scholarly journals Modification of the Magnetic Properties of Co2Y Hexaferrites by Divalent and Trivalent Metal Substitutions

2015 ◽  
Vol 241 ◽  
pp. 93-125 ◽  
Author(s):  
Sami H. Mahmood ◽  
Muna D. Zaqsaw ◽  
Osama E. Mohsen ◽  
Ahmad Awadallah ◽  
Ibrahim Bsoul ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Saturation Magnetization ◽  
Exchange Interactions ◽  
High Coercivity ◽  
Xrd Pattern ◽  
A Value ◽  
Type Phase ◽  
Ball Milling Technique ◽  
Xrd Patterns

The present study is concerned with the fabrication and characterization of Me2Y substituted hexaferrites, Ba2Me2Fe12-xTxO22(Me = Co2+, Mg2+, and Cr2+, and T = Fe3+, and Ga3+). The samples were prepared by the conventional ball milling technique and sintering at 1200° C. The effect of the choices of Me and T ions on the structural and magnetic properties of the hexaferrites were investigated. XRD patterns, magnetic parameters, and Mössbauer spectra of the Co2Y were consistent with a single phase Y-type hexaferrite. However, the CoCr-Y sample was found to be dominated by the Y-type hexaferrite, and M-type and BaCrO4minority phases were observed in the XRD pattern of the sample. The small increase in saturation magnetization from about 34 emu/g up to 37.5 emu/g was therefore attributed to the development of the M-type phase. On the other hand, XRD pattern of the Cr2Y sample indicated the dominance of the M-type phase in this sample. The high coercivity (1445 Oe) of this sample is evidence of the transformation of the material from a typically soft magnetic material (Y-type) to a hard magnet (M-type). The Ga-substitution for Fe in Co2Y did not affect the saturation magnetization significantly, but the coercivity was reduced. However, the sample Ba2CoMgFe11GaO22exhibited a significant reduction of the saturation magnetization down to a value 26.6 emu/g, which could be due to the attenuation of the super-exchange interactions induced by the Mg2+substitution.

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 Magnetic Properties of FePt Nanoparticles Prepared by Sonoelectrodeposition

2012 ◽  
Vol 2012 ◽  
pp. 1-4 ◽  
Author(s):  
Nguyen Hoang Nam ◽  
Nguyen Thi Thanh Van ◽  
Nguyen Dang Phu ◽  
Tran Thi Hong ◽  
Nguyen Hoang Hai ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Saturation Magnetization ◽  
Metallic Nanoparticles ◽  
Room Temperature ◽  
Cathode Surface ◽  
High Coercivity ◽  
Fept Nanoparticles ◽  
Promising Technique ◽  
Structural And Magnetic Properties

Sonoelectrodeposition is a useful technique to make metallic nanoparticles, using ultrasound during electrodeposition to remove nanoparticles as they grow on the cathode surface. This paper reports some structural and magnetic properties of FePt nanoparticles prepared by this method. The as-prepared Fe45Pt55nanoparticles were ferromagnetic at room temperature. Upon annealing at 700°C for 1 h under H2atmosphere, the saturation magnetization and the coercivity of the nanoparticles were improved significantly. The annealed nanoparticles showed a high coercivity of 13.5 kOe at 2 K and of 9 kOe at room temperature. Sonoelectrodeposition is a promising technique to make large quantity of FePt nanoparticles.

scholarly journals Effect of PEG-2000 on saturation magnetization Fe3O4 particles synthesized with coprecipitation method

2017 ◽  
Vol 1 (1) ◽  
pp. 49
Author(s):  
Dwi Puryanti ◽  
Dori Andani ◽  
Merry Thressia
Keyword(s):  
Magnetic Properties ◽  
Saturation Magnetization ◽  
Base Material ◽  
Diffraction Method ◽  
Coprecipitation Method ◽  
X Ray Diffraction ◽  
Magnetization Saturation ◽  
Sand Base ◽  
The Village

<p class="Abstract">Synthesis of Fe<sub>3</sub>O<sub>4</sub> particles was performed using coprecipitation method. Iron sand base material obtained by processing the iron rocks by means of destruction and extraction. Iron rocks were taken from the village Surian, South Solok of West Sumatera. Iron sand that has been extracted reacted with HCL and NH<sub>4</sub>OH. Furthermore, the PEG-2000 were added to see its effect on the resulting magnetization saturation. Variations in the composition ratio of iron sand and PEG-2000 are 1:0, 1:1, 1:2 and 1:4. The crystal structure of the sample was confirm using x-ray diffraction method. Characterization of magnetic properties carried out using vibrating Sample Magnetometer (VSM). The results of magnetic properties show that the saturation magnetization decreases with increasing of PEG-2000 content in the range of 99.50emu/g - 0,84 emu/g.</p>

scholarly journals Fabrication and Characterization of CoFe2O4/CoFe2/SiO2 Nanocomposite Particles

2020 ◽  
Vol 36 (4) ◽  
Author(s):  
Tran Thi Viet Nga
Keyword(s):  
Magnetic Properties ◽  
Single Phase ◽  
Sol Gel ◽  
Calcination Time ◽  
Nanocomposite Particles ◽  
X Ray ◽  
Fabrication And Characterization ◽  
Xrd Patterns ◽  
20 Nm

The CoFe2O4/CoFe2/SiO2 nanocomposite particles were synthesized using a sol- gel method and calcination in hydrogen. The magnetic properties and structure of nanocomposite particles calcinated at 600 oC and 900 oC in range of calcination time from 1 h to 4 h were investigated. The phase composition, surface morphology and magnetic properties of the nanocomposites were investigated using X-ray powder diffraction, scanning electron microscopy and vibrating sample magnetometer. The XRD patterns indicate the existence of both CoFe2O4 and CoFe2 phases in the nanocomposite after reducing at 600 oC for 2 h and 3 h. The single phase CoFe2 was obtained after reducing at 900 oC. The average particles size was evenly distributed in the range of 20 nm to 120 nm. The magnetization increases significantly with increasing of reduction temperature.

scholarly journals CRYSTALLIZATION AND CHARACTERIZATION OF CHROMIUM-CONTAINING SILICALITE-1

2010 ◽  
Vol 5 (3) ◽  
pp. 283-289 ◽  
Author(s):  
Hari Sutrisno ◽  
Endang Dwi Siswani ◽  
Susila Kristianingrum ◽  
Suharto Suharto
Keyword(s):  
Hydrothermal Method ◽  
Static Condition ◽  
Orthorhombic Structure ◽  
Space Group ◽  
Type Phase ◽  
Sio2 Phase ◽  
Pnma Space Group ◽  
Xrd Patterns

Chromium-containing silicalite-1, designed CrS-1, was synthesized by the hydrothermal method and characterized by XRD and FTIR techniques. The objectives of the research are to study the synthesis of CrS-1 and investigate the effect of crystallization temperatures and times toward its character. All samples of CrS-1 crystallized in orthorhombic structure and Pnma space group. The phase observed in the XRD patterns of CrS-1 synthesized from 150 to 190 oC for 11 days showed only MFI-type phase. The CrS-1 prepared under static condition for 1 day at 150 oC indicated -SiO2 phase, on the contrary, the samples conditioned for 2 to 8 days at 150 oC are only MFI phase.   Keywords: Crystallization, synthesis, chromium silicate CrS-1, incorporation.

MAGNETIC PROPERTIES OF AMORPHOUS Fe40Ni38B18Mo4 RIBBONS CONTAINING NANOCRYSTALLITES

2005 ◽  
Vol 19 (06) ◽  
pp. 295-302 ◽  
Author(s):  
K. TIVAKORNASITHORN ◽  
S. NILPAIRUCH ◽  
S. VATANAYON ◽  
I. M. TANG
Keyword(s):  
Thermal Analysis ◽  
Magnetic Properties ◽  
Differential Thermal Analysis ◽  
Saturation Magnetization ◽  
Mössbauer Effect ◽  
Vibrating Sample Magnetometer ◽  
Mossbauer Effect ◽  
Mössbauer Effect Spectroscopy ◽  
Temperature Ranges ◽  
Xrd Patterns

Cut Fe 40 Ni 38 B 18 Mo 4 ribbons were annealed for two hours at various temperatures Ta between 400 and 540°C. All the ribbons were subjected to XRD, VSM (vibrating sample magnetometer) and ME (Mossbauer effect spectroscopy) investigations. A differential thermal analysis scan of an as-cast ribbon showed the presence of two exothermic peaks, the first beginning at 419.9°C and peaking at 429.7°C and the second beginning at 497.3°C and ending at 546.2°C. The XRD patterns of the ribbons showed the formation of FeNi 3 nanocrystallites in the lower T'a ribbons and (Fe, Ni, Mo) 23 B 6 crystallites in the ribbons annealed above 470°C. Different behaviors of the saturation magnetization were seen in the ribbons annealed between 400 and 450°C, between 450 and 490°C, and between 490 and 540°C. The ME spectra of the ribbons annealed in the three different temperature ranges also pointed to the presence of three crystalline Fe-compounds in these ranges. The XRD patterns and the coercivities (Hc) of the lower Ta ribbons point to the formation of nanocrystallites in these ribbons.

scholarly journals Synthesis and characterization of the Fe-Zn intermetallic phases using the Rietveld Method

2014 ◽  
Vol 67 (2) ◽  
pp. 181-184 ◽  
Author(s):  
Leandro de Arruda Santos ◽  
Leonardo Ulian Lopes ◽  
Paulo Antônio Pereira Wendhausen
Keyword(s):  
Reliable Method ◽  
Rietveld Method ◽  
Intermetallic Phases ◽  
Sintering Process ◽  
Mass Percentage ◽  
Xrd Pattern ◽  
Steel Sheets ◽  
Xrd Patterns ◽  
Galvannealed Steel

The Rietveld Method was used to investigate the structure of three Fe-Zn intermetallic phases and to quantify their proportion. The zeta, delta and gamma phases were successfully obtained by the sintering process. A simple mixture of the three intermetallic phases was made with a known mass percentage and the XRD pattern of this mixture was collected and analyzed by the Rietveld Method. A difference of 14% between the simulated and the experimental XRD patterns was found, indicating a satisfactory fitting. Slightly different lattice parameters from those given in the ICSD cards were observed. Because of the good fitting, the calculated phase percentages of the mixture agreed closely with the real ones. Thus, it was concluded that the Rietveld Method is a reliable method to quantify the phases in galvannealed steel sheets and the same methodology applied in this laboratorial study can be applied to industrial sheets.

Preparation and Magnetic Properties of La Substituted Barium Ferrites Synthesized by the Oxide one Pot Synthesis (OOPS) Process

2013 ◽  
Vol 634-638 ◽  
pp. 2250-2253 ◽  
Author(s):  
Sitthisak Sorlateap ◽  
Wirunya Keawwattana
Keyword(s):  
Magnetic Properties ◽  
Saturation Magnetization ◽  
Crystalline Structure ◽  
Coercive Field ◽  
Barium Ferrite ◽  
One Pot ◽  
Xrd Pattern ◽  
One Pot Synthesis ◽  
Ferrite Structure ◽  
Barium Ferrites

Lanthanum (La) substituted barium ferrite, Ba1-xLaxFe12O19(x=0.00-0.40) has been synthesized by the oxide one pot synthesis (OOPS) process. The crystalline structure and magnetic properties have been investigated by means of XRD, SEM and VSM. The XRD pattern matched with the barium ferrite structure. The saturation magnetization (Ms) and coercive field (Hc) of ferrites increased by substitution of La ions on Ba sites at the content up to x=0.15 and then decrease.

Structure and Magnetic Properties of BaLa0.5Fe11.5O19/ SiO2

2008 ◽  
Vol 368-372 ◽  
pp. 626-628 ◽  
Author(s):  
Zhi Dong Han ◽  
Li Min Dong ◽  
Ze Wu ◽  
Xian You Zhang
Keyword(s):  
Magnetic Properties ◽  
Saturation Magnetization ◽  
Sol Gel ◽  
Sio2 Nanoparticles ◽  
Nano Particles ◽  
Powder Size ◽  
Hexagonal Crystal ◽  
Method Effects ◽  
Diffraction Peaks ◽  
Xrd Patterns

The paper aims at synthesizing La substituted BaM hexaferrites (BaLa0.5Fe11.5O19) in the presence of SiO2 nano-particles by sol-gel method. Effects of SiO2 nano-particles on the structure and particle size of hexaferrites are investigated by XRD and SEM. Magnetic properties of BaFe12O19, BaLa0.5Fe11.5O19 and BaLa0.5Fe11.5xO19/SiO2 are compared by vibrating sample magnetometer (VSM). The XRD patterns of BaLa0.5Fe11.5O19/SiO2 calcined at 1000°C manifest that all the species have hexagonal crystal structure and no diffraction peaks of SiO2 are found. Compared with BaLa0.5Fe11.5O19 powders, those synthesized in the presence of SiO2 nanoparticles present in smaller powder size, as proved by SEM. The results of VSM reveal that BaLa0.5Fe11.5O19 possesses much higher saturation magnetization than BaFe12O19. BaLa0.5Fe11.5xO19/SiO2 also shows higher saturation magnetization than BaFe12O19, but lower than BaLa0.5Fe11.5O19 because of addition of nano-SiO2.

Hydrostatic Training and Characterization of near Stoichiometric Ni-Mn-Ga Alloy

2020 ◽  
Vol 835 ◽  
pp. 22-27
Author(s):  
Nour Mahmoud Eldabah ◽  
Saleh Mohammed Kayetbay ◽  
Mohammed A. Gepreel ◽  
Ahmed Mohamed El-Assal
Keyword(s):  
Magnetic Properties ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Stoichiometric Composition ◽  
Hydraulic Press ◽  
Ferromagnetic Shape Memory Alloys ◽  
Xrd Pattern ◽  
High Frequencies ◽  
Ferromagnetic Shape Memory

Shape memory alloys are programmed to memorize original trained shape. Ni-Mn-Ga is one of the ferromagnetic shape memory alloys. It is used as actuator, and sensor due to large output strain at high frequencies. This work presents a study on enhancing magnetic properties of thermally treated alloy by using new method of training in which alloys are exposed to different hydrostatic pressures using pressing die. Single near stoichiometric composition was produced. Elemental analysis showed homogeneity of the alloy. XRD pattern revealed Martensitic phase peaks. Transformation temperature was found to be below 100 OC. Training was applied by hydrostatic pressing die. Different training pressures were obtained using hydraulic press. After applying hydrostatic pressures starting from 2.5 bar to 10 bar, it was found that pressures up to 7.5 bar will increase the coercivity and saturation magnetization of the alloy, while pressures beyond 7.5 bar lessened these magnetic properties.

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