Preparation and Electromagnetic Properties of Manganese Zinc Ferrite/Barium Ferrite Composite Materials

2012 ◽  
Vol 519 ◽  
pp. 215-219
Author(s):  
Quan Yuan ◽  
Wang Qun ◽  
Zhi Xue Qu ◽  
Zi Xin Gu ◽  
Tong Wu
Keyword(s):  
Composite Materials ◽  
Barium Ferrite ◽  
Zinc Ferrite ◽  
Spinel Phase ◽  
Electromagnetic Properties ◽  
X Ray Diffraction ◽  
Sem Images ◽  
X Ray ◽  
Manganese Zinc ◽  
Manganese Zinc Ferrite

Abstract: Manganese zinc ferrite/barium ferrite composite materials were prepared with various content of Z type barium ferrite (0, 10, 20 wt%) using solid state reaction method. The effect of the compositon on the microstructure and electromagnetic properties of the composites are investigated by means of X-ray diffraction, scanning electron microscope and impedance analyzer. The X-ray diffraction patterns reveal that W phase of barium ferrite instead of Z phase appears in the composite sintered as well as the spinel phase. Some small hexagonal grains were observed in the SEM images and the proportion increases with increasing content of barium ferrite. The cut-off frequencies of the composite systematically shift towards high frequency from 2.5 MHz to 32.6 MHz which is attributed to the increasing of W phase. The composites show a higher frequency for the maximum of the impedance as well as a higher value of the impedance at certain frequency which may be benefit for the application at GHz frequency range.

scholarly journals Design and Performance Research on Dual Layer Cement Based Absorber Reinforced with Graphene Nanosheets and Manganese-zinc Ferrite

2021 ◽  
Author(s):  
Yafei SUN ◽  
Tianshu ZHOU ◽  
Yueyue PENG ◽  
Hongwei LIU
Keyword(s):  
Mechanical Properties ◽  
Electrical Resistivity ◽  
Zinc Ferrite ◽  
Graphene Nanosheets ◽  
Effective Bandwidth ◽  
X Ray Diffraction ◽  
Sem Images ◽  
Manganese Zinc ◽  
Manganese Zinc Ferrite ◽  
And Performance

Dual layer cement-based absorber is synthesized by mixing with graphene nanosheets and manganese-zinc ferrite, to study the effect of absorbing filler content on the mechanical properties, microstructure, electrical resistivity and reflectivity of the paste. The microstructure of the absorber is seen by Scanning Electron Microscope (SEM) images, Fourier Transform Infrared (FTIR) spectroscopy, X-Ray Diffraction (XRD) curves of the absorber. The results show that graphene nanosheets significantly reduce the electrical resistivity of paste, increasing its mechanical properties by improving its pore structure. SEM images indicate that graphene nanosheets promote the increase and coarsening of cement hydration products and produce a large number of dense bulk crystals. Furthermore, reflectivity measurements show that the minimum reflectivity of – 14.1 dB is obtained in the range of 2 ~ 18 GHz and the effective bandwidth of 16 GHz is obtained when reflectivity is less than – 7 dB. This study provides a new method for the preparation of dual layer cement-based absorber.

Magnetic Properties of Manganese-Titanium Substituted Barium Ferrite Ba(TiMn)xFe12-2xO19(x=0.0, 0.5, 1.0, 1.5, 2.0) Prepared by the Molten Salt Method

2010 ◽  
Vol 434-435 ◽  
pp. 240-243 ◽  
Author(s):  
Hai Feng Li ◽  
Rong Zhou Gong ◽  
Hao Luo ◽  
Jun Zhou ◽  
Li Ren Fan ◽  
...  
Keyword(s):  
Hysteresis Loop ◽  
Molten Salt ◽  
Barium Ferrite ◽  
Magnetic Hysteresis ◽  
Magnetic Hysteresis Loop ◽  
Electromagnetic Properties ◽  
Molten Salt Method ◽  
Frequency Range ◽  
X Ray Diffraction ◽  
X Ray

M-type hexaferrites Ba(TiMn)xFe12-2xO19 (x=0 to 2) powders were synthesized by molten salt method. X-ray diffraction, scanning electron microscope and vibrating sample magnetometer were used to analyze the structures and electromagnetic properties. The results showed that, the magnetoplumbite structures for all samples were formed. Magnetic hysteresis loop measurements of the Ba(TiMn)xFe12-2xO19, exhibitted that the saturation magnetization (Ms), the remanent magnetization (Mr) and the coercitivity (Hc) of compounds depended strongly on the chemical composition of materials. The maxium values of Ms (52.68emu/g) and Mr (32.89emu/g) of the compounds were found at x=0.5; however, the values of Hc and the areas of magnetic hysteresis loop of compounds decreased with increasing the value of x. The Ba(TiMn)1.5Fe9O19/paraffin wax composites containing 40vol% of doped barium ferrite exhibitted good absorption performances in the frequency range of 2–14 GHz.

Effects of NiO addition on the structural, microstructural and electromagnetic properties of manganese–zinc ferrite

2009 ◽  
Vol 113 (2-3) ◽  
pp. 797-802 ◽  
Author(s):  
Ke Sun ◽  
Zhongwen Lan ◽  
Zhong Yu ◽  
Lezhong Li ◽  
Haining Ji ◽  
...  
Keyword(s):  
Zinc Ferrite ◽  
Electromagnetic Properties ◽  
Manganese Zinc ◽  
Manganese Zinc Ferrite

scholarly journals XRD Studies on Titanium Substituted Manganese-Zinc Ferrite System, Mn0.8+xZn0.2TixFe2-2xO4 with x=0.10, 0.15, 0.20

2014 ◽  
Vol 2 ◽  
pp. 40-51 ◽  
Author(s):  
D.J. Satheesh ◽  
N. Vasudevan Nair ◽  
Isac Jayakumari
Keyword(s):  
X Ray Diffraction ◽  
Slow Cooling ◽  
Conventional Solid State Reaction ◽  
X Ray ◽  
Manganese Zinc ◽  
Manganese Zinc Ferrite ◽  
Hall Plot ◽  
Average Grain Size ◽  
Particle Size Determination ◽  
Phase Spinel

Mn0.8+x Zn0.2TixFe2-2xO4 where x=0.1, 0.15, 0.20 were prepared by conventional solid state reaction technique starting with AR grade MnO, ZnO, TiO2 and Fe2O3. Final sintering was done at 1150°C for 20 hours followed by slow cooling to room temperature. The sample was analyzed by X-ray Diffraction (XRD), Particle size determination, SEM and EDX. The comparison of XRD results with JCPDS files confirmed the single phase spinel structure. Scanning Electron Microscopy (SEM) studies revealed that the average grain size of samples as 10μm. EDX spectrum shows the elements of the sample. X-ray instrumental broadening analysis was used to evaluate the size and lattice strain by the Williamson-Hall Plot method.

Magnetic and Dielectric Properties of Nanophase Lithium-Substituted Manganese-Zinc Ferrite

2010 ◽  
Vol 168-169 ◽  
pp. 353-356 ◽  
Author(s):  
E. De Fazio ◽  
P.G. Bercoff ◽  
Silvia E. Jacobo
Keyword(s):  
Spinel Phase ◽  
Sol Gel ◽  
Cubic Phase ◽  
Microwave Range ◽  
X Ray Diffraction ◽  
Manganese Zinc ◽  
Manganese Zinc Ferrite ◽  
Manganese Zinc Ferrites ◽  
Mnzn Ferrites ◽  
Li Substitution

Nanocrystalline lithium-substituted manganese-zinc ferrites Li0.5xMn0.4Zn0.6-xFe2+0.5xO4 were prepared by the sol-gel autocombustion method. X-ray diffraction analysis (XRD) confirmed that samples are single-phase and that only a spinel phase is present. The saturation magnetization increases while the cell parameter of the cubic phase decreases with Li concentration. Magnetic permeability and dielectric permittivity of all samples were measured at room temperature as a function of frequency. Reflection loss calculations show that the prepared samples are good electromagnetic wave absorbers in microwave range. Li substitution plays an important role in changing the structural and magnetic properties of these MnZn ferrites.

Properties of Low Temperature Fired Ferroelectric/Ferromagnetic Composite Materials

2014 ◽  
Vol 787 ◽  
pp. 313-316
Author(s):  
Dai Nan Zhang ◽  
Wei Wei Lin ◽  
Huai Wu Zhang
Keyword(s):  
Composite Materials ◽  
Low Temperature ◽  
Solid State Reaction Method ◽  
Ceramic Technology ◽  
Electromagnetic Properties ◽  
X Ray Diffraction ◽  
Conventional Solid State Reaction ◽  
Reaction Method ◽  
X Ray ◽  
Sintered Composite

In this paper, Ni0.60Cu0.24Zn0.16Fe2O4/BaTiO3composites of BaTiO3(BT)/NiCuZn (NCZ) with mass ratios (x) equal to 5%, 10%, 15% or 20% were synthesised by a conventional solid-state reaction method and sintered at 900oC to adapt to low temperature co-fired ceramic technology. X-ray diffraction results showed that the composites were composed of BT and NCZ phases. The microstructures of the sintered composite materials were observed and analysed using scanning electron microscopy. The dielectric and magnetic properties of the composites were improved effectively with increasing BaTiO3content. The influences of different compositions on the electromagnetic properties of the composites were investigated.

Preparation of Manganese Zinc Ferrite Nanoparticles by Polymer Matrix Templated Synthesis

2010 ◽  
Vol 97-101 ◽  
pp. 2171-2174
Author(s):  
Siti Hajar Mohd Noor ◽  
Iskandar Idris Yaacob
Keyword(s):  
Crystallite Size ◽  
Polymer Matrix ◽  
Zinc Ferrite ◽  
Manganese Content ◽  
Ferrite Nanoparticles ◽  
Templated Synthesis ◽  
X Ray ◽  
Manganese Zinc ◽  
Peak Broadening ◽  
Manganese Zinc Ferrite

MnxZn1-xFe2O4 nanoparticles with x = 0, 0.2, 0.4, 0.5, 0.6 and 1.0 were synthesized by polymer matrix templated synthesis. Ion exchange resins in a form of spherical beads that contained nanopores were used to precipitate the nanoparticles. The synthesized nanoparticles were characterized using several characterization techniques including X-ray diffractometry, transmission electron microscopy and alternating gradient magnetometry. XRD patterns showed that only manganese zinc ferrite nanoparticles were formed. Calculation of crystallite size from x-ray peak broadening showed that the crystallite sizes were within the range 5-11 nm. The crystallite size increased with increasing Mn concentration. TEM images showed that the particles were almost spherical with diameters ranging from 8-19 nm. Magnetization curves passed through the origin and showed no hysteresis indicated that the particles are superparamagnetic. The magnetization value at 10kOe applied magnetic field increased with increasing particle size which was mainly due to the effect of manganese content of the nanoparticles.

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