. The use of blowing agent may affect the properties of the materials and directly alter the performance of resulting product. In this paper, the effect of a blowing agent on dielectric properties of palm oil-based polyurethane (POlyOP) have been studied. The palm oil-based polyurethane ( POlyOP) has been prepared using the presence of water act as a blowing agent and tegostab 8486 act as a surfactant. The Oil Palm Empty Fruit Bunch (EFB) was used in the composite as filler. The dielectric constant and loss factor analysis in this study was carried out by Vector Network Analyzer (VNA) at x-band frequency using Nicholson-Ross-Weir (NRW) technique. The dielectric study of PolyOP composite showed that the presence of blowing agent in composite enhance the value of dielectric properties of composite at x-band frequencies.

scholarly journals Experimental demonstration of novel beam characterization using a polarizable X-band transverse deflection structure

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
B. Marchetti ◽  
A. Grudiev ◽  
P. Craievich ◽  
R. Assmann ◽  
H.-H. Braun ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Frequency Range ◽  
Charge Density Distribution ◽  
Band Frequency ◽  
Full Control ◽  
X Band ◽  
Beam Characterization ◽  
Dimensional Reconstruction ◽  
Transverse Deflection

AbstractThe PolariX TDS (Polarizable X-Band Transverse Deflection Structure) is an innovative TDS-design operating in the X-band frequency-range. The design gives full control of the streaking plane, which can be tuned in order to characterize the projections of the beam distribution onto arbitrary transverse axes. This novel feature opens up new opportunities for detailed characterization of the electron beam. In this paper we present first measurements of the Polarix TDS at the FLASHForward beamline at DESY, including three-dimensional reconstruction of the charge-density distribution of the bunch and slice emittance measurements in both transverse directions. The experimental results open the path toward novel and more extensive beam characterization in the direction of multi-dimensional-beam-phase-space reconstruction.

AEM analysis of crystallization in Ti-based amorphous alloys

1983 ◽  
Vol 41 ◽  
pp. 270-271
Author(s):  
A.R. Pelton ◽  
A.F. Marshall ◽  
Y.S. Lee
Keyword(s):  
Magnetic Properties ◽  
Amorphous Alloys ◽  
Amorphous Materials ◽  
Isothermal Annealing ◽  
Amorphous Matrix ◽  
Nucleation And Growth ◽  
Current Interest ◽  
Amorphous Films ◽  
Electrical And Magnetic Properties

Amorphous materials are of current interest due to their desirable mechanical, electrical and magnetic properties. Furthermore, crystallizing amorphous alloys provides an avenue for discerning sequential and competitive phases thus allowing access to otherwise inaccessible crystalline structures. Previous studies have shown the benefits of using AEM to determine crystal structures and compositions of partially crystallized alloys. The present paper will discuss the AEM characterization of crystallized Cu-Ti and Ni-Ti amorphous films.Cu60Ti40: The amorphous alloy Cu60Ti40, when continuously heated, forms a simple intermediate, macrocrystalline phase which then transforms to the ordered, equilibrium Cu3Ti2 phase. However, contrary to what one would expect from kinetic considerations, isothermal annealing below the isochronal crystallization temperature results in direct nucleation and growth of Cu3Ti2 from the amorphous matrix.

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