Microstructural and Magnetic Properties of Ti2+-Mn4+ Substituted Barium Hexaferrite

In this paper we report the microstructure and magnetic properties of Ti4+-Mn4+ ions substitued barium hexaferrites (BHF) with formula of BaFe12-2xMnxTixO19 (x = 0.2, 0.4, 0.6 and 0.8) which prepared by mechanical alloying and successive sintering at 1100 °C. Ti4+-Mn4+ ions were obtained from TiO2 and MnO precursors which were mechanically alloyed together with BaCO3 and Fe2O3 precursors. X-ray diffraction patterns for sintered samples confirmed that the materials are consisted with single phase BHF structure. Unit cell volume and crystallite size was found increase with increasing x. The crystallite size for all samples was below 70 nm, but microstructure observation shown that the particle size is in range of 200 - 400 nm, which concluded that the grains are polycrystalline. The saturation magnetization is increases up to x = 0.4 and decrease for higher x values, while the coercivity remain decreases monotonically. These results were interpreted in terms of the site preferential occupation of Ti2+ and Mn4+ at low level substitution.

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Microstructures, Magnetic Properties and Microwave Absorption Characteristics of Ti2+ -Mn4+Substituted Barium Hexaferrite

Jurnal Elektronika dan Telekomunikasi ◽

10.14203/jet.v14.15-19 ◽

2016 ◽

Vol 14 (1) ◽

pp. 15 ◽

Cited By ~ 1

Author(s):

Maykel Manawan ◽

Azwar Manaf ◽

Bambang Soegijono ◽

Asep Yudi Hercuadi

Keyword(s):

Crystallite Size ◽

Microwave Absorption ◽

Single Phase ◽

Barium Hexaferrite ◽

Grain Morphology ◽

X Ray Diffraction ◽

Mechanically Alloyed ◽

X Ray ◽

Xrd Patterns ◽

Substituted Barium Hexaferrite

The effect of Ti2+-Mn4+substitution on microwave absorption has been studied for BaFe12-2xTixMnxO19 ferrite, where x varies from 0.2, 0.4, 0.6 and 0.8.Ti2+-Mn4+ ions were obtained from TiO and MnO2 precursors which were mechanically alloyed together with BaCO3 and Fe2O3 precursors. X-ray diffraction (XRD) patterns for sintered samples confirmed that the materials are consisted with single phase BHF structure. Unit cell volume and crystallite size was found increase with increasing x. Crystallite size for all samples below 70 nm, but the grain morphology shown that the grains is in range of 200 - 400 nm, which concluded that each grain are polycrystalline. The saturation magnetization is increases up to x = 0.4 and decrease for higher x values, while the coercivity remains decreases monotonically. These results were interpreted in terms of the site preferential occupation of Ti2+ and Mn4+ at low level substitution.These substitution revealed of enhanced reflection loss (RL) up to 25 dB forx=0.6.It suggested that the synthesized can be employed as effective microwave absorbers in various devices.

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Ferromagnetic Order in the Intermetallic Alloys laNi5-xMgx

ASEAN Journal on Science and Technology for Development ◽

10.29037/ajstd.49 ◽

2012 ◽

Vol 29 (1) ◽

pp. 50

Author(s):

D.N Ba ◽

L.T Tai ◽

N.T Trung ◽

N.T Huy

Keyword(s):

Magnetic Properties ◽

Curie Temperature ◽

Room Temperature ◽

Single Phase ◽

Chemical Doping ◽

Intermetallic Alloys ◽

X Ray Diffraction ◽

X Ray ◽

Ferromagnetic Order ◽

Diffraction Patterns

The influences of the substitution of Ni with Mg on crystallographic and magnetic properties of the intermetallic alloys LaNi5-xMgx (x ≤ 0.4) were investigated. The X-ray diffraction patterns showed that all samples were of single phase, and the lattice parameters, a and c, decreased slightly upon chemical doping. LaNi5 is well known as an exchange-enhanced Pauli paramagnet. Interestingly, in LaNi5-xMgx, the ferromagnetic order existed even with a small amount of dopants; the Curie temperature reached the value of room temperature for x = 0.2, and enhanced with increasing x.

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EFFECT OF PYRIDINE INTERCALATION ON SEMICONDUCTOR CRYSTALLINE MnPS3 MATERIALS PHASE TRANSFORMATION

International Journal of Nanoscience ◽

10.1142/s0219581x10006612 ◽

2010 ◽

Vol 09 (03) ◽

pp. 215-223 ◽

Cited By ~ 1

Author(s):

A. A. EL-MELIGI ◽

A. M. AL-SAIE ◽

H. AL-BUFLASA ◽

M. BOUOUDINA

Keyword(s):

Magnetic Properties ◽

Phase Transformation ◽

Crystallite Size ◽

Inorganic Compounds ◽

Semiconductor Material ◽

X Ray Diffraction ◽

X Ray ◽

Crystalline Semiconductor ◽

Diffraction Patterns ◽

Three Phases

The crystalline semiconductor material (MnPS3) has interlayer d-spacing gap of 6.4 Å. The main advantage of this gap is the ability to accommodate organic and inorganic compounds. Pyridine was intercalated in the MnPS3 interlayer gap under specific conditions. Four phases (d-spacing = 12.48 Å, 10.8 Å, 9.7 Å and 7.3 Å) were observed and the corresponding lattice expansions were determined, 5.8 Å, 4.4 Å, 3.3 Å and 1 Å, respectively. X-ray diffraction patterns of the samples after the experiment were stopped to reveal the presence of three phases together. The phase transformation occurred for the aforementioned phases. The crystallite size of certain phases is within nanorange. The magnetic properties of the materials are affected by the phase transformation. Complete intercalation was confirmed by the XRD and infrared (IR) measurements.

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Microstructure and magnetic properties of NdFeB/Mo multilayered films prepared by magnetron sputtering

Modern Physics Letters B ◽

10.1142/s0217984916501268 ◽

2016 ◽

Vol 30 (08) ◽

pp. 1650126

Author(s):

Yudong Fu ◽

Feng Yan ◽

Xiaoshuo Zhu ◽

Xiaoxue Feng ◽

Zaizai Guo

Keyword(s):

Magnetic Properties ◽

Magnetron Sputtering ◽

Cross Section ◽

Multilayer Structure ◽

Remanent Magnetization ◽

X Ray Diffraction ◽

Multilayered Films ◽

X Ray ◽

Diffraction Patterns ◽

Microstructure And Magnetic Properties

The paper was presented to study the microstructure and magnetic properties of Mo/[NdFeB/Mo] × 10/Mo multilayered films prepared by magnetron sputtering on Si(100) substrate. The SEM observation of microstructure showed that the specimen had fine multilayer structure and the NdFeB layers were successfully separated by Mo layers on the cross-section. The interface between the NdFeB and Mo layer disappeared after annealing. X-ray diffraction patterns of the annealed films revealed that there are a large amount of Nd2Fe[Formula: see text]B phases. The thickness of Mo layer had obvious effects on magnetic properties of the samples. When it reached 21 nm, the number and the intensity of NdFeB phase increase, and the remanent magnetization ratio Mr/Ms suddenly rise. The influences of annealing on surface morphology and microstructure of NdFeB thin films were also studied.

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Structure and Magnetic Properties of Ternary Nanosized FeAlSn and CuFeCo Powders Synthesized by Mechanical Milling

Journal of Nano Research ◽

10.4028/www.scientific.net/jnanor.47.79 ◽

2017 ◽

Vol 47 ◽

pp. 79-88 ◽

Cited By ~ 2

Author(s):

Z. Hamlati ◽

W. Laslouni ◽

Mohammed Azzaz ◽

M. Zergoug ◽

D. Martínez-Blanco ◽

...

Keyword(s):

Magnetic Properties ◽

Crystallite Size ◽

Milling Time ◽

Magnetic Measurements ◽

High Energy ◽

X Ray Diffraction ◽

Mechanically Alloyed ◽

High Energy Ball Mill ◽

Powder Particles ◽

Energy Ball

Ternary Fe72Al26Sn2 and Cu70Fe18Co12 alloys were obtained by mechanical alloying of pure Fe, Al, Sn, Cu and Co powders using a high energy ball mill. X-ray diffraction and electron microscopy supported by magnetic measurements have been applied to follow changes in the microstructure, phase composition and magnetic properties in dependence on milling time. With the increase of milling time all Al and Sn atoms dissolved in the bcc Fe and the final product of the MA process was the nanocrystalline Fe (Al, Sn) solid solution in a metastable state with a large amount of defects and mean crystallite size of 5 nm. However, the obtained crystallite size value is about 10 nm for the ball milled Cu70Fe18Co12 powders. The electron microscope observations show the morphology of powder particles. Magnetic properties of the nanocrystalline mechanically alloyed FeAlSn and CuFeCo were also investigated and were related to the microstructural changes.

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

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.1025-1026.440 ◽

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.

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Effect of Co-Ti Substitution on Magnetic Properties of Nanocrystalline BaFe12O19

KnE Engineering ◽

10.18502/keg.v0i0.506 ◽

2016 ◽

Vol 1 (1) ◽

Author(s):

Erfan Handoko

Keyword(s):

Magnetic Properties ◽

Single Phase ◽

Solid State Reaction Method ◽

X Ray Diffraction ◽

Polycrystalline Structure ◽

Reaction Method ◽

X Ray ◽

Ti Substitution ◽

Scanning Electron ◽

Microstructure And Magnetic Properties

The synthesis of nanocrystalline BaFe12-2xCoxTixO19 with variations of x (x = 0, 1, 2, and 3) have been investigated. The formation of polycrystalline samples that the cationic of Co2+ and Ti4+ in Co-Ti substituted Fe in BaFe12O19 ferrites structure were prepared by solid state reaction method. The crystal structure, microstructure, and magnetic properties were characterized using powder X-ray diﬀraction, scanning electron microscope (SEM) and permagraph meter, respectively. The results show that the nanocrystalline BaFe12-2xCoxTixO19 has single phase with polycrystalline structure, the grain size decrease by doping, the coercivity (Hc) and saturation magnetization (Ms) decrease with increasing Co-Ti substitutions.

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Microstructure and Magnetic Properties of Barium Hexaferrite Produced by Sol Gel Auto Combustion for Radar Absorber Material (RAM) Application

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.493.656 ◽

2014 ◽

Vol 493 ◽

pp. 656-660 ◽

Cited By ~ 3

Author(s):

Widyastuti ◽

Endah Kharismawati ◽

M. Zainuri ◽

Hosta Ardhyananta

Keyword(s):

Magnetic Properties ◽

High Performance ◽

Sol Gel ◽

Barium Hexaferrite ◽

Hexagonal Structure ◽

X Ray Diffraction ◽

Absorber Material ◽

Auto Combustion ◽

Stirring Time ◽

Microstructure And Magnetic Properties

Barium hexaferrite (BaFe12O19) with hexagonal structure has been known as the high performance magnetic for Radar Absorber Material (RAM). Barium hexaferrite (BaM) was synthesized by sol gel auto combustion to get an homogeneous nanoparticle of BaM. Barium hexaferrites obtained from solution mixture between barium nitrate and ferri nitrate nonahidrat with precipitation of ion barium (Ba2 +) and ferri (Fe3 +) by solution of sodium hydroxide. Sample prepared with mol ratio of Fe / Ba 11 then added ammoniac in order that pH varies become 7,5; 9; and 11. Citric acid added in order that happen process of combustion. The stirring time was varieties by 1, 2, 3 hours. The effect of pH, stirring time, microstructure, phase,and magnetic properties were investigated using X-ray diffraction (XRD), Scanning Electron Microscope (SEM) and a vibrating sample magnetometer (VSM). The results showed that the highest coercivity was 0.6 Tesla and the smallest crystal size 414.409 nm was obtained for pH 7.5 and stirring time 2 hours. The largest magnetic saturation 55.54 emu /g was reached for pH 7.5 with stirring time 1 hour

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Effect of Co-Ti Substitution on Magnetic Properties of Nanocrystalline BaFe12O19

KnE Engineering ◽

10.18502/keg.v1i1.506 ◽

2016 ◽

Vol 1 ◽

Author(s):

Erfan Handoko

Keyword(s):

Magnetic Properties ◽

Single Phase ◽

Solid State Reaction Method ◽

X Ray Diffraction ◽

Polycrystalline Structure ◽

Reaction Method ◽

X Ray ◽

Ti Substitution ◽

Scanning Electron ◽

Microstructure And Magnetic Properties

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Structural and Magnetic Hysteresis Properties of Co-Zr Substituted Hexagonal Barium Ferrites

JOURNAL OF ADVANCES IN PHYSICS ◽

10.24297/jap.v7i1.1739 ◽

2015 ◽

Vol 7 (1) ◽

pp. 1346-1351

Author(s):

Ch.Gopal Reddy ◽

Ch. Venkateshwarlu ◽

P. Vijaya Bhasker Reddy

Keyword(s):

Magnetic Properties ◽

Single Phase ◽

Magnetic Hysteresis ◽

Grain Morphology ◽

Hexagonal Structure ◽

Ion Composition ◽

X Ray Diffraction ◽

Ceramic Method ◽

Barium Ferrites ◽

Xrd Patterns

Co-Zr substituted M-type hexagonal barium ferrites, with chemical formula BaCoxZrxFe12-2xO19 (where x = 0.0, 0.2, 0.4, 0.6, 0.8 and 1.0), have been synthesized by double sintering ceramic method. The crystallographic properties, grain morphology and magnetic properties of these ferrites have been investigated by X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Vibrating Sample Magnetometer (VSM). The XRD patterns confirm the single phase with hexagonal structure of prepared ferrites. The magnetic properties have been investigated as a function of Co and Zr ion composition at an applied field in the range of 20 KOe. These studies indicate that the saturation magnetization (Ms) in the samples increases initially up to the Co-Zr composition of x=0.6 and decreases thereafter. On the other hand, the coercivity (Hc) and Remanent magnetization (Mr) are found to decrease continuously with increasing Co-Zr content. This property is most useful in permanent magnetic recording. The observed results are explained on the basis of site occupation of Co and Zr ions in the samples.

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