scholarly journals Structural and Magnetic Properties of (Mg, Co)2W Hexaferrites

2020 ◽  
Vol 13 (1) ◽  
pp. 1-16
Keyword(s):  
Magnetic Properties ◽  
Sintering Temperature ◽  
High Energy ◽  
Spin Reorientation ◽  
Magnetic Data ◽  
Sem Images ◽  
Intermediate Phases ◽  
Structural And Magnetic Properties ◽  
Xrd Patterns ◽  
Precursor Powders

Precursor powders of BaMg2-xCoxFe16O27 with (x = 0.0, 1.0, and 2.0) were prepared using high-energy ball milling and the effects of chemical composition and sintering temperature on the structural and magnetic properties were investigated using x-ray diffractometer (XRD), scanning electron microscopy (SEM) and vibrating sample magnetometry (VSM). XRD patterns of the prepared samples indicated that crystallization of pure BaW hexaferrite phase was achieved at a sintering temperature of 1300° C, while BaM and cubic spinel intermediate phases were obtained at lower sintering temperatures of 1100° C and 1200° C. SEM images revealed an improvement of crystallization of the structural phases and a growth of the particle size with increasing the sintering temperature. The magnetic data of the samples sintered at 1300° C revealed an increase of the saturation magnetization from 59.4 emu/g to 72.6 emu/g with increasing Co concentration (x) from 0.0 to 2.0. The coercive field Hc decreased from 0.07 kOe at x = 0.0 to 0.03 kOe at x = 1.0 and then increased to 0.09 kOe at x = 2.0. The thermomagnetic curves of the samples sintered at 1300° C confirmed the existence of the W-type phase and revealed spin reorientation transitions in Co-containing samples.

scholarly journals Structural and Magnetic Properties of Ba3[Cu0.8−xZnxMn0.2]2Fe24O41 Z-Type Hexaferrites

2018 ◽  
Vol 2018 ◽  
pp. 1-11
Author(s):  
Eman S. Al-Hwaitat ◽  
Sami H. Mahmood ◽  
Mahmoud Al–Hussein ◽  
Ibrahim Bsoul
Keyword(s):  
Magnetic Properties ◽  
Anisotropy Field ◽  
High Energy ◽  
X Ray Diffraction ◽  
Zn Content ◽  
Energy Ball ◽  
Structural And Magnetic Properties ◽  
Ball Milling Technique ◽  
Xrd Patterns

We report on the synthesis and characterization of Ba3[Cu0.8−xZnxMn0.2]2Fe24O41 (x = 0.0, 0.2, 0.4, 0.6, and 0.8) barium hexaferrites. The samples were prepared by high-energy ball-milling technique and double-sintering approach. The effects of Zn substitution for Cu on the structural and magnetic properties of the prepared samples were investigated using X-ray diffraction (XRD), scanning electron microscopy (SEM), and vibrating sample magnetometer (VSM). XRD patterns of the samples revealed the presence of a major Z-type hexaferrite phase, together with secondary M-type and Y-type phases. The magnetic results indicated that the saturation magnetization increased slightly with increasing the Zn content, while the coercivity and magnetocrystalline anisotropy field exhibited a decreasing tendency with the increase of Zn content. The thermomagnetic curves revealed the complex magnetic structure of the prepared samples and confirmed that the Curie temperature of the magnetic phases decreased with increasing x as a result of the reduction of the strength of the superexchange interactions.

scholarly journals Effects of Milling Atmosphere and Increasing Sintering Temperature on the Magnetic Properties of Nanocrystalline Ni0.36Zn0.64Fe2O4

2015 ◽  
Vol 2015 ◽  
pp. 1-11 ◽  
Author(s):  
Abdollah Hajalilou ◽  
Mansor Hashim ◽  
Halimah Mohamed Kamari ◽  
Mohamad Taghi Masoudi
Keyword(s):  
Magnetic Properties ◽  
Sintering Temperature ◽  
Parallel Evolution ◽  
High Energy ◽  
High Energy Ball Mill ◽  
Zn Ferrite ◽  
Crystallite Sizes ◽  
Energy Ball ◽  
Xrd Patterns ◽  
Fesem Micrographs

Nanocrystalline Ni0.36Zn0.64Fe2O4was synthesized by milling a powder mixture of Zn, NiO, and Fe2O3in a high-energy ball mill for 30 h under three different atmospheres of air, argon, and oxygen. After sintering the 30 h milled samples at 500°C, the XRD patterns suggested the formation of a single phase of Ni-Zn ferrite. The XRD results indicated the average crystallite sizes to be 15, 14, and 16 nm, respectively, for the 30 h milled samples in air, argon, and oxygen atmospheres sintered at 500°C. From the FeSEM micrographs, the average grain sizes of the mentioned samples were 83, 75, and 105 nm, respectively, which grew to 284, 243, and 302 nm after sintering to 900°C. A density of all the samples increased while a porosity decreased by elevating sintering temperature. The parallel evolution of changes in magnetic properties, due to microstructural variations with changes in the milling atmosphere and sintering temperature in the rage of 500–900°C with 100°C increments, is also studied in this work.

Structural and Magnetic Properties of Different Temperature Sintering La-Substituted Barium Ferrite

2012 ◽  
Vol 583 ◽  
pp. 272-275
Author(s):  
Jie Li ◽  
Huai Wu Zhang ◽  
Yuan Xun Li ◽  
Qiang Li ◽  
Yan Bing Ma
Keyword(s):  
Magnetic Properties ◽  
Spinel Structure ◽  
Barium Ferrite ◽  
Single Phase ◽  
Sintering Temperature ◽  
Solid State Reaction Technique ◽  
Sem Images ◽  
Phase Spinel ◽  
Structural And Magnetic Properties ◽  
Microstructure Density

The Ba1-xLaxFe12O19 (0.0≤x≤0.6) ferrite materials were prepared by the standard solid state reaction technique method and sintered at 920 °C with 4 wt% Bi2O3 and at 1150 °C without Bi2O3 in air. The influence of La3+ contents on the microstructure, density, and magnetic properties were studied. The XRD results showed essentially single phase spinel structure. The SEM images of the samples had no obvious relationship with the substituting value. Saturation magnetization continuously decreased from 59.37 emu/g to 57.93 emu/g with sintering temperature from 1150 °C to 920 °C. However, coercive force reached the value of 4547.0 Oe when x=0.6 at 920 °C. The density of the samples also decreased monotonously with increasing x value.

Investigation of the Structural and Magnetic Properties of BaM Hexaferrites Prepared from Scrap Iron Filings

2021 ◽  
Vol 14 (4) ◽  
pp. 287-299
Keyword(s):  
Magnetic Properties ◽  
Magnetic Recording ◽  
Barium Carbonate ◽  
Oxide Phase ◽  
Magnetic Oxide ◽  
Sem Images ◽  
Conventional Solid State Reaction ◽  
Scrap Iron ◽  
Xrd Patterns ◽  
High Density Magnetic Recording

Abstract: In this work, we demonstrate the feasibility of preparing a commercially important type of magnetic oxide, BaM (BaFe12O19) hexaferrite, using scrap iron filings as an iron source. The hexaferrites were prepared by conventional solid state reaction and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and magnetization measurements. XRD patterns of samples prepared by mixing powders extracted from the iron filings with appropriate amounts of barium carbonate and sintering at 1200 °C revealed the presence of a major BaM hexaferrite with small amounts of nonmagnetic α-Fe2O3 oxide phase. On the other hand, SEM images of the samples showed clear crystallization of perfect hexagonal platelets of BaM hexaferrite, which was further confirmed by the Curie temperature determined from the thermomagnetic measurements. The saturation magnetization of the samples was in the range of 45.1– 52.1 emu/g and the remnant magnetization in the range of 14.8 – 19.0 emu/g. These values and the moderate coercivity of ~ 1 kOe suggest that the prepared samples could potentially be useful for high-density magnetic recording. Keywords: Hexaferrite, Solid waste, Magnetic Properties, Structural properties, Magnetic recording.

Effect of Temperature on the Structural and Magnetic Properties of Co0.7Zn0.3Fe2O4 Ceramic Prepared from Solid State Reaction

2015 ◽  
Vol 804 ◽  
pp. 38-41
Author(s):  
Pattarinee Klumdoung ◽  
Piyapong Pankaew
Keyword(s):  
Crystal Structure ◽  
Solid Solution ◽  
Magnetic Properties ◽  
Solid State ◽  
Solid State Reaction ◽  
Sintering Temperature ◽  
Effect Of Temperature ◽  
Dense Structure ◽  
Paramagnetic Behavior ◽  
Structural And Magnetic Properties

In present study, the Co0.7Zn0.3Fe2O4 ceramic was prepared using solid state reaction. The crystal structure of prepared ceramic indicated as solid solution. The SEM result indicated the dense structure of prepared ceramic as increased sintering temperature. For VSM result of Co0.7Zn0.3Fe2O4 ceramic indicated the super paramagnetic behavior with high magnetization. These results could lead us to the development of Co0.7Zn0.3Fe2O4 ceramic preparation optimized for specific applications.

Structural and magnetic properties of DyCo4−xFexGa compounds

2010 ◽  
Vol 25 (S1) ◽  
pp. S31-S35
Author(s):  
W. H. Zhang ◽  
J. Q. Li ◽  
Y. J. Yu ◽  
F. S. Liu ◽  
W. Q. Ao ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Magnetic Measurements ◽  
Uniaxial Anisotropy ◽  
Solubility Limit ◽  
Spin Reorientation ◽  
X Ray Diffraction ◽  
X Ray ◽  
Cell Parameters ◽  
Spin Reorientation Transition ◽  
Structural And Magnetic Properties

The structural and magnetic properties of the DyCo4−xFexGa compounds with x=0, 0.5, 1, and 1.5 have been investigated by X-ray diffraction and magnetic measurements. Powder X-ray diffraction analysis reveals that each of the DyCo4−xFexGa compounds has a hexagonal CaCu5-type structure (space group P6/mmm). The Fe solubility limit in DyCo4−xFexGa is x<1.5. The higher the value of x, the larger the unit-cell parameters a, c, V, and the 3d-sublattice moment but the smaller the 3d uniaxial anisotropy. Magnetic measurements show that the Curie temperature of DyCo4−xFexGa increases from 498 K for x=0 to 530 K for x=1.5, the compensation temperature Tcomp decreases from 286 K for x=0 to 238 K for x=1.5, and the spin-reorientation transition temperature increases from 403 K for x=0 to 530 K for x=0.5. No spin-reorientation transition was found in the samples with x=1.0 and 1.5. The saturation magnetization of DyCo4−xFexGa measured at 173 K increases but the magnetization measured at 300 K decreases with increasing Fe content x.

scholarly journals Structural, Dielectric and Magnetic properties of Yttrium doped Hematite Nanoparticle

2021 ◽  
Author(s):  
Vijay Kumar ◽  
Dharamvir Singh Ahlawat ◽  
Amrik Singh ◽  
Arun Kumar ◽  
Ompal Singh
Keyword(s):  
Health Care ◽  
Grain Size ◽  
Magnetic Properties ◽  
Rare Earth ◽  
Crystallite Size ◽  
Data Storage ◽  
Rare Earth Metals ◽  
Magnetic Data ◽  
Xrd Patterns ◽  
Rhombohedral Symmetry

Abstract Applicability of magnetic crystalline nanoparticles particularly in the diagnostic field of health care and magnetic data storage makes them highly important for various technological researches. Novel properties of prepared nanoparticles can be tuned with doping of rare earth metals. In the present research, Yttrium (Y) doped hematite nanocrystalline samples have been prepared at various compositions, Fe2 − 2xY2xO3 (x = 0.00, 0.02, 0.05, 0.08, 0.10) and magnetic properties are seen sensitive with dopants concentration. The variation in grain size from FE-SEM is found well collaborated with the crystallite size and strain determined by XRD measurements. Rietveld refinement of XRD patterns reveals the formation of rhombohedral symmetry with Rˉ3c space group of the samples. The dielectric and magnetic properties show wiggling behaviour with the concentration of doping metal. A shift towards weakly ferromagnetic conduct like behaviour has been confirmed with the doping of Y in hematite crystalline particles.

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