Influence of the Process for Obtaining Massive Amorphous Materials on the Defects of the Structure in the Alloy Fe61+xCo10-xY8W1B20 , where x = 0 or 1

2018 ◽  
Vol 69 (9) ◽  
pp. 2546-255 ◽  
Author(s):  
Marcin Nabialek ◽  
Bartlomiej Jez ◽  
Kinga Jez
Keyword(s):  
Amorphous Materials ◽  
Magnetic Hysteresis ◽  
Hysteresis Loops ◽  
Amorphous Structure ◽  
Stiffness Parameter ◽  
Copper Mold ◽  
X Ray Diffraction ◽  
X Ray ◽  
Magnetic Hysteresis Loops ◽  
Vibration Magnetometer

As part of the work, a rapid cooled alloy was produced with the chemical composition Fe61+xCo10-xY8W1B20, where: x = 0 or 1 using two methods, suction in and injecting the molten alloy into the copper mold. The material was obtained in the form of 10 mm x 5 mm x 0.5 mm plates. Studies on the structure of the obtained alloys were carried out using X-ray diffraction. Obtained X-ray diffraction images are typical for amorphous materials. Using the vibration magnetometer, static magnetic hysteresis loops and primary magnetization curves were measured. The produced samples are characterized by a saturation value above 1T and a coercive field value below 200 A/m. Based on the theory of H. Kronm�ller, numerical analysis of the curves of the original magnetization was carried out. It has been found that the process of magnetizing the produced materials has defects of the amorphous structure in the form of pseudo-location dipoles and free volumes. In addition, the spin wave stiffness parameter was determined.

Structural and Magnetic Properties of the Rapid Cooled Alloys: Fe60Co10Y5+xZr5-xB20 (Where: x = 0 or 2)

2019 ◽  
Vol 70 (1) ◽  
pp. 224-227
Author(s):  
Marcin Nabialek ◽  
Bartlomiej Jez ◽  
Kinga Jez ◽  
Katarzyna Bloch
Keyword(s):  
Room Temperature ◽  
Nanocrystalline Material ◽  
Magnetic Hysteresis ◽  
Hysteresis Loops ◽  
Single Step ◽  
Magnetic Polarization ◽  
X Ray ◽  
High Temperature Alloys ◽  
Magnetic Hysteresis Loops ◽  
Vibration Magnetometer

This article presents the results of tests on high-temperature alloys, produced on the basis of the FeCoB matrix. The nanocrystalline material was produced in a single-step process of rapid cooling of liquid alloy that was injected into a copper mould. Alloy samples were obtained in the form of 10mm x 5mm x 0.5mm tiles. Studies of the structure of the manufactured alloys were undertaken using Bruker X-ray analysis equipment (featuring a CuKa lamp). The magnetic polarization of saturation was measured, as a function of temperature, using a Faraday magnetic balance; the measurements ranged from room temperature up to 850K. Through numerical analysis of the curves, the Curie temperature of the investigated alloys was determined. Using a vibration magnetometer, static magnetic hysteresis loops were measured. The magnetization of saturation of the tested alloys was greater than 1 T, while the coercive field values were 400 and 16600 A/m. The stiffness parameter of the spin wave Dspf was determined.

MgB2 Thick Film Grown on Silicon Carbide Substrate by Hybrid Physical-Chemical Vapor Deposition

2007 ◽  
Vol 546-549 ◽  
pp. 2067-2070
Author(s):  
Fen Li ◽  
Tao Guo ◽  
Kai Cheng Zhang ◽  
Li Ping Chen ◽  
Chin Ping Chen ◽  
...  
Keyword(s):  
Magnetic Hysteresis ◽  
Chemical Deposition ◽  
Hysteresis Loops ◽  
Chemical Vapor ◽  
X Ray Diffraction ◽  
X Ray ◽  
Bean Model ◽  
Physical Chemical ◽  
Silicon Carbide Substrate ◽  
Magnetic Hysteresis Loops

We have successfully synthesized MgB2 thick films on 4H-SiC substrate by hybrid physical-chemical deposition (HPCVD). They have TC above 40 K, X-ray diffraction (XRD) shows the polycrystal bulk like structure. And JC estimated using magnetic hysteresis loops (MHLs) and Bean model is 7.4 MA/cm2 in self field, at 5 K.

OXIDATION PROCESS OF Fe NANOPARTICLES

2007 ◽  
Vol 21 (18) ◽  
pp. 1143-1151 ◽  
Author(s):  
K. SIMEONIDIS ◽  
S. MOURDIKOUDIS ◽  
I. TSIAOUSSIS ◽  
N. FRANGIS ◽  
M. ANGELAKERIS ◽  
...  
Keyword(s):  
Oxidation Process ◽  
Magnetic Hysteresis ◽  
Hysteresis Loops ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ft Ir ◽  
Magnetic Hysteresis Loops ◽  
Conventional Microscopy ◽  
Ft Ir Spectroscopy

The natural oxidation process is studied in the case of 15 nm iron nanoparticles produced by the thermal decomposition of Fe(CO) 5. X-ray diffraction spectra of the nanoparticles at different timescales after exposure to air revealed the instant oxidation of iron and the formation of wüstite and magnetite. Wüstite mainly occupies the interior of nanoparticles, as evidenced by microscopy, but is slowly transformed to a spinel structure. The shape, the dispersion and the role of surfactant were investigated by conventional microscopy and Fourier Transformed-Infrared (FT-IR) spectroscopy. Magnetic hysteresis loops confirmed the expected variation of magnetic properties till the steady state.

Effects of Single-Substitution and Co-Substitution on BiFeO3 Nanoparticles

2014 ◽  
Vol 602-603 ◽  
pp. 23-26
Author(s):  
Xing Ao Li ◽  
Wei Wei Mao ◽  
Xing Fu Wang ◽  
Xi Wang Wang ◽  
Yong Tao Li ◽  
...  
Keyword(s):  
Ferroelectric Properties ◽  
Magnetic Hysteresis ◽  
Hysteresis Loops ◽  
Rhombohedral Structure ◽  
X Ray Diffraction ◽  
Structure Transition ◽  
X Ray ◽  
Multiferroic Bifeo ◽  
Structure Surface ◽  
Magnetic Hysteresis Loops

Multiferroic BiFeO3 nanoparticles have been prepared by solgel method. The effects of single-substituted and co-substituted on the structures and magnetism of all the samples are investigated systematically. X-ray diffraction and Raman spectra results confirm that the samples simulate from a distorted rhombohedral structure to a cubic structure. Surface morphology of the samples were examined by scanning electron microscope (SEM). The ferroelectric and magnetic hysteresis loops shows coexistence of magnetism and ferroelectricity in the room temperature. The structure transition may be the main cause for the origin of improved magnetic and ferroelectric properties.

New method for the production of bulk amorphous materials of Nd–Fe–B alloys

2005 ◽  
Vol 20 (3) ◽  
pp. 563-566 ◽  
Author(s):  
Tetsuji Saito ◽  
Hiroyuku Takeishi ◽  
Noboru Nakayama
Keyword(s):  
Electron Microscopy ◽  
Amorphous Materials ◽  
Room Temperature ◽  
Amorphous Structure ◽  
X Ray Diffraction ◽  
Bulk Materials ◽  
X Ray ◽  
Transmission Electron ◽  
Melt Spun ◽  
Melt Spun Ribbons

We report a new compression shearing method for the production of bulk amorphous materials. In this study, amorphous Nd–Fe–B melt-spun ribbons were successfully consolidated into bulk form at room temperature by the compression shearing method. X-ray diffraction and transmission electron microscopy studies revealed that the amorphous structure was well maintained in the bulk materials. The resultant bulk materials exhibited the same magnetic properties as the original amorphous Nd–Fe–B materials.

Extended X-ray absorption fine-structure analysis of vacuum-deposited amorphous germanium

1989 ◽  
Vol 67 (4) ◽  
pp. 358-364 ◽  
Author(s):  
G. W. Johnson ◽  
D. E. Brodie ◽  
E. D. Crozier
Keyword(s):  
Fine Structure ◽  
Amorphous Materials ◽  
Amorphous Material ◽  
Amorphous Structure ◽  
Low Energy ◽  
X Ray Diffraction ◽  
Two Phase ◽  
Edge Structure ◽  
X Ray ◽  
Low Energy Electrons

In this study, thin films of germanium have been vacuum deposited in four regimes. Care was taken to prepare reproducible films, which required that the partial pressure of water be below 10−8 Torr during deposition (1 Torr = 133.3 Pa). First, films deposited onto substrates held during deposition at a temperature Ts that is below 473 K are amorphous. Once annealed above 423 K, their electrical conductivity and optical band gap are independent of deposition temperature and rate, and of whether or not low-energy electron irradiation of the substrate is used during deposition. This suggests that a well-defined and reproducible structure is being prepared. Second, a "precrystallization regime" is obtained when Ts is between 473 and 513 K. Extended X-ray adsorption fine-structure and X-ray diffraction confirm that this regime is a two-phase mixture of amorphous material and crystallites. Third, films deposited with Ts near 513 K, while using low-energy electrons to bombard the substrate, are amorphous, but these films have different electrical and optical properties from the films m the first regime. From this, we infer that a second well-defined amorphous structure exists. Fourth, films deposited with Ts above 513 K are polycrystalline. Extended X-ray adsorption fine-structure and X-ray adsorption near-edge structure could not distinguish between the two amorphous materials in the first and third regimes.

Preparation and Properties of Zn1-XCoxO Magnetic Microspheres

2010 ◽  
Vol 663-665 ◽  
pp. 1081-1084
Author(s):  
Zhi Fu Liu ◽  
Qing Hong Zhang ◽  
Li Yun Chen ◽  
Yao Gang Li ◽  
Hong Zhi Wang
Keyword(s):  
Electron Microscopy ◽  
Room Temperature ◽  
Magnetic Hysteresis ◽  
Hysteresis Loops ◽  
Magnetic Microspheres ◽  
Diffraction Field ◽  
Vibrating Sample Magnetometry ◽  
X Ray ◽  
Transmission Electron ◽  
Magnetic Hysteresis Loops

Zn1-xCoxO magnetic microspheres have been synthesized by a simple solvothermal process. Different Co2+ dopant concentrations have been used as modifier and proved to be efficient at controlling the morphology and magnetic property of Zn1-xCoxO microspheres. The as-synthesized samples are characterized by X-ray powder diffraction, field-emission scanning electron microscopy, transmission electron microscopy, photoluminescence spectrophotometer and vibrating sample magnetometry. Magnetic hysteresis loops reveal the samples exhibit ferromagnetic loops at room temperature. The meta-saturation magnetization value and coercivity of Zn0.8Co0.2O reach 0.09 emu·g-1 and 15.0 Oe.

Structure and Magnetic Properties of Ga Substituted Ni-Ferrites

2013 ◽  
Vol 446-447 ◽  
pp. 68-72
Author(s):  
Ahmad Amirabadizadeh ◽  
Zobedeh Momeni Larimi ◽  
Saeideh Eghbali
Keyword(s):  
Magnetic Properties ◽  
Single Phase ◽  
Sol Gel ◽  
Magnetic Hysteresis ◽  
Hysteresis Loops ◽  
X Ray Diffraction ◽  
Auto Ignition ◽  
Transmission Electron ◽  
Magnetic Hysteresis Loops ◽  
Ga Content

Nanocrystalline Ga doped nickel ferrite [(NiFe2-xGaxO4 (x=0.0, 0.1, 0.3, 0.5 and 0.7)] powders have been synthesized by sol-gel auto-ignition method and the effect of non-magnetic gadillum content on the nanosize particles and magnetic properties has been studied. The X-ray diffraction (XRD) revealed that the powders obtained are single phase with spinel structure. The calculated grain size from XRD data have been verified using transmission electron microscopy (TEM). TEM photograph shows that the powders consist of nanometer sized grain. The size of nanoparticles decreases as the non magnetic Ga content increases. Magnetic hysteresis loops were measured at room temperature with maximum applied magnetic field of 20 KOe. As Ga content increases, the measured magnetic hysteresis curves became border and saturation magnetization (MS) increased up to x= 0.3 and further increase of x leads the magnetization to decrease. The results are explained according to the assumed cation distribution.

STRUCTURAL, MAGNETIC AND DIELECTRIC PROPERTIES OF Fe-DOPED BaTiO3 SOLIDS

2012 ◽  
Vol 26 (09) ◽  
pp. 1250056 ◽  
Author(s):  
ZHENGANG GUO ◽  
LIHONG YANG ◽  
HONGMEI QIU ◽  
XUEDAN ZHAN ◽  
JINHUA YIN ◽  
...  
Keyword(s):  
Dielectric Properties ◽  
Photoelectron Spectroscopy ◽  
Magnetic Hysteresis ◽  
Hysteresis Loops ◽  
Double Exchange ◽  
Exchange Interactions ◽  
Magnetic Element ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ferromagnetic Order

The structural, ferroelectric and magnetic properties of bulk perovskite Fe -doped BaTiO 3 (BFTO) prepared by standard solid-state reaction have been investigated. X-ray diffraction (XRD) identifies the tetragonal structure of BFTO samples. Rietveld refinements of XRD data indicates that the doping ions led to ab-plane expansion and out-of-ab-plane shrinkage of the BFTO phases. X-ray photoelectron spectroscopy (XPS) measurements for the prepared samples reveals that Fe 3+ and Fe 4+ ions replaces Ti 4+ ions in the crystal lattice to form single-phase BFTO solids. The results of the temperature-dependent dielectric properties and magnetic hysteresis loops for the BFTO solids show simultaneously the ferroelectric order and ferromagnetic order at room temperature. The doping of magnetic element Fe brings about ferromagnetic order for the samples, and the measured magnetic moment for each Fe atom increases from 0.70 μB to 1.55 μB in BFTO samples. The origin of ferromagnetism of the BFTO samples should be attributed to the double exchange interactions of Fe 3+– O 2– Fe 4+ ions.

Logarithmic Relaxation of Resistance in Time of Annealed and Plastically Deformed Au80Fe20

2000 ◽  
Vol 634 ◽  
Author(s):  
P. Allia ◽  
M. Baricco ◽  
E. Bosco ◽  
M. Coisson ◽  
D. Falletti ◽  
...  
Keyword(s):  
Electrical Resistance ◽  
Melt Spinning ◽  
Magnetic Measurements ◽  
Magnetic Hysteresis ◽  
Hysteresis Loops ◽  
Thermal Treatments ◽  
X Ray Diffraction ◽  
X Ray ◽  
Different Temperatures ◽  
Rapidly Solidified

ABSTRACTRapidly solidified Au80Fe20 ribbons were prepared either by melt spinning or by solidstate quenching of a homogenised master alloy. The as-quenched sample displays a paramagnetic behavior indicating a perfect solid solution of Fe in the Au matrix. Subsequent anneals have been performed to induce the precipitation of Fe particles. X-ray diffraction technique have been exploited to determine the alloy microstructure. The structural stability have been studied by measuring electrical properties in isothermal and tempering condition. The variation of magnetisation and electrical resistance have been measured after submitting the samples to plastic deformation. A logarithmic relaxation of the electrical resistance is observed in all studied samples after deformation. Magnetic hysteresis loops have been measured in as-quenched and annealed samples at different temperatures. X-ray diffraction and magnetic measurements indicate that thermal treatments have been successful in inducing the precipitation of both bcc and fcc Fe clusters.

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