scholarly journals Preparation and microwave absorbing properties in the X-band of natural ferrites from iron sands by high energy milling

2018 ◽  
Vol 5 (1) ◽  
pp. 014003 ◽  
Author(s):  
X Mashuri ◽  
W Lestari ◽  
X Triwikantoro ◽  
X Darminto
Keyword(s):  
High Energy ◽  
Microwave Absorbing Properties ◽  
High Energy Milling ◽  
X Band ◽  
Microwave Absorbing

scholarly journals Structural, Magnetic, and X-Band Microwave Absorbing Properties of Ni-Ferrites Prepared Using Oxidized Mill Scales

2021 ◽  
Vol 21 (1) ◽  
pp. 27
Author(s):  
Ardita Septiani ◽  
Novrita Idayanti ◽  
Tony Kristiantoro ◽  
Dedi Mada ◽  
Nadya Larasati Kartika ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Single Phase ◽  
Raw Materials ◽  
Energy Dispersive Spectrometer ◽  
Milling Process ◽  
Microwave Properties ◽  
Heating Process ◽  
Microwave Absorbing Properties ◽  
X Band ◽  
Microwave Absorbing

This study aims to evaluate the structural, magnetic, and microwave absorbing properties at the X-band region of oxidized mill scales as by-product derived from a steel making process by means of a facile solid-state reaction. The oxidized mill scales were heated at 600 °C for 4 h followed by mixing with NiO. A calcination process took place at 900 °C and sintering process were conducted at 1260 °C with a milling process conducted in between the heating process. X-ray diffraction (XRD) and scanning electron microscope (SEM) equipped with energy dispersive spectrometer (EDS) were employed to evaluate the structural properties of the Ni-ferrites samples. Remacomp measurement were conducted to evaluate the magnetic properties and vector network analyzer (VNA) to measure its microwave properties. A single phase of NiFe2O4 was confirmed by XRD data. The site occupancies derived from the Rietveld refinement shows that the Ni:Fe:O ratio deviates from the 1:2:4 ratio as that suggests vacancies formed in the Ni2+ and Fe3+ that lowers the unit cell density to 5.08 g/cm3 that further confirmed by EDS measurement. The coercivity of 11 kOe is also higher than the bulk NiFe2O4¬ prepared by the chemical grade raw materials. The reflection data of the microwave properties at X-band of 8-12 GHz do not shows significant absorptions. This study suggests that the selected preparation method yields a single phase, however with the significant crystallographic defects and has less ‘soft’ magnetic properties compared to NiFe2O4 prepared using chemical grade by previous study.

Effect of High-Energy Ball Milling on Microstructure and Microwave Absorbing Properties of NdFe Material

2011 ◽  
Vol 311-313 ◽  
pp. 1281-1285 ◽  
Author(s):  
Pei Hao Lin ◽  
Lei Wang ◽  
Shun Kang Pan ◽  
Hua Mei Wan
Keyword(s):  
Ball Milling ◽  
Particle Morphology ◽  
High Energy ◽  
High Energy Ball Milling ◽  
X Ray ◽  
Microwave Absorbing Properties ◽  
Absorbing Materials ◽  
Milling Method ◽  
Energy Ball ◽  
Microwave Absorbing

The NdFe magnetic absorbing materials were prepared by rapid solidification and high-energy ball milling method. The effect of high-energy ball milling on particle morphology, organizational structure and microwave absorbing properties of NdFe magnetic absorbing materials were analyzed with the aid of X-ray diffractometer, scanning electron microscope and vector network analysis. The results show that the Nd2Fe17 and α-Fe phase are refined, the particles become smaller and thinner; the span-ratio of the particles increases along with time during the process of high-energy ball milling; and meanwhile, the frequency of absorbing peak reduces. The absorbing bandwidth broadens as the increase of the time of ball milling, except that of 48h.The minimum reflectance of the powder decreases from -22dB to - 44dB under the circumstances that the time of high energy ball milling reaches 48h and the thickness of the microwave absorbing coating is 1.5mm. But it rebounds to about - 6dB when the time of ball milling reaches 72h.

scholarly journals Synthesis of suitable material for microwave absorbing properties in X-band

2020 ◽  
Vol 2 (12) ◽  
Author(s):  
Monika Rani ◽  
Kamaljit Singh Bhatia ◽  
Harjitpal Singh ◽  
Harsimrat Kaur ◽  
Nancy Gupta
Keyword(s):  
Suitable Material ◽  
Microwave Absorbing Properties ◽  
X Band ◽  
Microwave Absorbing

Microwave absorbing properties of iron nanowire at x-band frequencies

2011 ◽  
Vol 109 (7) ◽  
pp. 07B527 ◽  
Author(s):  
Ruey-Bin Yang ◽  
Wen-Fan Liang ◽  
Wei-Syuan Lin ◽  
Hong-Ming Lin ◽  
Chien-Yie Tsay ◽  
...  
Keyword(s):  
Microwave Absorbing Properties ◽  
X Band ◽  
Microwave Absorbing

X-band dielectric and microwave-absorbing properties of the incompletely carbonized polyacrylonitrile cloth

2012 ◽  
Vol 129 (3) ◽  
pp. 1068-1073 ◽  
Author(s):  
Zhibin Huang ◽  
Wenbo Kang ◽  
Xiufeng Tang ◽  
Yuchang Qing ◽  
Fa Luo
Keyword(s):  
Microwave Absorbing Properties ◽  
X Band ◽  
Microwave Absorbing

Sr hexaferrite/Ni ferrite nanocomposites: Magnetic behavior and microwave absorbing properties in the X-band

2015 ◽  
Vol 157 ◽  
pp. 124-129 ◽  
Author(s):  
Silvia E. Jacobo ◽  
Paula G. Bercoff ◽  
Carlos A. Herme ◽  
Leandro A. Vives
Keyword(s):  
Magnetic Behavior ◽  
Microwave Absorbing Properties ◽  
X Band ◽  
Microwave Absorbing

Microwave Absorbing Characteristics of Plasma Sprayed SiC-CNTs/AT13 Absorbing Coating

2016 ◽  
Vol 723 ◽  
pp. 512-516
Author(s):  
Gu Liu ◽  
Liu Ying Wang ◽  
Chao Qun Ge ◽  
Wei Wang ◽  
Zhang Juan Wei
Keyword(s):  
Reflection Loss ◽  
High Energy ◽  
Network Analyzer ◽  
Microwave Absorbing Properties ◽  
Spray System ◽  
Microwave Absorbing ◽  
Plasma Sprayed ◽  
Plasma Spraying Process ◽  
Spraying Process ◽  
Minimum Reflection Loss

Electromagnetic parameters of ultra-fine SiC, SiC whisker and nanometer SiC were tested to evaluate the microwave absorbing properties. Optimized nanometer SiC-CNTs/AT13 composite was fabricated by high energy mechanical commixture. Nanometer SiC-CNTs/AT13 absorbing coating was prepared by multi-functional micro-plasma spray system. Morphology and the structure of the powders were characterized by scanning electron microscope. The microwave absorbing characteristic of the coating was evaluated by measuring the reflection loss using an HP8757E scalar quantity network analyzer in the 2-18 GHz band range. The coatings were density, low porosity and uniform morphology. The reflection loss values of -10 dB are obtained in the 2~18GHz range. The minimum reflection loss of the coating is -13.12 dB at 12.64 GHz, and the bandwidth of the reflectivity below -5dB is 9.36GHz. It is indicated that the plasma spraying process is an effective way of preparing microwave absorbing coating.

scholarly journals Engineering of dielectric composites on electromagnetic and microwave absorbing properties for operation in the X-band

2020 ◽  
pp. 2150001
Author(s):  
Bhoopendra Singh ◽  
Vivek Pratap ◽  
Mohit Katiyar ◽  
S. M. Abbas ◽  
Y. K. Sharma ◽  
...  
Keyword(s):  
Dielectric Loss ◽  
Network Analyzer ◽  
Frequency Range ◽  
Melt Mixing ◽  
Band Frequency ◽  
Microwave Absorbing Properties ◽  
X Band ◽  
Mixing Method ◽  
Microwave Absorbing ◽  
Potential Use

In this study, carbon black (CB) powder-loaded polyurethane (PU) composites (CB–PU composites) were prepared by melt mixing method with different volume percentages (45, 50, 55, 58 and 61 vol.%) of CB in the PU matrix. The prepared CB–PU composites had been further studied for surface morphology using the field-emission scanning electron microscopy (FESEM) technique. Dielectric properties in terms of real permittivity ([Formula: see text] and imaginary permittivity ([Formula: see text] of the fabricated composites were computed using an Agilent E8364B vector network analyzer in the frequency range of 8–12 GHz ([Formula: see text]-band). Dielectric loss factor of the prepared CB–PU composites was computed in terms of the dielectric loss tangent (tan [Formula: see text] = [Formula: see text]/[Formula: see text]. Microwave absorbing properties were appraised in terms of the reflection loss (RL) which in turn was calculated for varying thicknesses of the prepared composites from the measured real and imaginary permittivity data. The minimum RL was observed as −20.10 dB for the absorber with a thickness of 2.2 mm and the bandwidth achieved was 1.92 GHz for RL [Formula: see text]10 dB. Based on the above results these CB–PU composites have potential use as effective microwave absorbers in 8–12-GHz ([Formula: see text]-band) frequency range.

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