MAGNETIC PROPERTIES AND INDUCTION HEATING OF NiZn FERRITE NANOPARTICLES

2008 ◽  
Vol 22 (15) ◽  
pp. 1497-1505 ◽  
Author(s):  
QIGANG JIAO ◽  
YI ZHANG ◽  
YA ZHAI ◽  
XIAOJUN BAI ◽  
WEI ZHANG ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Heating Rate ◽  
Induction Heating ◽  
Specific Absorption Rate ◽  
Ni Content ◽  
Maximum Value ◽  
Zn Ferrite ◽  
Average Size ◽  
20 Nm ◽  
Heating Behavior

A series of nanoparticle powders of Ni x Zn 1-x Fe 2 O 4 (x = 0, 0.30, 0.40, 0.50, 0.55, 0.60, 0.70 and 1.0) ferrites was synthesized by the refluxing method at relatively low temperatures. The average size of nanoparticles is about 20 nm. The magnetic properties and induction heating behavior were investigated. On increasing the Ni content, x, from 0 to 0.50, the saturation magnetization and permeability increased, and then decreased with further increasing Ni content with the bulk Ni – Zn ferrite. The maximum value of magnetization was about 50 emu/g near x = 0.50, where the induction heating rate and induction heating final temperature of the ferrite-water suspension also showed maximum values. The specific absorption rate obtained from the initial induction heating rate curve was found to be linearly proportional to the square of the alternating magnetic field, which is roughly consistent with the theoretical power loss of magnetic materials in the alternating field.

Crystallization and Magnetic Properties of Melt-Spun SmCo7-x(Cr3C2)x Alloys

2013 ◽  
Vol 321-324 ◽  
pp. 125-128
Author(s):  
Li Ya Li ◽  
Jian Hong Yi ◽  
Yuan Dong Peng
Keyword(s):  
Magnetic Properties ◽  
Amorphous State ◽  
Domain Size ◽  
Amorphous Structure ◽  
Soft Magnetic ◽  
Interaction Domain ◽  
Melt Spun ◽  
Average Size ◽  
Individual Grains ◽  
20 Nm

The amorphous formation ability, crystallization behavior and magnetic properties of SmCo7 magnets melt-spun at 30 and 40 m/s have been studied. The ribbons melt-spun at 40 m/s exhibit amorphous structure in the range of 0.15x0.25 for SmCo7-x(Cr3C2)x alloys. In the amorphous state, these alloys are soft magnetic with intrinsic coercive field iHc of the order of 40-70 Oe. After annealing at 750 °C for 5 min, the alloy shows enhenced magnetic properties with iHc of 7.98 kOe, Mr of 55.05 emu/g, and Mr of 70.99 emu/g. The MFM image reveals a uniform distribution of individual grains with average size about 20 nm and a domain size about 100250 nm in width. This interaction domain results in the enhancement of the magnetic properties.

Effect of Ni content on the structural, morphological and magnetic properties of spray deposited Ni–Zn ferrite thin films

2015 ◽  
Vol 67 ◽  
pp. 47-54 ◽  
Author(s):  
S.S. Kumbhar ◽  
M.A. Mahadik ◽  
V.S. Mohite ◽  
Y.M. Hunge ◽  
K.Y. Rajpure ◽  
...  
Keyword(s):  
Thin Films ◽  
Magnetic Properties ◽  
Ni Content ◽  
Zn Ferrite ◽  
Ferrite Thin Films

Comparative Study of Pure and Ni-Doped ZnFe2O4 Nanoparticles for Structural, Optical and Magnetic Properties

2013 ◽  
Vol 699 ◽  
pp. 524-529 ◽  
Author(s):  
A. Manikandan ◽  
J. Judith Vijaya ◽  
L. John Kennedy
Keyword(s):  
Magnetic Properties ◽  
Combustion Method ◽  
Vibrating Sample Magnetometer ◽  
X Ray Diffraction ◽  
Energy Band Gap ◽  
X Ray ◽  
Microwave Combustion ◽  
Ni Content ◽  
Maximum Value ◽  
Microwave Combustion Method

Pure and Ni-doped ZnFe2O4 nanoparticles, Zn1-xNixFe2O4 (x = 0.0, 0.1, 0.2, 0.3, 0.4 and 0.5) were synthesized by microwave combustion method (MCM). The structural, morphological and magnetic properties of the products were determined by X-ray diffraction (XRD), high resolution scanning electron microscopy (HR-SEM) and vibrating sample magnetometer (VSM). X-ray analysis showed that all the compositions crystallize with cubic spinel structure. The broadband visible emission is observed in the entire photoluminescence (PL) spectrum and the estimated energy band gap is about 2.1 eV. VSM measurements shows superparamagnetic behavior for lower concentration of Ni (x ≤ 0.2), whereas for higher concentration (x ≥ 0.2), it becomes ferromagnetic. The saturation magnetization (Ms) varies considerably with Ni content to reach a maximum value for Ni0.5Zn0.5Fe2O4 composition, i.e. 57.89 emu/g.

scholarly journals Мессбауэровские исследования наночастиц FeO/Fe-=SUB=-3-=/SUB=-O-=SUB=-4-=/SUB=- типа ядро/оболочка

2018 ◽  
Vol 60 (2) ◽  
pp. 375
Author(s):  
А.С. Камзин ◽  
А.А. Валиуллин ◽  
H. Khurshid ◽  
Z. Nemati ◽  
H. Srikanth ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Exchange Coupling ◽  
Specific Absorption Rate ◽  
Spherical Shape ◽  
Alternating Magnetic Field ◽  
Effective Anisotropy ◽  
The Core ◽  
Average Size ◽  
20 Nm ◽  
Factor Governing

AbstractFeO/Fe_3O_4 nanoparticles were synthesized by thermal decomposition. Electron microscopy revealed that these nanoparticles were of the core-shell type and had a spherical shape with an average size of ~20 nm. It was found that the obtained FeO/Fe_3O_4 nanoparticles had exchange coupling. The effect of anisotropy on the efficiency of heating (hyperthermic effect) of FeO/Fe_3O_4 nanoparticles by an external alternating magnetic field was examined. The specific absorption rate (SAR) of the studied nanoparticles was 135 W/g in the experiment with an external alternating magnetic field with a strength of 600 Oe and a frequency of 310 kHz. These data led to an important insight: the saturation magnetization is not the only factor governing the SAR, and the efficiency of heating of magnetic FeO/Fe_3O_4 nanoparticles may be increased by enhancing the effective anisotropy. Mössbauer spectroscopy of the phase composition of the synthesized nanoparticles clearly revealed the simultaneous presence of three phases: magnetite Fe_3O_4, maghemite γ-Fe_2O_3, and wustite FeO.

Structural, Morphological and Magnetic Characterization of Sm-substituted Ni-Zn Ferrite

2020 ◽  
Vol 10 (2) ◽  
pp. 152-156 ◽  
Author(s):  
Muhammad Hanif bin Zahari ◽  
Beh Hoe Guan ◽  
Lee Kean Chuan ◽  
Afiq Azri bin Zainudin
Keyword(s):  
Magnetic Properties ◽  
Rare Earth ◽  
Saturation Magnetization ◽  
Sol Gel ◽  
Magnetic Behavior ◽  
Rare Earth Ions ◽  
Ion Concentration ◽  
Zn Ferrite ◽  
Auto Combustion ◽  
Combustion Technique

Background: Rare earth materials are known for its salient electrical insulation properties with high values of electrical resistivity. It is expected that the substitution of rare earth ions into spinel ferrites could significantly alter its magnetic properties. In this work, the effect of the addition of Samarium ions on the structural, morphological and magnetic properties of Ni0.5Zn0.5SmxFe2-xO4 (x=0.00, 0.02, 0.04, 0.06, 0.08, 0.10) synthesized using sol-gel auto combustion technique was investigated. Methods: A series of Samarium-substituted Ni-Zn ferrite nanoparticles (Ni0.5Zn0.5SmxFe2-xO4 where x=0.00, 0.02, 0.04, 0.06, 0.08, 0.10) were synthesized by sol-gel auto-combustion technique. Structural, morphological and magnetic properties of the samples were examined through X-Ray Diffraction (XRD), Field-Emission Scanning Electron Microscope (FESEM) and Vibrating Sample Magnetometer (VSM) measurements. Results: XRD patterns revealed single-phased samples with spinel cubic structure up to x= 0.04. The average crystallite size of the samples varied in the range of 41.8 – 85.6 nm. The prepared samples exhibited agglomerated particles with larger grain size observed in Sm-substituted Ni-Zn ferrite as compared to the unsubstituted sample. The prepared samples exhibited typical soft magnetic behavior as evidenced by the small coercivity field. The magnetic saturation, Ms values decreased as the Sm3+ concentration increases. Conclusion: The substituted Ni-Zn ferrites form agglomerated particles inching towards more uniform microstructure with each increase in Sm3+ substitution. The saturation magnetization of substituted samples decreases with the increase of samarium ion concentration. The decrease in saturation magnetization can be explained based on weak super exchange interaction between A and B sites. The difference in magnetic properties between the samples despite the slight difference in Sm3+ concentrations suggests that the properties of the NiZnFe2O4 can be ‘tuned’, depending on the present need, through the substitution of Fe3+ with rare earth ions.

Temperature and field dependences of transverse relaxivity of Co–Zn ferrite nanoparticles coated with silica: The role of magnetic properties and different regimes

2021 ◽  
Vol 260 ◽  
pp. 124178
Author(s):  
Pavel Veverka ◽  
Lenka Kubíčková ◽  
Zdeněk Jirák ◽  
Vít Herynek ◽  
Miroslav Veverka ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Ferrite Nanoparticles ◽  
Zn Ferrite

scholarly journals High Bending Strength Hypereutectic Al-22Si-0.2Fe-0.1Cu-Re Alloy Fabricated by Selective Laser Melting

Metals ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 528
Author(s):  
Chunyue Yin ◽  
Zhehao Lu ◽  
Xianshun Wei ◽  
Biao Yan ◽  
Pengfei Yan
Keyword(s):  
Selective Laser Melting ◽  
Bending Strength ◽  
Primary Silicon ◽  
Processing Parameters ◽  
Powder Materials ◽  
Laser Melting ◽  
Maximum Value ◽  
Fine Microstructure ◽  
Average Size ◽  
Al Matrix

The objective of the study is to investigate the corresponding microstructure and mechanical properties, especially bending strength, of the hypereutectic Al-Si alloy processed by selective laser melting (SLM). Almost dense Al-22Si-0.2Fe-0.1Cu-Re alloy is fabricated from a novel type of powder materials with optimized processing parameters. Phase analysis of such Al-22Si-0.2Fe-0.1Cu-Re alloy shows that the solubility of Si in Al matrix increases significantly. The fine microstructure can be observed, divided into three zones: fine zones, coarse zones, and heat-affected zones (HAZs). Fine zones are directly generated from the liquid phase with the characteristic of petaloid structures and bulk Al-Si eutectic. Due to the fine microstructure induced by the rapid cooling rate of SLM, the primary silicon presents a minimum average size of ~0.5 μm in fine zones, significantly smaller than that in the conventional produced hypereutectic samples. Moreover, the maximum value of Vickers hardness reaches ~170 HV0.2, and bending strength increases to 687.70 MPa for the as-built Al-22Si-0.2Fe-0.1Cu-Re alloys parts, which is much higher than that of cast counterparts. The formation mechanism of this fine microstructure and the enhancement reasons of bending strength are also discussed.

Effect of the Ni content on the thermal and magnetic properties of Fe–Ni–Co alloys

2021 ◽  
Vol 261 ◽  
pp. 124215
Author(s):  
A. Paganotti ◽  
C.V.X. Bessa ◽  
C.C.S. Silva ◽  
E.B. Peixoto ◽  
J.G.S. Duque ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Ni Content ◽  
Co Alloys
Sign in / Sign up

Export Citation Format

Share Document