Comparative Study on Mn-Zn Ferrites by One-Step Synthesis and Conventional Two-Step Synthesis

2010 ◽  
Vol 177 ◽  
pp. 260-263 ◽  
Author(s):  
Qing Kai Xing ◽  
Zhi Jian Peng ◽  
Xiu Li Fu ◽  
Zhi Qiang Fu ◽  
Cheng Biao Wang ◽  
...  
Keyword(s):  
Magnetic Hysteresis ◽  
Initial Permeability ◽  
Synthesis Methods ◽  
Vibrating Sample Magnetometer ◽  
X Ray Diffraction ◽  
X Ray ◽  
Magnetic Performance ◽  
One Step ◽  
The Difference ◽  
The One

Mn-Zn ferrites doped with Cr3+ were prepared by “one-step synthesis” and conventional two-step synthesis methods, respectively. Their phase compositions and microstructures were characterized by X-ray diffraction and scanning electron microscopy, respectively. And their magnetic magnetic performance, such as saturation magnetization (Ms), magnetic hysteresis, initial permeability μi and power loss were comparatively investigated by vibrating sample magnetometer. It was observed that the difference of magnetic performance of the samples prepared by both methods is little. The similar performance of both methods makes the “one-step synthesis” especially attractive for application when considering energy economization.

Sonochemical Co-Precipitation Synthesis of Gallic Acid-Modified Magnetite

2015 ◽  
Vol 1101 ◽  
pp. 286-289 ◽  
Author(s):  
Maya Rahmayanti ◽  
Sri Juari Santosa ◽  
Sutarno
Keyword(s):  
Magnetic Properties ◽  
Gallic Acid ◽  
Precipitation Method ◽  
Vibrating Sample Magnetometer ◽  
X Ray Diffraction ◽  
X Ray ◽  
One Step ◽  
The Fourier Transform ◽  
The One ◽  
Co Precipitation

Gallic acid-modified magnetites were synthesized by one and two-step reactions via the newly developed sonochemical co-precipitation method. The two-step reaction included the formation of magnetite powder and mixing the magnetite powder with gallic acid solution, while the one-step reaction did not go through the formation magnetite powder. The obtained gallic acid-modified magnetites were characterized by the Fourier Transform Infrared (FTIR) spectroscopy, the X-Ray Diffraction (XRD) and the Scanning Electron Microscopy (SEM). More over, the magnetic properties were studied by using a Vibrating Sample Magnetometer (VSM). The characterization results showed that there were differences in crystalinity, surface morphology and magnetic properties of products that were formed by one and two-step reactions.

Preparation of nanocellulose by hydrolysis with ionic liquids and two-step hydrolysis with ionic liquids and enzymes

2021 ◽  
Vol 116 ◽  
pp. 5-14
Author(s):  
Marta Babicka ◽  
Magdalena Woźniak ◽  
Kinga Szentner ◽  
Sławomir Borysiak ◽  
Krzysztof Dwiecki ◽  
...  
Keyword(s):  
Ionic Liquids ◽  
Degree Of Crystallinity ◽  
Cellulolytic Enzyme ◽  
X Ray Diffraction ◽  
Production Methods ◽  
Step Process ◽  
X Ray ◽  
One Step ◽  
Xrd Patterns ◽  
The One

The aim of this study was to compare parameters of nanocellulose obtained by two different procedures: hydrolysis with ionic liquids (1-allyl-3-methylimidazolium chloride and 1-ethyl-3-methylimidazolium acetate) and hydrolysis with ionic liquids in combination with hydrolysis using a cellulolytic enzyme from Trichoderma reesei. Avicel cellulose was treated with two ionic liquids: 1-allyl-3-methylimidazolium chloride (AmimCl) and 1-ethyl 3-methylimidazolium acetate (EmimOAc). In the two-step hydrolysis cellulose after treatment with ionic liquids was additionally hydrolyzed with a solution of enzymes. In order to characterize the obtained material, the following analyses were used: infrared spectroscopy, X-ray diffraction and dynamic light scattering. The results indicated that cellulose obtained by two-step nanocellulose production methods (first hydrolysis with ionic liquids and then with enzymes) showed similar parameters (particle size, XRD patterns and degree of crystallinity) as the material after the one-step process, i.e. hydrolysis with ionic liquids.

Estimation of The Critical Radius for The Nucleation of the C54 Phase in C49 TiSi2: Role of The Difference in Density

1999 ◽  
Vol 580 ◽  
Author(s):  
D.B. Migas ◽  
M. Iannuzzi ◽  
Leo Miglio ◽  
F. La Via ◽  
M.G. Grimaldi
Keyword(s):  
Ab Initio ◽  
Elastic Strain ◽  
Critical Radius ◽  
Lattice Parameters ◽  
X Ray Diffraction ◽  
X Ray ◽  
The Difference ◽  
Two Phases ◽  
The One

AbstractWe discuss the rather scattered measurements of the lattice parameters for C49 TiSi2, which are reported in literature, along with new and accurate X-ray diffraction measurements and ab-initio calculations. Both agree in indicating that the density of the metastable C49 structure cannot be much smaller than the one for the polymorphic C54 phase, as it is commonly reported. We conclude by demonstrating that only in the case of such a smaller difference in density between the two phases, the elastic strain contribution to the nucleation energy of the C54 structure in the C49 matrix can be neglected. The estimation of the critical radius strongly depends on this issue.

Influence of Zinc-Zirconium Substitution on Magnetic Properties of Ba(ZnZr)xFe12-2xO19 Hexaferrite Prepared by the Molten Salt Method

2009 ◽  
Vol 79-82 ◽  
pp. 2071-2074 ◽  
Author(s):  
Hai Feng Li ◽  
Rong Zhou Gong ◽  
Xian Wang ◽  
Li Ren Fan ◽  
Gang He ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Molten Salt ◽  
Magnetic Hysteresis ◽  
Magnetic Hysteresis Loop ◽  
Chemical Compositions ◽  
Molten Salt Method ◽  
Vibrating Sample Magnetometer ◽  
Hexagonal Ferrites ◽  
X Ray Diffraction ◽  
X Ray

M-type hexaferrites Ba(ZnZr)xFe12-2xO19 (x=0, 0.5, 1.0, 1.5) powders, have been synthesized by molten salt method, where x varies from 0 to 1.5 in steps of 0.5. X-ray diffraction (XRD), field emission scanning electron microscope (FESEM) and vibrating sample magnetometer(VSM) were used to analyze the structures and magnetic properties. The results showed that, the magnetoplumbite structures for all samples calcining at 1100°C have been formed. The magnetic hysteresis loop measurements of the hexagonal ferrites powders showed that the saturation magnetization (Ms), the remanent magnetization (Mr), and the coercitivity (Hc) of ferrites depend strongly on the chemical compositions of materials. The data showed that the max Hc was obtained when substitution of x=1.0 (Hc=63.9 Oe), while the best Ms was obtained when substitution of x=0.5 (Ms=54.02 emu/g). Zn and Zr substitutions greatly modified the magnetic properties of BaM hexaferrite.

Sm2Fe17Nx Produced by Calciothermic Reduction Using Different Iron Powders

2006 ◽  
Vol 530-531 ◽  
pp. 187-190
Author(s):  
J.C. Boareto ◽  
Juliano Soyama ◽  
M.D.V. Felisberto ◽  
André L. Slaviero ◽  
Paulo A.P. Wendhausen
Keyword(s):  
Iron Powder ◽  
Carbonyl Iron ◽  
Sponge Iron ◽  
Vibrating Sample Magnetometer ◽  
X Ray Diffraction ◽  
Iron Powders ◽  
X Ray ◽  
Calciothermic Reduction ◽  
The Difference ◽  
Electronic Microscope

This paper compared the influence of the iron powder in the production of Sm2Fe17Nx by calciothermic reduction. Two available iron powders were used: Basf CL carbonyl iron and Ancor MH-100 sponge iron. Both alloys were prepared and analyzed with X-ray diffraction, scanning electronic microscope and vibrating sample magnetometer. The results showed that the alloy produced with Ancor Mh-100 presents a higher anisotropy. The alloy produced with Basf CL has a smaller anisotropy but a higher coercivity. This can be explained by the difference in the microstructure of the two powders.

Dilatometer Analysis of the One Step Quenching and Partitioning Process in a 1.5%Si Steel

2014 ◽  
Vol 783-786 ◽  
pp. 880-885
Author(s):  
David Martin ◽  
Johan Eliasson ◽  
Bengt Brolund ◽  
Ylva Granbom
Keyword(s):  
Phase Transformation ◽  
X Ray Diffraction ◽  
Quenching And Partitioning ◽  
X Ray ◽  
Final Microstructure ◽  
Different Temperatures ◽  
One Step ◽  
The One ◽  
Step Quenching ◽  
Quenching And Partitioning Process

A one step quenching and partitioning process was applied to a 0.2%C-2.0%Mn-0.5%Cr-1.5%Si steel by quenching austenitised samples to several different temperatures below the experimentallydetermined martensite start temperature of 397 °C and isothermally partitioning them beforequenching to room temperature using a quenching deformation dilatometer. These treatmentsyielded predominantly martensitic microstructures containing 5.6 vol.% to 7.5 vol.% retained austenite,as measured by x-ray diffraction. In each treatment, strong dilation was recorded during isothermalpartitioning, with little indication of phase transformation during subsequent cooling to room temperature.This behaviour lends weight to the idea that an isothermal phase transformation occurred duringpartitioning, and that the final microstructure is a mixture of athermally and isothermally formed constituents.These results also suggest that the final microstructure of this steel is mostly formed beforeand during partitioning.

Structural and Magnetic Properties of CoFe2O4 / Si (001) Thin Films via Sol-Gel Method

2013 ◽  
Vol 744 ◽  
pp. 315-318
Author(s):  
Wei Rao ◽  
Ding Guo Li ◽  
Hong Chun Yan
Keyword(s):  
Thin Films ◽  
Magnetic Properties ◽  
Exchange Coupling ◽  
Cobalt Ferrite ◽  
Sol Gel ◽  
Magnetic Hysteresis ◽  
Vibrating Sample Magnetometer ◽  
X Ray Diffraction ◽  
X Ray ◽  
Calcined Temperature

Cobalt ferrite (CoFe2O4) thin films have been prepared on Si (001) substrates, with different calcined temperatures (Tcal=400°C~800°C). The films structure was studied by X-ray diffraction (XRD) and their surface was examined by scanning electron microscopy (SEM). The magnetic properties were measured with a vibrating sample magnetometer (VSM). For low calcined temperatures, the films presented a mixture of a CoFe2O4phase, with the cubic spinel structure, and cobalt and iron antiferromagnet oxides with CoO and FeO stoichiometries. As the calcined temperature increased, the CoO and FeO relative content strongly decreased, so that for Tcal=800°Cthe films were composed mainly by polycrystalline CoFe2O4. The magnetic hysteresis cycles measured in the films were horizontally shifted due to an exchange coupling field originated by the presence of the antiferromagnetic phases.

Preparation of Ag-Modified CaBiO2Cl and its Photocatalytic Ability under Visible Light

2014 ◽  
Vol 955-959 ◽  
pp. 120-126
Author(s):  
Ying Feng ◽  
Wei Huang ◽  
Chao Hao Hu ◽  
Wen Zhao ◽  
Pan Fei Jiao ◽  
...  
Keyword(s):  
Visible Light ◽  
Solid State Reaction Method ◽  
X Ray Diffraction ◽  
Photocatalytic Ability ◽  
Reaction Method ◽  
X Ray ◽  
Photocatalytic Activities ◽  
One Step ◽  
The One ◽  
Scanning Electron

Ag-modified CaBiO2Cl photocatalysts were synthesized by the one-step solid state reaction method. The microstructure and morphology of catalysts were characterized by using X-ray diffraction, Scanning electron microscopy, and Energy dispersive X-ray detector (EDS) techniques. The photocatalytic activities of pure CaBiO2Cl and Ag-CaBiO2Cl catalysts were further evaluated by degrading methylene blue (MB) under visible-light irradiation. The measured UV-vis absorption spectra indicated that the degradation of Ag-modified CaBiO2Cl has been improved by about 12% in comparison with pure CaBiO2Cl. The enhanced photocatalytic activity in Ag-modified CaBiO2Cl can be ascribed to the better morphologies of the composites due to the Ag additive.

First Observation of Non-Resonant X-Ray Magnetic Diffraction for Multilayers

2016 ◽  
Vol 698 ◽  
pp. 3-7
Author(s):  
Hidefumi Shimoyama ◽  
Tokiko Osawa ◽  
Hiromi Watanabe ◽  
Kosuke Suzuki ◽  
Hiroshi Sakurai ◽  
...  
Keyword(s):  
Magnetic Anisotropy ◽  
Magnetic Hysteresis ◽  
Perpendicular Magnetic Anisotropy ◽  
Diffraction Method ◽  
Magnetic Multilayers ◽  
Vibrating Sample Magnetometer ◽  
X Ray Diffraction ◽  
Magnetization Direction ◽  
X Ray ◽  
First Time

Co/Pd magnetic multilayers have been prepared by using a sputtering method. Lattice distances and magnetic hysteresis curves have been measured by X-ray diffraction (XRD) measurements and magnetization measurements using a vibrating sample magnetometer (VSM). The XRD measurements have shown that the samples with thinner Pd layers have shorter lattice distances, and the VSM measurements have shown that the samples of thinner Co and thicker Pd layers are closer to those of perpendicular magnetic anisotropy. We have applied the X-ray magnetic diffraction method to the Co/Pd multilayer for the first time and have succeeded in observing a change in the X-ray diffraction intensities by the reversal of the magnetization direction.

Effects of Y2O3 insertion layer on anisotropic magnetoresistance of Ni81Fe19 films

2016 ◽  
Vol 30 (07) ◽  
pp. 1650072
Author(s):  
Shuyun Wang ◽  
Huaxue Huang ◽  
Yang Sun ◽  
Tiejun Gao ◽  
Yuan He
Keyword(s):  
Phase Composition ◽  
Magnetron Sputtering ◽  
Substrate Temperature ◽  
Magnetic Hysteresis ◽  
Anisotropic Magnetoresistance ◽  
Vibrating Sample Magnetometer ◽  
X Ray Diffraction ◽  
X Ray ◽  
Glass Substrates ◽  
20 Nm

A series of Ta(4 nm)/Y2O[Formula: see text]/Ni[Formula: see text]Fe[Formula: see text](20 nm)/Y2O[Formula: see text]/Ta(3 nm) films were prepared on glass substrates by magnetron sputtering under appropriate conditions. AMR value, phase composition and magnetic hysteresis hoop of Ni[Formula: see text]Fe[Formula: see text] films were measured and analyzed by four-point probe technology, X-ray diffraction (XRD) and vibrating sample magnetometer (VSM), respectively. Influence of Y2O3 which work as oxidation intercalation on AMR values of Ni[Formula: see text]Fe[Formula: see text] films was investigated. The experiment results show that, at the substrate temperature of 450[Formula: see text]C, the AMR value of the film with Y2O3 layer thickness of 2.5 nm can reach 4.61%, increasing by 71.3% compares with the film without Y2O3 layer.

Sign in / Sign up

Export Citation Format

Share Document