X-ray diffraction studies on aluminum-substituted barium hexaferrite

2004 ◽  
Vol 58 (7-8) ◽  
pp. 1147-1153 ◽  
Author(s):  
D. Mishra ◽  
S. Anand ◽  
R.K. Panda ◽  
R.P. Das
Keyword(s):  
Barium Hexaferrite ◽  
X Ray Diffraction ◽  
X Ray ◽  
Substituted Barium Hexaferrite

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

2016 ◽  
Vol 14 (1) ◽  
pp. 15 ◽  
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.

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.

scholarly journals Исследование особенностей состава, магнитной и кристаллической структуры гексаферрита бария BaFe-=SUB=-12-x-=/SUB=-Ti-=SUB=-x-=/SUB=-O-=SUB=-19-=/SUB=-

2020 ◽  
Vol 62 (5) ◽  
pp. 789
Author(s):  
В.В. Коровушкин ◽  
А.В. Труханов ◽  
В.Г. Костишин ◽  
И.М. Исаев ◽  
И.В. Щетинин ◽  
...  
Keyword(s):  
Mössbauer Spectroscopy ◽  
Mossbauer Spectroscopy ◽  
Barium Hexaferrite ◽  
Partial Substitution ◽  
Isomorphic Substitution ◽  
Charge Balance ◽  
X Ray Diffraction ◽  
X Ray ◽  
Mößbauer Spectroscopy ◽  
Substituted Barium Hexaferrite

The results of studies of the composition, crystal, and magnetic structure of Ti-substituted barium hexaferrite BaFe12 - xTixO19 (0.25<x<1.5) by Mössbauer spectroscopy, vibration magnetometry, X-ray diffraction, and synchronous thermal analysis are presented. Partial substitution of Fe3 + ions by Ti4 + ions revealed the presence of a limited heterovalent isomorphism realized according to the 2Fe3+ = Ti4+ + Fe2+ while maintaining charge balance. Using Mössbauer spectroscopy, an increase in the electron density of 3d electrons and the presence of Fe2+ in BaFe12 - xTixO19 samples with x = 1.5 were established. The limit of heterovalent isomorphic substitution is established, which is in the range 0.75 <x <1.0. Using Mössbauer spectroscopy and X-ray diffraction, the formation of titanium-containing phases at x = 1, 0, the content of which increases with increasing degree of substitution, is shown. Information is provided on the predominant distribution of substituent ions (Ti4+) in the structure of barium hexaferrite at positions 12k and 2b.

Magnetic Losses in Thick Barium-Hexaferrite Films on MgO (111)

2000 ◽  
Vol 656 ◽  
Author(s):  
S.D. Yoon ◽  
S.A. Oliver ◽  
P. Shi ◽  
X. Zuo ◽  
C. Vittoria
Keyword(s):  
Barium Hexaferrite ◽  
Film Plane ◽  
Substrate Thickness ◽  
Magnetic Losses ◽  
Vibrating Sample Magnetometry ◽  
X Ray Diffraction ◽  
X Ray ◽  
Torque Magnetometry ◽  
The Magnetic Field ◽  
Scanning Electron

ABSTRACTBarium hexaferrite films having thickness from 3 to 30 μm were deposited onto 0.5 mm Magnesium Oxide (111) substrates, and were examined by vibrating sample magnetometry, torque magnetometry, x-ray diffraction, and scanning electron microscope measurements. Ferrimagnetic resonance measurements were taken with the magnetic field applied perpendicular to the film plane. The FMR linewidth values for as-produced 3 - 30 μm films was 0.45 - 0.70 kOe, and was reduced to 0.06 - 0.45 kOe after annealing at 1000 °C for 2 hours. Further annealing increased the linewidth. The FMR linewidth for the 30 μm thick film was also found to decrease upon mechanically removing 55 ∼ 77 % of the substrate thickness. A 6-fold in-plane anistropy symmetry in the anisotropy energy was observed in torque magnetometry measurements for films thicker than 30 μm. These results can be interpreted as due to film inhomogeneity, stress, and the growth of small regions of non c-axis textured material.

scholarly journals Long Time Stability Investigation for Structural and Magnetic Properties of Ti-doped Barium Ferrite

2019 ◽  
Vol 3 (2) ◽  
pp. 53-57
Author(s):  
Mohammed Abdul Malek Al Saadi
Keyword(s):  
Magnetic Properties ◽  
Room Temperature ◽  
Structural Characteristics ◽  
Barium Hexaferrite ◽  
Ambient Conditions ◽  
X Ray Diffraction ◽  
Storage Process ◽  
X Ray ◽  
Air Atmosphere ◽  
Long Time

Barium hexaferrite (BHF) (BaFe12O19) and its substituted derivatives have been considered as the most potential magnetic candidates with considerable chemical stability and physiochemical characteristics. BHF with x ferrite ions substituted by titanium (Ti-doped BTHF) (BaTixFe12-xO19) (x=1 and x=3) was prepared from ferric oxide (Fe2O3), barium oxide (BaO), and titanium oxide (TiO2) of purity >98%. The materials were mixed with deionized water and then dried at 1100°C and 1200°C overnight. For the formation of BaFe12O19 phase, the mixture was annealed at a rate of 10°C/min in static air atmosphere until reaching 1200°C and then maintained for 10 h. Structural properties of these samples were measured using X-ray diffraction (XRD) and scanning electron microscopy, while magnetic properties were measured using vibrating sample magnetometer (VSM) device. Magnetic and structural characteristics are investigated after preserving Ti-doped BHF samples at room temperature and ambient conditions for 12 years. The samples are characterized using the same previous techniques to find out the possible effect of long period storage on their properties. The results showed that the storage process has little effect on these properties where the granular size increased due to increased oxidation. XRD tests also showed the absence of Ti at low ratios due to increased oxidation of ferrite. VSM results showed increased magnetic properties after storage due to increased iron oxide.

Variations in the synthesis of barium hexaferrite doped with iridium and its effect in the catalytic combustion of hydrocarbons

1998 ◽  
Vol 13 (6) ◽  
pp. 1637-1643 ◽  
Author(s):  
A. C. Pierre ◽  
A. Favre ◽  
N. Guilhaume
Keyword(s):  
Porous Structure ◽  
Catalytic Combustion ◽  
Catalytic Properties ◽  
Barium Hexaferrite ◽  
Metal Salts ◽  
X Ray Diffraction ◽  
X Ray ◽  
Heat Treated ◽  
Bet Analysis ◽  
Structure Phase

This paper discusses the influence of the synthesis technique on the porous structure, phase transformation, and catalytic properties of barium hexaferrite. Barium hexaferrite was synthesized by two different citrate gel methods. The first one involved metal salts, citric acid, and ammonia, while the second dispersed the same components in a polyacrylamide gel. X-ray diffraction analysis was used to determine the nature of the phase while the Brunauer, Emmett, and Teller (BET) analysis was used to study the porous structure of the material which were heat-treated at 700 °C, 900 °C, and 1200 °C. The catalytic activity of all materials in the combustion of methane was also measured.

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

2014 ◽  
Vol 896 ◽  
pp. 401-405 ◽  
Author(s):  
Maykel Manawan ◽  
Azwar Manaf ◽  
Bambang Soegijono ◽  
Asep Yudi
Keyword(s):  
Magnetic Properties ◽  
Crystallite Size ◽  
Single Phase ◽  
Barium Hexaferrite ◽  
X Ray Diffraction ◽  
Mechanically Alloyed ◽  
Microstructure Observation ◽  
Diffraction Patterns ◽  
Substituted Barium Hexaferrite ◽  
Microstructure And Magnetic Properties

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.

scholarly journals Effect of Ratio in Ammonium Nitrate on the Structural, Microstructural, Magnetic, and AC Conductivity Properties of BaFe12O19

Materials ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 2190 ◽  
Author(s):  
Raba’ah Azis ◽  
Nor Che Muda ◽  
Jumiah Hassan ◽  
Abdul Shaari ◽  
Idza Ibrahim ◽  
...  
Keyword(s):  
Ammonium Nitrate ◽  
Ac Conductivity ◽  
Heating Temperature ◽  
Weight Ratio ◽  
Barium Hexaferrite ◽  
X Ray Diffraction ◽  
X Ray ◽  
Infra Red ◽  
The Fourier Transform ◽  
Sample Ratio

This paper investigates the effect of the ratio of ammonium nitrate (AN) on the structural, microstructural, magnetic, and alternating current (AC) conductivity properties of barium hexaferrite (BaFe12O19). The BaFe12O19 were prepared by using the salt melt method. The samples were synthesized using different powder-to-salt weight ratio variations (1:3, 1:4, 1:5, 1:6 and 1:7) of BaCO3 + Fe2O3 and ammonium nitrate salt. The NH4NO3 was melted on a hot plate at 170 °C. A mixture of BaCO3 and Fe2O3 were added into the NH4NO3 melt solution and stirred for several hours using a magnetic stirrer under a controlled temperature of 170 °C. The heating temperature was then increased up to 260 °C for 24 hr to produce an ash powder. The x-ray diffraction (XRD) results show the intense peak of BaFe12O19 for all the samples and the presence of a small amount of the impurity Fe2O3 in the samples, at a ratio of 1:5 and 1:6. From the Fourier transform infra-red (FTIR) spectra, the band appears at 542.71 cm − 1 and 432.48 cm − 1 , which corresponding to metal–oxygen bending and the vibration of the octahedral sites of BaFe12O19. The field emission scanning electron microscope (FESEM) images show that the grains of the samples appear to stick each other and agglomerate at different masses throughout the image with the grain size 5.26, 5.88, 6.14, 6.22, and 6.18 µm for the ratios 1:3, 1:4, 1:5, 1:6, and 1:7 respectively. From the vibrating sample magnetometer (VSM) analysis, the magnetic properties of the sample ratio at 1:3 show the highest value of coercivity Hc of 1317 Oe, a saturation magnetization Ms of 91 emu/g, and a remnant Mr of 44 emu/g, respectively. As the temperature rises, the AC conductivity is increases with an increase in frequency.

BARIUM HEXAFERRITE THICK FILMS BY HOT PRESS SINTERING

2010 ◽  
Vol 24 (06) ◽  
pp. 561-566 ◽  
Author(s):  
H. C. JIANG ◽  
W. L. ZHANG ◽  
Y. HE ◽  
B. PENG ◽  
W. X. ZHANG
Keyword(s):  
Easy Axis ◽  
Thick Films ◽  
Barium Hexaferrite ◽  
Film Plane ◽  
Hot Press ◽  
X Ray Diffraction ◽  
X Ray ◽  
Remanence Ratio ◽  
Magnetic Easy Axis ◽  
Hot Press Sintering

BaFe 12 O 19 ferrite thick films were screen-printed and sintered at 1150°C under pressure (hot press sintering). The effects of the hot press sintering on the properties of barium hexaferrite thick films were investigated. The X-ray diffraction pattern shows improvement of the (00l) texture under pressure. The porosity size of the hot press sintering samples decreases obviously and the surface compactness is improved as the pressure is increased. The films are quite anisotropic with magnetic easy axis perpendicular to the film plane. The largest remanence ratio achieved is 0.75 under the highest pressure of 4 MPa.

Substituted Barium Hexaferrite Films for Planar Integrated Phase Shifters

1999 ◽  
Vol 603 ◽  
Author(s):  
S.A. Oliver ◽  
S.D. Yoon ◽  
I. Kozulin ◽  
P. Shi ◽  
X. Zuo ◽  
...  
Keyword(s):  
Integrated Circuits ◽  
Magnetic Measurements ◽  
Barium Hexaferrite ◽  
Film Plane ◽  
Phase Shifters ◽  
X Ray Diffraction ◽  
Microwave Integrated Circuits ◽  
Torque Magnetometry ◽  
Substituted Barium Hexaferrite ◽  
Dense Films

AbstractThick films of scandium-substituted BaScxFe12−xO19 (x=0, 0.4, 0.6) were deposited by pulsed laser ablation deposition onto A-plane (1120) sapphire (Al2O3) substrates to yield highly oriented films having the crystallographic c-axis ([0001]) in the film plane. Selected films were characterized by x-ray diffraction, electron microscopy, magnetometry and torque magnetometry measurements. These structural and magnetic measurements show that dense films have excellent in-plane uniaxial anisotropies and good square loop behaviors. Such films will be useful for planar latched phase shifters that can be integrated into microwave integrated circuits.

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