scholarly journals Study of the effect of nitrogen and hydrogen on the structure and magnetic properties of (Sm, Er)2Fe17 alloys

2021 ◽  
Vol 2103 (1) ◽  
pp. 012073
Author(s):  
I S Tereshina ◽  
S V Veselova ◽  
O V Akimova ◽  
M A Paukov ◽  
A Yu Karpenkov ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Permanent Magnets ◽  
Magnetic Hysteresis ◽  
Partial Substitution ◽  
Pulsed Magnetic Fields ◽  
Mechanical Grinding ◽  
Static Magnetic Fields ◽  
X Ray ◽  
Powder Samples ◽  
Grinding Time

Abstract Materials based on the Sm2Fe17 compound with nitrogen have great potential for the manufacture of highly efficient permanent magnets. The initial, nitrided, and hydrogenated alloys based on the Sm2Fe17 intermetallic compound with partial substitution of erbium atoms for samarium atoms Sm1.2Er0.8Fe17(H, N)x have been studied by X-ray phase analysis and scanning electron microscopy. Nanopowders of Sm1.2Er0.8Fe17N2 were obtained by mechanical grinding. The grinding time was varied from 0 to 60 minutes. The magnetic hysteresis properties of all powder samples were studied in static magnetic fields up to 7 T, as well as in pulsed magnetic fields up to 60 T. The strength of the intersublattice exchange interaction was estimated. The obtained values λ are valid only for the explored concentration of Sm/Er ions.

scholarly journals Влияние режимов измельчения порошковых материалов (Sm,Ho)-=SUB=-2-=/SUB=-Fe-=SUB=-17-=/SUB=-N-=SUB=-x-=/SUB=- (x=0; 2.4) на их структуру и магнитные свойства

2020 ◽  
Vol 90 (7) ◽  
pp. 1159
Author(s):  
С.В. Веселова ◽  
И.С. Терёшина ◽  
В.Н. Вербецкий ◽  
А.Ю. Карпенков ◽  
А.Г. Савченко
Keyword(s):  
Permanent Magnets ◽  
Magnetic Hysteresis ◽  
High Energy ◽  
Partial Substitution ◽  
Magnetic Characteristics ◽  
X Ray Diffraction ◽  
X Ray ◽  
Structure Topology ◽  
Powder Samples ◽  
Composition Structure

The composition, structure, topology of the surface of a cast, homogenized, and nitrogenated alloy based on the Sm2Fe17 intermetallic compound by Ho substitution for Sm have been investigated by means of X-ray fluorescence, X-ray diffraction, and scanning electron microscopy using BSE/EDS detectors. Magnetic properties are presented for initial Sm1.2Но0.8Fe17 compound, Sm1.2Но0.8Fe17N2.4 nitride and its milled powders. It has been established that the partial substitution of Sm by Ho in the rare-earth sublattice in combination with the effect of introduction of nitrogen into the lattice of initial compound lead to an increase of such magnetic characteristics as specific magnetization and coercive force. Comparative analysis of the magnetic hysteresis properties of powder samples showed that an increase of the milling time Sm-Ho-Fe-N powders using high-energy ball milling (15, 30, 45 and 60 min) improves the main magnetic characteristics. The functional characteristics of Sm-Ho-Fe-N powders prepared by milling are an important for the development of new high-coercive permanent magnets based on them.

scholarly journals Single shot x-ray diffractometry in SACLA with pulsed magnetic fields up to 16 T

2020 ◽  
Vol 2 (4) ◽  
Author(s):  
Akihiko Ikeda ◽  
Yasuhiro H. Matsuda ◽  
Xuguang Zhou ◽  
Takeshi Yajima ◽  
Yuya Kubota ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Single Shot ◽  
Pulsed Magnetic Fields ◽  
X Ray

scholarly journals Mn-Induced Thermal Stability of L10 Phase in Fept Magnetic Nanoscale Ribbons

Nanomaterials ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 1278
Author(s):  
Alina Daniela Crisan ◽  
Aurel Leca ◽  
Dan Pantelica ◽  
Ioan Dan ◽  
Ovidiu Crisan
Keyword(s):  
Rare Earth ◽  
Single Phase ◽  
Permanent Magnets ◽  
Magnetic Hysteresis ◽  
Ternary Alloys ◽  
Large Temperature ◽  
Nominal Composition ◽  
X Ray Diffraction ◽  
X Ray ◽  
Operation Conditions

Magnetic nanoscale materials exhibiting the L10 tetragonal phase such as FePt or ternary alloys derived from FePt show most promising magnetic properties as a novel class of rare earth free permanent magnets with high operating temperature. A granular alloy derived from binary FePt with low Pt content and the addition of Mn with the nominal composition Fe57Mn8Pt35 has been synthesized in the shape of melt-spun ribbons and subsequently annealed at 600 °C and 700 °C for promoting the formation of single phase, L10 tetragonal, hard magnetic phase. Proton-induced X-ray emission spectroscopy PIXE has been utilized for checking the compositional effect of Mn addition. Structural properties were analyzed using X-ray diffraction and diffractograms were analyzed using full profile Rietveld-type analysis with MAUD (Materials Analysis Using Diffraction) software. By using temperature-dependent synchrotron X-ray diffraction, the disorder–order phase transformation and the stability of the hard magnetic L10 phase were monitored over a large temperature range (50–800 °C). A large interval of structural stability of the L10 phase was observed and this stability was interpreted in terms of higher ordering of the L10 phase promoted by the Mn addition. It was moreover found that both crystal growth and unit cell expansion are inhibited, up to the highest temperature investigated (800 °C), proving thus that the Mn addition stabilizes the formed L10 structure further. Magnetic hysteresis loops confirmed structural data, revealing a strong coercive field for a sample wherein single phase, hard, magnetic tetragonal L10 exists. These findings open good perspectives for use as nanocomposite, rare earth free magnets, working in extreme operation conditions.

Comparative High-Field Magnetization Study of (Sm,Er)2Fe17 and Er2Fe17 Compounds and their Nitrides

2021 ◽  
Vol 1037 ◽  
pp. 148-153
Author(s):  
Lev Aleksandrovich Ivanov ◽  
Michael Paukov ◽  
Irina Tereshina ◽  
Svetlana Veselova ◽  
Olga V. Akimova ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Single Crystal ◽  
High Field ◽  
Mechanical Grinding ◽  
Field Magnetization ◽  
High Field Magnetization ◽  
Magnetization Data ◽  
Powder Samples ◽  
Magnetization Behavior ◽  
Grinding Time

Magnetic properties of the R2Fe17 compounds are sensitive to the atomic substitutions and interstitial absorption of nitrogen. In our work, both were combined and their effect on the magnetization behavior of Er2Fe17 compound in magnetic fields up to 58 T was studied. Er2Fe17N2, Sm1.2Er0.8Fe17N2 and Sm1.8Er0.2Fe17N2.1 nitrides were prepared. Magnetization measurements were carried out, mainly on powder samples (excluding Er2Fe17 single crystal). Nanopowders of Sm1.2Er0.8Fe17N2 were obtained by mechanical grinding. The grinding time was varied from 0 to 60 minutes. The strength of the inter-sublattice coupling in samples is estimated by analyzing high-field magnetization data.

scholarly journals An Analytical–Experimental Approach to Quantifying the Effects of Static Magnetic Fields for Cell Culture Applications

2020 ◽  
Vol 10 (2) ◽  
pp. 531
Author(s):  
Pablo Ferrada ◽  
Sebastián Rodríguez ◽  
Génesis Serrano ◽  
Carol Miranda-Ostojic ◽  
Alejandro Maureira ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Permanent Magnets ◽  
Bubbly Flow ◽  
Scenedesmus Obliquus ◽  
Relative Difference ◽  
Magnetic Flux Density ◽  
The South ◽  
Nannochloropsis Gaditana ◽  
Static Magnetic Fields ◽  
The North

This work aimed to study the effects of static magnetic fields (SMFs) on cell cultures. A glass flask was filled with a liquid medium, which was surrounded by permanent magnets. Air was introduced through a tube to inject bubbles. Two magnet configurations, north and south, were used as perturbation. Scenedesmus obliquus and Nannochloropsis gaditana, growing in Medium 1 and 2, were subjected to the bubbly flow and SMFs. Differences between media were mainly due to conductivity (0.09 S/m for Medium 1 and 4.3 S/m for Medium 2). Joule dissipation ( P ) increased with the magnetic flux density ( B 0 ), being 4 orders of magnitude higher in Medium 2 than in 1. Conversely, the time constant ( τ P ) depended on B 0 , being nearly constant for Medium 1 and decreasing at 449 s/T for Medium 2. Dissipation occurred with the same τ P (235 s) in Medium 1 and 2 at B 0 = 0.5 T. In Species 1, the SMF effect was inhibitory. For Species 2, a higher enzymatic activity was observed. For superoxide dismutase, the relative difference was 78% with the north and 115% with the south configuration compared to the control values. For the catalase, differences of 29% with the north and 23% with the south configuration compared to control condition were obtained.

Synchrotron x-ray powder diffraction studies in pulsed magnetic fields

2006 ◽  
Vol 77 (6) ◽  
pp. 063903 ◽  
Author(s):  
P. Frings ◽  
J. Vanacken ◽  
C. Detlefs ◽  
F. Duc ◽  
J. E. Lorenzo ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Powder Diffraction ◽  
Pulsed Magnetic Fields ◽  
X Ray

X-ray diffraction experiments under pulsed magnetic fields above 30T

2005 ◽  
Vol 238 (1-4) ◽  
pp. 233-236 ◽  
Author(s):  
T. Inami ◽  
K. Ohwada ◽  
Y.H. Matsuda ◽  
Y. Ueda ◽  
H. Nojiri ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Pulsed Magnetic Fields ◽  
X Ray Diffraction ◽  
X Ray

scholarly journals Neutron and X-ray Diffraction from Exotic Magnets in Pulsed Magnetic Fields

2014 ◽  
Vol 70 (a1) ◽  
pp. C149-C149
Author(s):  
Bruce Gaulin
Keyword(s):  
Magnetic Field ◽  
Low Temperature ◽  
Magnetic Fields ◽  
Capacitor Bank ◽  
Pulsed Magnetic Fields ◽  
New Materials ◽  
X Ray Diffraction ◽  
Time Resolved ◽  
X Ray ◽  
Helmholtz Coils

Magnetic fields obtained by discharging a large capacitor bank through Helmholtz coils can be produced in excess of 25 T for relatively short periods of time, ~ 1 msec and longer. When combined with modern facilities for diffraction at modern neutron and synchrotron x-ray sources, one can study the structure and phase diagrams of new materials under extremes of magnetic field. I will present two such studies, each focussing on a new magnetic material which exhibit exotic low temperature states. I will show time-resolved neutron Laue diffraction on the multiferroic magnet MnWO4 [1], and time-resolved synchrotron x-ray studies of large magneto-elastic effects in the geometrically-frustarted pyrochlore magnet Tb2Ti2O7 [2], both in magnetic fields up to ~ 30 T. Such studies of new materials in extreme sample environments can be very revealing as to the nature of their exotic low temperature states.

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