Structurization and Properties of Magnetoplastics Made of Mechanically Activated Amorphous-Crystalline Powder Alloys Based on the Nd-Fe-B System

2018 ◽  
Vol 284 ◽  
pp. 455-459
Author(s):  
V.G. Perederiy ◽  
B.G. Gasanov ◽  
A.A. Aganov
Keyword(s):  
Crystal Structure ◽  
Particle Size ◽  
Magnetic Properties ◽  
Melt Spinning ◽  
Crystalline Powder ◽  
Sintered Magnets ◽  
Powder Alloys ◽  
Kinetics Of Formation ◽  
Kinetics Of

The influence of the method of melt spinning on the basis of the Fe-Nd-B system on the amorphous-crystal structure of ribbons and flakes is shown. It is established that the magnetic properties of magnetoplasts depend on the powders particle size, the parameters of mechanic activation during flake milling, the kinetics of formation and growth of Fe2Nd14B phase nuclei at all stages of their preparation and processing, etc. Isotropic and anisotropic magnetoplasts and sintered magnets with magnetic properties: Br = 0.5-1.25 T, HcB = 180-700 kA/m; (BH)max = 50-280 kJ/m3.

Fabrication of Nanostructured Fe-Co Alloy Powders by Hydrogen Reduction and Its Magnetic Properties

2007 ◽  
Vol 534-536 ◽  
pp. 1389-1392
Author(s):  
Young Jung Lee ◽  
Baek Hee Lee ◽  
Gil Su Kim ◽  
Kyu Hwan Lee ◽  
Young Do Kim
Keyword(s):  
Crystal Structure ◽  
Particle Size ◽  
Grain Size ◽  
Magnetic Properties ◽  
Nanostructured Materials ◽  
Hydrogen Reduction ◽  
Internal Strain ◽  
Oxide Powder ◽  
Powder Mixtures ◽  
Effect Of Microstructure

Magnetic properties of nanostructured materials are affected by the microstructures such as grain size (or particle size), internal strain and crystal structure. Thus, it is necessary to study the synthesis of nanostructured materials to make significant improvements in their magnetic properties. In this study, nanostructured Fe-20at.%Co and Fe-50at.%Co alloy powders were prepared by hydrogen reduction from the two oxide powder mixtures, Fe2O3 and Co3O4. Furthermore, the effect of microstructure on the magnetic properties of hydrogen reduced Fe-Co alloy powders was examined using XRD, SEM, TEM, and VSM.

Synthesis, structure, magnetic properties and kinetics of formation of a cluster containing a {Cu3(μ3-OH)} core supported by a triazole-based ligand

2016 ◽  
Vol 69 (3) ◽  
pp. 458-474 ◽  
Author(s):  
Ahmed Jasim M. Al-Karawi ◽  
Eric Maatta ◽  
John Desper ◽  
Leila Maurmann ◽  
Richard A. Henderson ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Kinetics Of Formation ◽  
Kinetics Of

Studies on the formation of Graphite-Ferric Chloride complexes: Kinetics of Formation

1953 ◽  
Vol 6 (3) ◽  
pp. 302 ◽  
Author(s):  
JA Barker ◽  
RC Croft
Keyword(s):  
Particle Size ◽  
Diffusion Coefficients ◽  
Small Difference ◽  
Critical Concentration ◽  
Activation Energies ◽  
Ferric Ions ◽  
Chloride Complexes ◽  
Hexagonal Packing ◽  
Kinetics Of Formation ◽  
Kinetics Of

A study has been made of the kinetics of the diffusion of anhydrous FeC1, in graphite. I t was found that this process can be represented for stages between 50 and 100 per cent. saturation of the graphite and at temperatures in the range 200 to 360 OC by a relation of the type δc/δt = D(δ2c/δr2 + δc/δ/r), providing the diffusion coefficient D is assigned several values for concentrations of occluded FeCl3 above and below a critical concentration. The value of the latter was found to be about two-thirds the saturation concentration of FeCl3 in graphite, this value apparently being the point at which open hexagonal packing of intercalated ferric ions is complete and a closer hexagonal packing commences. Values of the activation energies of occlusion for concentrations above and below two-thirds saturation were found from the relations of corresponding values of diffusion coefficients to temper- ature. The small difference between these activation energies which were of the order of 2 to 3 kcal is attributed to a cancelling of effects, thus the energy necessary to separate carbon lamellae in early stages of occlusion is offset in later stages by hindrance imposed on diffusing molecules by those already occluded. Reduction of particle size of graphite accelerated the occlusion of FeCl3.

scholarly journals Microstructure and Magnetic Properties of Mn55Bi45 Powders Obtained by Different Ball Milling Processes

Metals ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 441 ◽  
Author(s):  
Xiang Li ◽  
Dong Pan ◽  
Zhen Xiang ◽  
Wei Lu ◽  
Dan Batalu
Keyword(s):  
Particle Size ◽  
Magnetic Properties ◽  
Ball Milling ◽  
Melt Spinning ◽  
Positive Temperature Coefficient ◽  
Low Energy ◽  
High Coercivity ◽  
Temperature Phase ◽  
Positive Temperature ◽  
Energy Ball

Low-temperature phase (LTP) MnBi is considered as a promising rare-earth-free permanent magnetic material with high coercivity and unique positive temperature coefficient of coercivity. Mn55Bi45 ribbons with high purity of LTP MnBi phase were prepared by melt spinning. Then, Mn55Bi45 powders with different particle size were obtained by low-energy ball milling (LEBM) with and without added surfactant. The coercivity is enhanced in both cases. Microstructure characterization reveals that Mn55Bi45 powders obtained by surfactant assisted low-energy ball milling (SALEBM) have better particle size uniformity and show higher decomposition of LTP MnBi. Coercivity can achieve a value of 17.2 kOe and the saturation magnetization (Ms) is 16 emu/g when Mn55Bi45 powders milled about 10 h by SALEBM. Coercivity has achieved a maximum value of 18.2 kOe at room temperature, and 23.5 kOe at 380 K after 14 h of LEBM. Furthermore, Mn55Bi45 powders obtained by LEBM have better magnetic properties.

scholarly journals Kinetics of Formation and Crystal Structure Determination of Sr4Al6O12SO4

2017 ◽  
Vol 19 (suppl 1) ◽  
pp. 125-132 ◽  
Author(s):  
José Amparo Rodríguez ◽  
Estrella Guadalupe Ríos Rodríguez ◽  
Enrique Rocha Rangel ◽  
José Manuel Almanza Robles ◽  
Jesús Torres ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Structure Determination ◽  
Crystal Structure Determination ◽  
Kinetics Of Formation ◽  
Kinetics Of
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