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.

Study the Effect of the Substitution of Ba with Pr in Barium Ferrite Powder on Magnetic Properties

2014 ◽  
Vol 1025-1026 ◽  
pp. 440-444
Author(s):  
Pornpen Marawichayo ◽  
Wirunya Keawwattana ◽  
Nattamon Koonsaeng ◽  
Pongsakorn Jantaratana
Keyword(s):  
Magnetic Properties ◽  
Coercive Field ◽  
Barium Ferrite ◽  
Barium Hexaferrite ◽  
Ferrite Powder ◽  
X Ray Diffraction ◽  
One Pot ◽  
X Ray ◽  
Saturation Magnetisation ◽  
Substituted Barium Hexaferrite

Pr substituted barium hexaferrite, Ba1-xPrxFe12O19 with x = 0.00-0.20 were synthesized by Oxide One Pot Synthesis (OOPS) process. The phase composition of Ba1-xPrxFe12O19 were characterized by X-ray diffraction analysis (XRD). The phase morphology of the barium hexaferrite powder was studied by scanning electron microscope (SEM) and energy dispersive X-ray (EDX) spectroscopy confirmed that the Pr completely substituted into barium ferrite. The magnetic properties was investigated by vibrating sample magnetometry (VSM). It was found that saturation magnetisation and coercive field can be improved by the substitution of Ba with Pr in BaFe12O19 powder. The saturation magnetisation increased at first to the maximum of 50 emu g-1 (x = 0.15) and then decreased to the 34 emu g-1 (x = 0.20), while the coercive field increased remarkably with increasing Pr ions content.

Influence of the Laser Repetition Rate on Crystalline Structure, Composition and Magnetic Properties of Laser Deposited Y3Fe5O12/Gd3Ga5O12(111) Films

2002 ◽  
Vol 720 ◽  
Author(s):  
S. Kahl ◽  
V.P. Denysenkov ◽  
S.I. Kranzusch ◽  
A.M. Grishin
Keyword(s):  
Surface Roughness ◽  
Magnetic Properties ◽  
Crystalline Structure ◽  
Coercive Field ◽  
Repetition Rate ◽  
The Other ◽  
Laser Deposition ◽  
Laser Repetition Rate ◽  
Experimental Parameters ◽  
Annealing Experiments

AbstractY3Fe5O12 (YIG) films have been deposited onto single crystal Gd4Ga5O12(GGG) substrates by publsed laser deposition. For a given set of experimental parameters, the oxygen background pressure and substrate tempetature were optimized to achieve the narrowest ferromagnetic resonance (FMR) lines. The repetition rate was then varied from 10 to 50 Hz. There is a cleasr transition from films with low saturation magnetization 4πMs ≈ 300 Gs, high coercive fields Hc > 20 Oe, and broad FMR lines ΔH > 100 Oe to films with 4πMs ≈ 1400Gs, Hc < 10 Oe, and ΔH ≤ 10 Oe. This crossover occurs when the laser repetition rate is changed from 20 to 30 Hz. No significant differences could be detected in any of the other investigated properties: crystalline structure, cation concentration rastio, amd surface roughness do not depend on the repetition rate. Annealing experiments show that the films deposited at 10 and 20 Hz repetition rate are oxygen deficent. We loaded the film deposited at 20 Hz with oxygen, so that it reached the bulk value for 4πMs. The coercive field, however, remained large.

One-pot synthesis of size- and morphology-controlled 1-D iron oxide nanochains with manipulated magnetic properties

2014 ◽  
Vol 50 (2) ◽  
pp. 201-203 ◽  
Author(s):  
Qingliang He ◽  
Tingting Yuan ◽  
Xingru Yan ◽  
Zhiping Luo ◽  
Neel Haldolaarachchige ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Iron Oxide ◽  
One Pot ◽  
One Pot Synthesis ◽  
Size And Morphology

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.

ONE-POT SYNTHESIS OF HYDROPHILIC AND HYDROPHOBIC FERROFLUID

2009 ◽  
Vol 08 (01n02) ◽  
pp. 65-69 ◽  
Author(s):  
DIPAK MAITY ◽  
JUN DING ◽  
JUN-MIN XUE
Keyword(s):  
Magnetic Properties ◽  
Ethylene Glycol ◽  
Direct Synthesis ◽  
Blocking Temperature ◽  
High Quality ◽  
One Pot ◽  
Single Crystalline ◽  
Stabilizing Agent ◽  
One Pot Synthesis ◽  
Tga Analysis

High-quality hydrophobic or hydrophilic ferrofluid based on magnetite ( Fe 3 O 4) nanoparticles can be synthesized by one-pot direct synthesis which involves thermolysis of Iron(III) acetylacetonate, Fe ( acac )3 in hydrophobic or hydrophilic stabilizing agent, respectively. The structure of the nanoparticles dispersed in the ferrofluid was studied using XRD, FTIR, XPS, and TGA analysis, while morphology and size of the nanoparticles were determined by TEM. The magnetic properties of the samples were measured using VSM and SQUID measurement. The results show that oleylamine (OM) and tri(ethylene glycol) (TREG) coated Fe 3 O 4 nanoparticles which are well stabilized in hydrophobic and hydrophilic ferrofluid, respectively, are relatively monodisperse, single crystalline and superparamagnetic in nature with the blocking temperature at around 100 K.

Influence of Bi2O3 on the Structure and Magnetic Properties of Barium Ferrite Powders Materials

2012 ◽  
Vol 499 ◽  
pp. 31-34
Author(s):  
Jie Li ◽  
Huai Wu Zhang ◽  
Yuan Xun Li ◽  
Hua Su ◽  
Yan Bing Ma
Keyword(s):  
Magnetic Properties ◽  
Barium Ferrite ◽  
Annealing Treatment ◽  
Solid State Reaction Method ◽  
Liquid Phase Sintering ◽  
Reaction Method ◽  
Sintering Additive ◽  
Barium Ferrites ◽  
Order Of Magnitude ◽  
Magnitude Increase

In this study, influence of Bi2O3on the structure and magnetic properties of barium ferrites has been studied in samples performed by using the solid-state reaction method. Samples, prepared with different amount of sintering additive are sintered at temperatures from 850°C to 950°C. The scanning electron microscope micrographs shows that the samples with 3wt% additive, calcinated at 900°C, have a particle size smaller than 1μm. Annealing treatment in air at 950°C led to an order-of-magnitude increase of the saturation magnetization of 60.42emu/g and coercive force of 4150.5Oe, which are due to the liquid phase sintering mechanism and the increasing grain size.

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