scholarly journals Evolution of the Structural and Magnetic Properties of Bulk Fe61Co10B20W1Y8−XPtx Alloys through the Partial Substitution of Pt for Y

Materials ◽  
2020 ◽  
Vol 13 (21) ◽  
pp. 4962
Author(s):  
Pawel Pietrusiewicz ◽  
Marcin Nabiałek ◽  
Bartłomiej Jeż
Keyword(s):  
Magnetic Properties ◽  
Small Addition ◽  
Partial Substitution ◽  
Vibrating Sample Magnetometer ◽  
Chemical Formula ◽  
X Ray ◽  
Saturation Magnetisation ◽  
Structural And Magnetic Properties ◽  
Structural Research ◽  
Scanning Electron

This paper presents the results of an investigation into rapidly quenched Fe-based alloys with the chemical formula: Fe61Co10B20W1Y8−xPtx (where x = 3, 4, 5). In these alloys, a small quantity of Pt was added, and the Y content was reduced concurrently. Samples of the aforementioned alloys were injection-cast in the form of plates with the dimensions: 0.5 mm × 10 mm × 10 mm. The resulting structure was examined using X-ray diffractometry (XRD), Mössbauer spectroscopy and scanning electron microscopy (SEM). The results of the structural research reveal that, with a small addition of Pt, areas rich in Pt and Y are created—in which Fe-Pt and Pt-Y compounds, with different crystallographic systems, are formed. It has also been shown that an increase in Pt content, at the expense of Y, contributed to the formation of fewer crystalline phases, i.e., it allowed a material with a more homogeneous structure to be obtained. Magnetic properties of the Fe61Co10B20W1Y8−xPtx (where x = 3, 4, 5) alloy samples were tested using a vibrating sample magnetometer (VSM). The magnetic properties of the investigated materials revealed that the saturation magnetisation increased with increasing Pt content, at the expense of Y. This effect is due to the occurrence of different proportions of crystalline magnetic phases within the volume of each alloy.

MAGNETIC PROPERTIES OF Co-FERRITE AND SiO2-DOPED Co-FERRITE THIN FILMS AND POWDERS BY SOL–GEL

2004 ◽  
Vol 03 (04n05) ◽  
pp. 463-470
Author(s):  
Y. C. WANG ◽  
J. DING ◽  
B. H. LIU ◽  
Y. SHI
Keyword(s):  
Thin Films ◽  
Magnetic Properties ◽  
Sol Gel ◽  
Vibrating Sample Magnetometer ◽  
X Ray ◽  
Force Microscopy ◽  
Atomic Force ◽  
Structural And Magnetic Properties ◽  
Ferrite Thin Films ◽  
Scanning Electron

Thin films and powders of Co -ferrite and SiO 2-doped Co -ferrite were fabricated via the sol–gel method. The structural and magnetic properties of the films and powders were investigated with X-Ray Diffractometer (XRD), Vibrating Sample Magnetometer (VSM), Atomic Force Microscopy (AFM) and Scanning Electron Microscopy (SEM). VSM measurements showed an enhancement of coercivity by SiO 2-doping for Co -ferrite powders and thin films (coercivity of 3.5 kOe in SiO 2-doped thin films). XRD and SEM investigations revealed a nanostructure of the thin films. Low surface roughness was observed in our AFM study.

Effects of a Partial Substitution of Fe by Al on Nanostructure and Magnetic Properties of (Nd,Pr)-(Fe,Co)-B Alloys Prepared by Mechanical Alloying

2017 ◽  
Vol 48 ◽  
pp. 171-176
Author(s):  
Rahim Sabbaghizadeh ◽  
Roslinda Shamsudin ◽  
Samikanu Kanagesan ◽  
Ghazaleh Bahmanrokh
Keyword(s):  
Electron Microscopy ◽  
Magnetic Properties ◽  
Mechanical Alloying ◽  
Remanent Magnetization ◽  
Partial Substitution ◽  
Vibrating Sample Magnetometer ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scanning Electron ◽  
Microstructure And Magnetic Properties

In this study, Nanocrystalline Nd8Pr2Fe79-xCo5B6Alx (x= 0, 1, 2, 3) magnets were prepared by mechanical alloying method and respective heat treatment in a constant time and temperature. Afterward, the effects of the Al addition on the microstructure and magnetic properties of Nd-Fe-Co-B alloy were studied. The changes in the nanostructure and magnetic properties were examined by X-Ray diffraction (XRD), combined with Field Emission Scanning electron microscopy (FeSEM) and vibrating sample magnetometer (VSM). Addition of Al was found to be effective for improving the coercivity parameter and the hysteresis squareness in Nd–Fe–Co–B magnets without decreasing much the remanent magnetization.

The Effects of Ternary Elemental Additions on the Structure and Magnetic Properties of Nanocrystalline Feco Powders

2002 ◽  
Vol 753 ◽  
Author(s):  
I. Baker ◽  
R. G. Quiller ◽  
M. Robson ◽  
D. Wu
Keyword(s):  
Magnetic Properties ◽  
Vibrating Sample Magnetometer ◽  
X Ray Diffraction ◽  
X Ray ◽  
Grain Sizes ◽  
Before And After ◽  
Diffraction Peaks ◽  
Computer Controlled ◽  
Steel Balls ◽  
Scanning Electron

ABSTRACTPowders of near-equiatomic Fe and Co were mechanically milled with additions of Zr, C, Ni, Cu and/or B for 60 hr using stainless steel balls in a Svegari attritor operated at 1300 r.p.m. under argon. The milled powders were examined before and after annealing at 600 °C. The morphologies and sizes of the powders were examined using a scanning electron microscope. The grain sizes were characterized from the widths of X-ray diffraction peaks obtained using a computer-controlled x-ray diffractometer and the lattice parameters were determined. The resulting magnetic properties were measured using a vibrating sample magnetometer.

STRUCTURAL AND MAGNETIC PROPERTIES OF THE THIN FILM OF COBALT NITRIDE

2014 ◽  
Vol 21 (06) ◽  
pp. 1450081 ◽  
Author(s):  
ZOHRA NAZIR KAYANI ◽  
SAIRA RIAZ ◽  
SHAHZAD NASEEM
Keyword(s):  
Magnetic Properties ◽  
Sol Gel ◽  
Magnetic Memory ◽  
Vibrating Sample Magnetometer ◽  
Orthorhombic Structure ◽  
X Ray ◽  
Cu Substrates ◽  
Gel Technique ◽  
Structural And Magnetic Properties ◽  
Memory Applications

Cobalt nitride has been prepared and studied for magnetic memory applications. Sol–gel technique is used to prepare thin films of cobalt nitride. The films were deposited onto Cu substrates by spin coating at 3000 rpm for 30 s. The films were then air dried and heated at 300°C for 120 min. As-deposited and heated samples were characterized for their structural and magnetic properties using X-ray diffractometer (XRD) and vibrating sample magnetometer (VSM) techniques. The grain size was in the range of 22.7–30.10 nm. Their surface was studied by scanning electron microscopy (SEM). Orthorhombic structure can be seen in SEM micrographs. This orthorhombic structure is also confirmed by XRD.

ZnO Varistor Defective Gd and Pr Ions

2012 ◽  
Vol 332 ◽  
pp. 51-61
Author(s):  
M. El-Hofy ◽  
A. El-Taabl ◽  
A.M. Abdel Aziz ◽  
M. Elkhatib
Keyword(s):  
Magnetic Properties ◽  
Ternary System ◽  
Binary Systems ◽  
Chemical Formula ◽  
X Ray Diffraction ◽  
X Ray ◽  
Zno Varistor ◽  
Spin Resonance ◽  
The Difference ◽  
Scanning Electron

To the best of our knowledge the difference in the magnetic properties of ions like Gd (7.94 μB) and Pr (3.58 μB) on the electrical properties of ZnO-varistor have not been studied. To clarify this effect, the binary systems, ZnO-Gd2O3, ZnO-Pr6O11and the ternary system ZnO-Gd2O3-Pr6O11were studied. The ceramics were prepared according to the chemical formula; (100-X) mol% ZnO - (X) mol% Y, where X = 0.5, 1, 2, 3.5, 5, 6, 7.5, 9 and 15, Y is Gd2O3, Pr6O11or Gd2O3 +Pr6O11. The samples have been sintered at 1200°C, 1250°C, 1300°C, 1350°C and 1400°C for 1 hr. X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Energy Dispersive X-Ray (EDAX), (JxE), (CxV) and Electron Spin Resonance (ESR) have been studied and discussed. Utilizing J-E characteristics, the non-linearity coefficient (α), leakage current (Lg) and breakdown electric field (Eo) have been determined. In the present study, the effect of the magnetic properties on the non-linearity parameters was not clear and the non-linearity characteristics mainly depend upon the microstructure of the system. The ternary system (94%ZnO-4%Pr6O11- 2%Gd2O3) is superior to the binary systems, and can readily serve as a high-voltage varistor.

EFFECT OF SAMARIUM DOPING ON THE STRUCTURAL AND MAGNETIC PROPERTIES OF THE LITHIUM–NICKEL FERRITE

2008 ◽  
Vol 22 (21) ◽  
pp. 2027-2033 ◽  
Author(s):  
LUNHONG AI ◽  
JING JIANG ◽  
HEJUN GAO
Keyword(s):  
Magnetic Properties ◽  
Nickel Ferrite ◽  
Spinel Phase ◽  
Lattice Parameter ◽  
Particle Sizes ◽  
Vibrating Sample Magnetometer ◽  
Soft Chemistry ◽  
X Ray ◽  
Transmission Electron ◽  
Structural And Magnetic Properties

Sm -doped Li – Ni ferrites were synthesized by a soft chemistry method. The effects of Sm -doping on the structural and magnetic properties of the Li – Ni ferrites were investigated. The structural, morphological and magnetic properties of the ferrite samples were characterized by X-ray diffractometer (XRD), transmission electron microscope (TEM) and vibrating sample magnetometer (VSM). The results revealed that the Sm -doped samples had the single spinel phase at low Sm content. The increase in Sm content increased the lattice parameter and decreased the particle sizes. The magnetic properties of the Sm -doped Li – Ni ferrites were strongly affected by Sm content. The saturation magnetization decreased, while coercivity increased with increasing Sm content.

Effects of Heat-Treatment on the Magnetic Properties of Fe2O3-CaO-SiO2 Glass Ceramics

2010 ◽  
Vol 158 ◽  
pp. 52-55 ◽  
Author(s):  
Ye Han ◽  
Ming Gu ◽  
Wei Wei Zhang ◽  
Shu Yu Yao
Keyword(s):  
Heat Treatment ◽  
Thermal Analysis ◽  
Magnetic Properties ◽  
Differential Thermal Analysis ◽  
Glass Ceramics ◽  
Vibrating Sample Magnetometer ◽  
Crystalline Phases ◽  
Sio2 Glass ◽  
X Ray ◽  
Saturation Magnetisation

The Fe2O3-CaO-SiO2 glass ceramics were prepared by the method of quenching and controlled crystallisation. Differential thermal analysis, X-ray diffractometry and vibrating sample magnetometer were used to study the crystallisation and magnetic properties of Fe2O3-CaO-SiO2 glass ceramics. It was concluded that the main crystalline phases of glass ceramics during the process were Hematite, Iron Silico Oxide and Hedenbergite. The saturation magnetisation values (Ms) of glass ceramics varied between 108 emu•g-1 and 147 emu•g-1. The crystallisation of Hedenbergite lead to the high Hc value (~2000Oe).

MAGNETIC PROPERTIES AND MÖSSBAUER SPECTRA OF Fe7S8 NANORODS

2012 ◽  
Vol 11 (05) ◽  
pp. 1250036 ◽  
Author(s):  
WEIGAO WANG ◽  
FAGEN LI ◽  
FAN ZHAO ◽  
JUN WANG ◽  
GUOMENG ZHAO
Keyword(s):  
Electron Microscopy ◽  
Magnetic Properties ◽  
Mössbauer Spectra ◽  
Iron Sulfide ◽  
Impurity Phase ◽  
Vibrating Sample Magnetometer ◽  
X Ray Diffraction ◽  
X Ray ◽  
Mossbauer Spectra ◽  
Scanning Electron

Fe7S8 nanorods have been successfully synthesized using a chemical evaporation method. X-ray diffraction pattern showed that the as-prepared products were Fe7S8 with no impurity phase. The results of scanning electron microscopy indicated that the samples synthesized at 750°C and 900°C were rod and sheet-like, respectively. The magnetic properties of the iron sulfide nanorods were measured over a wide temperature range (4 K–750 K) using a quantum design vibrating sample magnetometer. It was found that the nanorods were ferromagnetic with the Curie temperature of about 581 K. The Mössbauer spectra showed that the iron sulfide nanorods consisted of hexagonal pyrrhotites, whose spectra were asymmetrical according to correlation between the isomer shift and the hyperfine field.

Effect of Annealing temperature on the Structural and Magnetic Properties of TbxY3-xFe5O12(x = 0.0, 1.0, 2.0) Thin Films Prepared by Sol-Gel Process

2012 ◽  
Vol 501 ◽  
pp. 236-241 ◽  
Author(s):  
Ftema W. Aldbea ◽  
Noor Bahyah Ibrahim ◽  
Mustafa Hj. Abdullah ◽  
Ramadan E. Shaiboub
Keyword(s):  
Thin Films ◽  
Magnetic Properties ◽  
Room Temperature ◽  
Annealing Temperature ◽  
Sol Gel ◽  
Vibrating Sample Magnetometer ◽  
X Ray ◽  
Garnet Phase ◽  
Sol Gel Process ◽  
Amorphous Structures

Thin films nanoparticles TbxY3-xFe5O12 (x=0.0, 1.0, 2.0) were prepared by the sol-gel process followed by annealing process at various annealing temperatures of 700° C, 800° C and 900° C in air for 2 h. The results obtained from X-ray diffractometer (XRD) show that the films annealed below 900°C exhibit peaks of garnet mixed with small amounts of YFeO3 and Fe2O3. Pure garnet phase has been detected in the films annealed at 900°C. Before annealing the films show amorphous structures. The particles sizes measurement using the field emission scanning electron microscope (FE-SEM) showed that the particles sizes increased as the annealing temperature increased. The magnetic properties were measured at room temperature using the vibrating sample magnetometer (VSM). The saturation magnetization (Ms) of the films also increased with the annealing temperature. However, different behavior of coercivity (Hc) has been observed as the annealing temperature was increased.

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