scholarly journals Characterization, Production and Microwave Absorbing Properties of Polyaniline-NiFe2O4: Tb Composites

2019 ◽  
Vol 25 (3) ◽  
pp. 322-327
Author(s):  
Ethem İlhan ŞAHIN ◽  
Selcuk PAKER ◽  
Mesut KARTAL
Keyword(s):  
Structural Analysis ◽  
Nickel Ferrite ◽  
Single Phase ◽  
Second Phase ◽  
Network Analyzer ◽  
Vibrating Sample Magnetometer ◽  
X Ray Diffraction ◽  
X Ray ◽  
Microwave Absorbing Properties ◽  
Microwave Absorbing

In this study, terbium-doped NiFe2O4 was produced by using mixed oxide technique. The Ni1-xTbxFe2O4 composition was synthesized and x was selected as 0.025, 0.050 and 0.070, respectively. The single phase Ni ferrite was produced after sintering at 1250 °C for 4 h. X-ray diffraction (XRD), scanning Electron Microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS) were performed for the structural analysis. The results of the structural analysis indicated that second phase did not form in Ni1-xTbxFe2O4. Additionally, the polyaniline-terbium doped NiFe2O4 composites were produced by hot pressing using the compositions of Ni0.975Tb0.025Fe2O4.018, Ni0.950Tb0.050Fe2O4.037, Ni0.93Tb0.070Fe2O4.0525 and aniline. The weight ratios of terbium-doped nickel ferrite and aniline were 1:1 and 1:3 respectively and epoxy resin was used to produce microwave absorbing composites. The magnetic properties of fabricated composites were investigated using a vibrating sample magnetometer (VSM). The microwave absorbing performances of Polyaniline-NiFe2O4: Terbium composites were investigated by reflectivity in 0 – 8 GHz using two–port vector network analyzer. A minimum of – 39.41 dB reflection performance was obtained in 7.9 GHz at the thickness of 2.0 mm. This reflection performance can be modulated simply by controlling the content of polyaniline in the samples for the required frequency bands. DOI: http://dx.doi.org/10.5755/j01.ms.25.3.20810

Microwave Absorbing Properties of Polyaniline-NiFe2O4: V composites

2019 ◽  
Vol 41 (2) ◽  
pp. 246-246
Author(s):  
Ethem Ilhan SAHIN and Selcuk PAKER Mesut KARTAL Ethem Ilhan SAHIN and Selcuk PAKER Mesut KARTAL
Keyword(s):  
Structural Analysis ◽  
Nickel Ferrite ◽  
Single Phase ◽  
Second Phase ◽  
Network Analyzer ◽  
Vibrating Sample Magnetometer ◽  
X Ray Diffraction ◽  
X Ray ◽  
Microwave Absorbing Properties ◽  
Microwave Absorbing

In this study, vanadium doped NiFe2O4 was produced by using mixed oxide technique. The NiFe2-xVxO4 composition was synthesized and x was selected as 0.1, 0.2 and 0.3, respectively. The single-phase Ni ferrite was produced after sintering at 1100and#176;C for 4h. X-Ray diffraction (XRD), scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS) were performed for structural analysis. The results of the structural analysis indicated that the second phase did not form in NiFe2-xVxO4. Additionally, the polyaniline-vanadium doped NiFe2O4 composites were produced by hot pressing using the compositions of NiFe1.9V0.1O4.1, NiFe1.8V0.2O4.2, NiFe1.7V0.3O4.3, and aniline. The weight ratios of vanadium-doped nickel ferrite and aniline were 1:1 and 1:3, respectively. Epoxy resin was used to produce microwave-absorbing composites. The fabricated composites were characterized by using Fourier transform infrared spectroscopy (FTIR). Furthermore, the magnetic properties of the fabricated composites were investigated by using a vibrating sample magnetometer (VSM). The microwave absorbing performances of the polyaniline-NiFe2O4: V composites were investigated by reflectivity in 0–8 GHz, using a two–port vector network analyzer. A minimum of -42.17 dB reflection performance was obtained in 7.02 GHz at the thickness of 2.0 mm. This reflection performance can be modulated simply by controlling the content of polyaniline in the samples for the required frequency bands.

Study on optical and magnetic properties of FexNi1-xMn2O4 materials

2021 ◽  
Vol 66 (1) ◽  
pp. 57-64
Author(s):  
Hang Pham Vu Bich ◽  
Yen Nguyen Hai ◽  
Mai Phung Thi Thanh ◽  
Dung Dang Duc ◽  
Hung Nguyen Manh ◽  
...  
Keyword(s):  
Single Phase ◽  
Sol Gel ◽  
Vibrating Sample Magnetometer ◽  
Raman Scattering Spectrum ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scattering Spectrum ◽  
Diffraction Diagram ◽  
Optical And Magnetic Properties ◽  
Scanning Electron

In this study, we present the process of synthesis FexNi1-xMn2O4 (x = 0; 0.1; 0.3; 0.5; 0.7; 0.9; 1) by method sol-gel. Scanning electron microscope results shows that the particle size is about 50 nm. The X-ray diffraction diagram shows that the samples are single phase, changing structure clearly as the x ratio increases from 0 to 1. The lattice constant, the bond length also changes with x-value as shown on the Raman scattering spectrum. The results of the vibrating sample magnetometer show that the magnetism of the material FexNi1-xMn2O4 changes with the value of x and reaches a maximum in the range x from 0.5 to 0.7.

scholarly journals Sintesis Nanopartikel Nickel Ferrite (NiFe2O4) dengan Metode Kopresipitasi dan Karakterisasi Sifat Kemagnetannya (Halaman 20 s.d. 25)

2015 ◽  
Vol 19 (56) ◽  
Author(s):  
Muflihatun ◽  
Siti Shofiah ◽  
Edi Suharyadi
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Fourier Transform ◽  
Nickel Ferrite ◽  
Fourier Transform Infrared ◽  
Vibrating Sample Magnetometer ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron

Nanopartikel Nikel Ferit (NiFe2O4) telah disintesis dengan metode kopresipitasi dengan memvariasi konsentrasi NaOH dan suhu sintesis. Struktur kristal, ukuran partikel, dan morfologi dari sampel dianalisa menggunakan X-ray diffraction (XRD) dan transmission electron microscopy (TEM). Ukuran butir pada konsentrasi NaOH 3, 5, dan 10 M masing-masing adalah 5,7; 4,3; dan 4,2 nm, sedangkan pada suhu 60, 80, dan 150°C berturut-turut adalah 4,2; 4,9; dan 5,5 nm. Analisa fourier transform infrared (FTIR) menunjukkan dua puncak serapan pada rentang ~400-600 cm-1 yang terkait dengan site oktahedral dan tetrahedral pada struktur NiFe2O4. Sifat magnetik NiFe2O4 hasil analisa vibrating sample magnetometer (VSM) menunjukkan bahwa sampel berperilaku ferromagnetik dengan nilai koersivitasnya pada rentang 42-47 Oe. Sampel dengan variasi konsentrasi NaOH, koersivitasnya cenderung menurun dengan menurunnya ukuran partikel. Sementara sampel dengan variasi suhu, semakin kecil ukuran partikel, koersivitasnya cenderung meningkat. Pada 15 kOe, nilai magnetisasi terbesar (6,17 emu/g) diperoleh pada sampel dengan rasio fasa α-Fe2O3 paling rendah.

Synthesis of the Sr3Zn2Fe24O41 Z-Type Ferrite by Polymerizable Complex Method

2013 ◽  
Vol 566 ◽  
pp. 231-234 ◽  
Author(s):  
Takuya Tainaka ◽  
Takeyuki Kikuchi ◽  
Tatsuya Nakamura ◽  
Tohru Yamasaki ◽  
Makoto Nakanishi ◽  
...  
Keyword(s):  
Saturation Magnetization ◽  
Single Phase ◽  
Lattice Parameters ◽  
Complex Method ◽  
Vibrating Sample Magnetometer ◽  
Formula Unit ◽  
X Ray Diffraction ◽  
X Ray ◽  
Characteristic Two

Synthesis of Sr3Zn2Fe24O41 Z-type ferrite was investigated. Precursors of ferrite were prepared by polymerizable complex method. Identification of formed phases in the obtained samples and determination of lattice parameters of Z-type ferrite were performed by powder X-ray diffraction (XRD). Single-phase of Sr3Zn2Fe24O41 Z-type ferrite was synthesized by heating at 1463 K for 5hours in air. M-H curve of prepared single-phase Sr3Zn2Fe24O41 Z-type ferrite was measured by using vibrating sample magnetometer (VSM). It was revealed that Sr3Zn2Fe24O41 Z-type ferrite has larger saturation magnetization (23.5 μB/formula unit) than that of Sr3Co2Fe24O41 (22.7 μB/formula unit) and shows characteristic two-step saturation of magnetization as well as Sr3Co2Fe24O41 Z-type ferrite.

The Microwave Electromagnetic Properties of Sr2+ Doped DyFeO3

2011 ◽  
Vol 197-198 ◽  
pp. 405-408
Author(s):  
Shao Teng Yan ◽  
Xiao Gu Huang ◽  
Feng Dai ◽  
Peng De Han ◽  
Li Xi Wang ◽  
...  
Keyword(s):  
Single Phase ◽  
Intermediate Phase ◽  
Electromagnetic Properties ◽  
Network Analyzer ◽  
X Ray Diffraction ◽  
Conventional Solid State Reaction ◽  
X Ray ◽  
Xrd Patterns ◽  
Perovskite Type ◽  
Peak Value

Perovskite type ferrite doped with Sr2+, Dy1-xMxFeO3(x = 0.0, 0.05, 0.15, 0.25) were prepared by the conventional solid-state reaction. The structure and electromagnetic properties of the calcined samples were studied using powder X-ray diffraction (XRD, Rigaku D/Max-2500) and network analyzer (Agilent 8722ET). All the XRD patterns showed the single phase of the perovskite type ferrite without other intermediate phase when x≤0.25. The electromagnetic properties of the samples have been studied at the frequency range from 2 GHz to 18 GHz. The ε′ and ε′′ values were improved significantly. Both the values of ε′ and ε′′ increase with the increasing content of the doped cations Sr2+, and the peak value of ε′′ was about 2.2 at 12.1 GHz position when x = 0.25.

scholarly journals Microwave Absorbing Properties of NiZnCu Ferrite and Polychloropren Composites

2020 ◽  
pp. 27-32 ◽  
Author(s):  
Priscila Richa ◽  
Roberto Costa Lima ◽  
Ana Paula Santiago de Falco ◽  
Ana Paula da Silva ◽  
Elvia Leal ◽  
...  
Keyword(s):  
Single Phase ◽  
Xrd Analysis ◽  
Sem Analysis ◽  
Magnetic Losses ◽  
X Ray Diffraction ◽  
X Ray ◽  
Microwave Absorbing Properties ◽  
Absorbing Materials ◽  
Military Applications

Radar-absorbing materials (RAMs) have been used in military applications for several decades to reduce radar detection of vessels and aircrafts. In the present work, the performance of Ni0.35Zn0.35Cu0.3Fe2O4 ferrite as a RAM is investigated. The ferrite was firstly synthesized by combustion reaction and then calcinated at 1200 °C for 1 h. Composites were prepared with 80:20, 70:30 and 60:40 concentrations in weight of ferrite:polychloroprene. The X-ray diffraction (XRD) analysis showed a single phase ferrite formation and the scanning electron microscopy (SEM) analysis of the composites showed a good dispersion of the ferrite in the polychloroprene matrix. The electromagnetic (EM) characterization of the composites revealed that the EM attenuation is mainly attributed to magnetic losses observed in the material. The 80:20 composite achieved the best performance and presented a reflectivity of -26.7 dB at 10.2 GHz.

Structure and Magnetostriction of PrxTb1-xFe1.9Ti0.1 Alloys

2013 ◽  
Vol 281 ◽  
pp. 413-416
Author(s):  
He Yan Liu ◽  
Guo Dong Liu ◽  
Ying Li ◽  
Hong Zhi Luo ◽  
Shao Ling Zhang ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Crystal Structure ◽  
Single Phase ◽  
Annealing Treatment ◽  
Annealed Sample ◽  
Vibrating Sample Magnetometer ◽  
X Ray Diffraction ◽  
Standard Strain ◽  
X Ray ◽  
Type Crystal

The structure and magnetostriction have been investigated for PrxTb1-xFe1.9Ti0.1 alloys by means of the X-ray diffraction phase analysis, vibrating sample magnetometer, and standard strain gauge technique. Comparing the structure of bulk and annealed samples, it can be found that the annealing treatment is of benefit to the formation of single phase with MgCu2-type crystal structure when x0.3. The magnetization at the maximal magnetic field decreases rapidly with increasing Pr content. The magnetostriction for Pr0.2Tb0.8Fe1.9Ti0.1 annealed sample at 900kA/m is 1733ppm. The magnetostriction for PrxTb1-xFe1.9Ti0.1 alloys at 900kA/m also decreases with increasing Pr content.

Preparation of graphene/Fe3O4/Ni electromagnetic microwave absorbing nano-composite materials

2019 ◽  
Vol 33 (01n03) ◽  
pp. 1940055 ◽  
Author(s):  
Yu-Wei Huang ◽  
Yu-Jiang Wang ◽  
Shi-Cheng Wei ◽  
Yi Liang ◽  
Wei Huang ◽  
...  
Keyword(s):  
Composite Materials ◽  
Photoelectron Spectroscopy ◽  
Network Analyzer ◽  
Absorption Properties ◽  
Microwave Absorption Properties ◽  
Nano Composite ◽  
X Ray ◽  
Microwave Absorbing Properties ◽  
One Step ◽  
Microwave Absorbing

Graphene/Fe3O4/Ni nano-composite materials were prepared by one-step hydrothermal method from RGO, FeCl3 ⋅ 6H2O and purity Ni. The structure and electromagnetic microwave absorbing properties were investigated systematically by field emission scanning electron microscope (FESEM), X-ray diffractometer (XRD), X-ray photoelectron spectroscopy (XPS) and vector network analyzer (VNA). The reflectance was simulated based on the electromagnetic parameters to evaluate the absorption properties of the sample. The results show that Fe3O4 and Ni are on the surface of graphene evenly, the composites exhibit excellent microwave absorption properties, reflection loss and broad effective absorption bandwidth are −16.38 dB and 3.60 GHz, as the paraffin wax is 40% and the matching thickness is 2.00–3.50 mm.

Synthesis and Microwave-Absorbing Properties of Ni-Carbon Sphere Composites

2011 ◽  
Vol 399-401 ◽  
pp. 552-555 ◽  
Author(s):  
Yuan Guang Zhang ◽  
Hong Yu Xia ◽  
Ying Guo Zhao
Keyword(s):  
Electron Microscopy ◽  
Solid Phase ◽  
Energy Dispersive Spectrometer ◽  
Synthetic Approach ◽  
Carbon Sphere ◽  
X Ray Diffraction ◽  
X Ray ◽  
Microwave Absorbing Properties ◽  
Transmission Electron ◽  
Microwave Absorbing

A simple solid-phase synthetic approach has been exploited for the preparation of Ni-carbon sphere composites using Ni(CH3COO)2•4H2O as nickel source, and vitamin C (L-ascorbic acid) as reductant and carbon source at 500oC for 6 h. The products were characterized by X-ray diffraction analysis (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray energy dispersive spectrometer (EDS), raman spectroscopy and microwave-absorbing measurement. The results show that the products are composed of Ni-carbon sphere particles with average diameters of 1.2 µm. Each sphere particle contains embedded Ni particles with average diameters of 83 nm. The reflection loss (RL) values of the products are lower −10 dB at 2–18 GHz, displaying broad range of microwave absorption. Their minimum RL value is about −33 dB at 4.2 GHz, which exhibit good microwave absorbing properties.

Preparation and Electromagnetic Properties of Urchinlike Ni

2013 ◽  
Vol 803 ◽  
pp. 218-221
Author(s):  
Hai Ping Qi ◽  
Hai Lin Cao ◽  
Yu Dong Huang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Vector Network Analyzer ◽  
Electromagnetic Properties ◽  
Network Analyzer ◽  
X Ray Diffraction ◽  
Electromagnetic Parameters ◽  
X Ray ◽  
Microwave Absorbing Properties ◽  
Scanning Electron

Urchinlike Ni particles with different length and quantity spines were successful synthesized. The microstructures and morphologies of the resulting materials were investigated by X-ray diffraction and scanning electron microscopy. The amount of N2H4H2O plays an important role in the morphology of urchin. The electromagnetic parameters of these urchinlike Ni were measured with vector network analyzer at 2-18 GHz frequency. The results indicate that the microwave absorbing properties are improved by the urchin structure.

Sign in / Sign up

Export Citation Format

Share Document