Synthesis and magnetic properties of rare-earth free MnBi alloy: A high-energy hard magnetic material

2018 ◽  
Author(s):  
Sanjeev Kumar Sharma ◽  
H. R. Prakash ◽  
S. Ram ◽  
D. Pradhan
Keyword(s):  
Magnetic Material ◽  
Magnetic Properties ◽  
Rare Earth ◽  
High Energy ◽  
Hard Magnetic Material

An Analytical Electron Microscopy Characterization of Melt-Spun Iron/Rare-Earth/Boron Magnetic Materials

1985 ◽  
Vol 58 ◽  
Author(s):  
R.C. Dickenson ◽  
K.R. Lawless ◽  
G.C. Hadjiipanayis
Keyword(s):  
Electron Microscopy ◽  
Magnetic Properties ◽  
Rare Earth ◽  
Melt Spinning ◽  
Analytical Electron Microscopy ◽  
High Energy ◽  
Ion Milling ◽  
Analytical Electron ◽  
Strategic Element ◽  
Microscopy Characterization

Iron/rare-earth/boron permanent magnet materials have recently been delveloped to reduce the need for the strategic element cobalt, which was previously the primary canponent of high-energy magnets. These materials are generally produced by annealing rapidly solidified ribbons or by conventional powder metallurgy techniques. This paper will report results from an analytical electron microscopy characterization undertaken to establish the relationship between the magnetic properties and the microstructure of two iron/rare-earth/boron (Fe/RE/B) alloys. Ribbons of Fe75Pr15B10 and Fe77Tb15B8 were produced by melt-spinning. To obtain optimum magnetic properties, both alloys were then annealed at 700°C, the FePrB ribbons for 6 minutes and the FeTbB ribbons for 90 minutes. Foils for transmission electron microscopy were prepared by ion-milling the ribbons on a cold stage and examined using a Philips 400T TEM/STEM equipped with an energy dispersive x-ray unit.

scholarly journals Structure and Magnetic Properties of Intermetallic Rare-Earth-Transition-Metal Compounds: A Review

Materials ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 201
Author(s):  
Lotfi Bessais
Keyword(s):  
Magnetic Properties ◽  
Electronic Structure ◽  
Rare Earth ◽  
Transition Metal ◽  
Magnetic Measurements ◽  
High Energy ◽  
Metal Compounds ◽  
Energy Ball ◽  
Magnetic Applications ◽  
Short Annealing

This review discusses the properties of candidate compounds for semi-hard and hard magnetic applications. Their general formula is R1−sT5+2s with R = rare earth, T = transition metal and 0≤s≤0.5 and among them, the focus will be on the ThMn12- and Th2Zn17-type structures. Not only will the influence of the structure on the magnetic properties be shown, but also the influence of various R and T elements on the intrinsic magnetic properties will be discussed (R = Y, Pr, Nd, Sm, Gd, … and T = Fe, Co, Si, Al, Ga, Mo, Zr, Cr, Ti, V, …). The influence of the microstructure on the extrinsic magnetic properties of these R–T based intermetallic nanomaterials, prepared by high energy ball milling followed by short annealing, will be also be shown. In addition, the electronic structure studied by DFT will be presented and compared to the results of experimental magnetic measurements as well as the hyperfine parameter determined by Mössbauer spectrometry.

Development of Equipment for the Measurement of Magnetic Properties of Hard Magnetic Material at Elevated Temperature

2014 ◽  
Vol 701-702 ◽  
pp. 607-611
Author(s):  
Wen Fan ◽  
Rui Fen Hou ◽  
Jian He ◽  
Zhi Gao Zhang ◽  
An Li Lin
Keyword(s):  
Magnetic Material ◽  
Magnetic Properties ◽  
High Temperature ◽  
Elevated Temperature ◽  
Magnetic Circuit ◽  
Measuring Range ◽  
Hard Magnetic Material ◽  
Mesh Screen ◽  
Different Temperatures ◽  
Closed Magnetic Circuit

For application in the magnetic material at high temperature, the equipment for the measurement of magnetic properties of hard magnetic material at elevated temperature has been developed. The temperature coefficient of remanence and coercive, demagnetization curves at different temperatures was measured by this equipment. The heating plate which using the mesh screen printer substrate method was designed to realize the accurate measurement in the quasi closed magnetic circuit .The temperature measuring range is from room temp. 500 °C.

Features of the Post-Deformation Hardening of Fe-Cr-Co Hard Magnetic Alloys with W and Ga Additives

2009 ◽  
Vol 152-153 ◽  
pp. 54-57 ◽  
Author(s):  
E.V. Belozerov ◽  
N.N. Shchegoleva ◽  
G.V. Ivanova ◽  
N.V. Mushnikov
Keyword(s):  
Electron Microscopy ◽  
Magnetic Material ◽  
Magnetic Properties ◽  
Magnetic Alloys ◽  
Hard Magnetic Material ◽  
X Ray ◽  
Electron Microscopy Analysis ◽  
Deformation Hardening ◽  
Microscopy Analysis ◽  
Strength And Plasticity

The structure, mechanical and magnetic properties have been studied for Fe-Cr-Co-based hard magnetic alloys with W and Ga additives, subjected by the quenching and post-deformation hardening. The alloys combine the properties of the hard magnetic material with outstanding mechanical strength and plasticity. Using X-ray and electron microscopy analysis, the reasons and conditions of formation of these properties have been determined.

Structural, Morphological and Magnetic Characterization of Sm-substituted Ni-Zn Ferrite

2020 ◽  
Vol 10 (2) ◽  
pp. 152-156 ◽  
Author(s):  
Muhammad Hanif bin Zahari ◽  
Beh Hoe Guan ◽  
Lee Kean Chuan ◽  
Afiq Azri bin Zainudin
Keyword(s):  
Magnetic Properties ◽  
Rare Earth ◽  
Saturation Magnetization ◽  
Sol Gel ◽  
Magnetic Behavior ◽  
Rare Earth Ions ◽  
Ion Concentration ◽  
Zn Ferrite ◽  
Auto Combustion ◽  
Combustion Technique

Background: Rare earth materials are known for its salient electrical insulation properties with high values of electrical resistivity. It is expected that the substitution of rare earth ions into spinel ferrites could significantly alter its magnetic properties. In this work, the effect of the addition of Samarium ions on the structural, morphological and magnetic properties of Ni0.5Zn0.5SmxFe2-xO4 (x=0.00, 0.02, 0.04, 0.06, 0.08, 0.10) synthesized using sol-gel auto combustion technique was investigated. Methods: A series of Samarium-substituted Ni-Zn ferrite nanoparticles (Ni0.5Zn0.5SmxFe2-xO4 where x=0.00, 0.02, 0.04, 0.06, 0.08, 0.10) were synthesized by sol-gel auto-combustion technique. Structural, morphological and magnetic properties of the samples were examined through X-Ray Diffraction (XRD), Field-Emission Scanning Electron Microscope (FESEM) and Vibrating Sample Magnetometer (VSM) measurements. Results: XRD patterns revealed single-phased samples with spinel cubic structure up to x= 0.04. The average crystallite size of the samples varied in the range of 41.8 – 85.6 nm. The prepared samples exhibited agglomerated particles with larger grain size observed in Sm-substituted Ni-Zn ferrite as compared to the unsubstituted sample. The prepared samples exhibited typical soft magnetic behavior as evidenced by the small coercivity field. The magnetic saturation, Ms values decreased as the Sm3+ concentration increases. Conclusion: The substituted Ni-Zn ferrites form agglomerated particles inching towards more uniform microstructure with each increase in Sm3+ substitution. The saturation magnetization of substituted samples decreases with the increase of samarium ion concentration. The decrease in saturation magnetization can be explained based on weak super exchange interaction between A and B sites. The difference in magnetic properties between the samples despite the slight difference in Sm3+ concentrations suggests that the properties of the NiZnFe2O4 can be ‘tuned’, depending on the present need, through the substitution of Fe3+ with rare earth ions.

(thf)2Ln(Ge9{Si(SiMe3)3}3)2 (Ln = Eu, Sm): the first coordination of metalloid germanium clusters to lanthanides

2021 ◽  
Author(s):  
Andreas Schnepf ◽  
Svetlana Klementyeva ◽  
Claudio Schrenk ◽  
Marat M Khusniyarov ◽  
Minghui Zhang
Keyword(s):  
Magnetic Properties ◽  
Rare Earth ◽  
Crystallographic Analysis ◽  
Rare Earth Complexes ◽  
Group 14 ◽  
X Ray ◽  
Germanium Clusters

We report the synthesis, structure and magnetic properties of the first rare earth complexes of metalloid group 14 clusters [(thf)2Ln(Ge9Hyp3)2] (Ln = Eu, Sm, Hyp = Si(SiMe3)3). X-ray crystallographic analysis...

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