scholarly journals Phase Structure and Magnetic Properties of Fe-Nb-B-Pt Type of Bulk Nanocrystalline Alloys

2014 ◽  
Vol 126 (1) ◽  
pp. 174-175 ◽  
Author(s):  
G. Ziółkowski ◽  
A. Chrobak ◽  
N. Randrianantoandro ◽  
J. Klimontko
Keyword(s):  
Magnetic Properties ◽  
Phase Structure ◽  
Nanocrystalline Alloys ◽  
Bulk Nanocrystalline

Phase Structure and Magnetic Properties of Fe-Nb-B-Nd Type of Bulk Nanocrystalline Alloys

2013 ◽  
Vol 203-204 ◽  
pp. 302-305
Author(s):  
Grzegorz Ziółkowski ◽  
Artur Chrobak ◽  
Joanna Klimontko
Keyword(s):  
Magnetic Properties ◽  
Coercive Field ◽  
Phase Structure ◽  
Maximum Energy ◽  
Nanocrystalline Alloys ◽  
Preparation Technique ◽  
Casting Technique ◽  
Maximum Energy Product ◽  
Energy Product ◽  
Bulk Nanocrystalline

In this work we present phase structure and magnetic properties of the (Fe80Nb6B14)1-x Ndx (x=0.08, 0.12, 0.16) bulk nanocrystalline alloys prepared by making use of mould casting technique. The applied mould allows obtaining bulk rods of 1.5 mm in diameter and about 3 cm in length. Phase structure and magnetic properties were carefully examined. It was shown that the applied preparation technique is favorable to nanocrystallization of the alloys, which was confirmed by the XRD diffraction. For all studied alloys, one can observe a formation of mainly Nd2Fe14B (hard magnetic) and Fe phases with different contributions dependently on the x parameter. It was also shown that the alloy of (Fe80Nb6B14)0.92Nd0.08 has the best hard magnetic properties with the coercive field, magnetic saturation and maximum energy product equal to 0.2 T, 117 emu/g and 13.4 kJ/m3, respectively (at room temperature). Moreover, the coercive field and maximum energy product are gradually deteriorating with increasing of rare earth addition.

Phase structure and magnetic properties of Fe–Nb–B–Tb type of bulk nanocrystalline alloys

2012 ◽  
Vol 537 ◽  
pp. 154-158 ◽  
Author(s):  
A. Chrobak ◽  
G. Ziółkowski ◽  
N. Randrianantoandro ◽  
J. Klimontko ◽  
G. Haneczok
Keyword(s):  
Magnetic Properties ◽  
Phase Structure ◽  
Nanocrystalline Alloys ◽  
Bulk Nanocrystalline

Effect of Ball Milling on Structure and Magnetic Properties of Fe-Nb-B-Tb Bulk Nanocrystalline Alloys

2013 ◽  
Vol 203-204 ◽  
pp. 280-283 ◽  
Author(s):  
Artur Chrobak ◽  
Joanna Klimontko ◽  
Marian Kubisztal ◽  
Grzegorz Haneczok ◽  
Grzegorz Ziółkowski ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Phase Composition ◽  
Ball Milling ◽  
Phase Structure ◽  
Nanocrystalline Alloys ◽  
Structure Changes ◽  
Bulk Nanocrystalline

It was shown that pulverization of the examined alloys cause a decrease of mean diameters of nanocrystallites, a change of the phase composition and affects magnetic properties. For the alloy with x=0.08 magnetization remanence at T=300 K increases about two times with remaining constant Hc while for x=0.12 Hc decreases from 1.16 t to 0.36 T. The observed effects were attributed to the phase structure changes and breaking of direct magnetic intergrain coupling

Magnetic Properties of Fe-Nb-B-Re (Re=Y, Gd) Bulk Nanocrystalline Alloys

2011 ◽  
Vol 170 ◽  
pp. 114-117 ◽  
Author(s):  
Artur Chrobak ◽  
G. Haneczok ◽  
Grażyna Chełkowska ◽  
Anna Bajorek ◽  
Jerzy Kansy ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Room Temperature ◽  
Preparation Method ◽  
Nanocrystalline Alloys ◽  
Squid Magnetometer ◽  
Casting Technique ◽  
Magnetic Hardening ◽  
Bulk Nanocrystalline ◽  
Mould Casting ◽  
Magnetic Balance

Magnetic properties of the Fe76.2Nb5.7B13.3Gd4.8, Fe69.6Nb5.2B12.2Gd13, Fe76.2Nb5.7B13.3Y4.8, Fe69.6Nb5.2B12.2Y13 bulk nanocrystalline alloys (mould casting technique) are presented and discussed. Measurements were carried out by the means of SQUID magnetometer (temperature range 2 K – 400 K, field up to 7 T) and magnetic balance (temperatures up to 1100 K). Microstructure was studied by the Mössbauer spectroscopy at room temperature. It was shown that the samples are nonocrystalline with α-Fe and different Fe-B, Y/Gd-Fe or Y/Gd-Fe-B compounds. The preparation method as well as the Gd addition causes a magnetic hardening of the studied alloys.

scholarly journals Influence of Transition and Rare Earth Elements on Magnetic Properties of Fe-Nb-B-M (M = Ni, Ag, Gd, Tb) Bulk Nanocrystalline Alloys

2012 ◽  
Vol 121 (5-6) ◽  
pp. 1266-1269 ◽  
Author(s):  
G. Ziółkowski ◽  
N. Randrianantoandro ◽  
A. Chrobak ◽  
J. Klimontko ◽  
M. Kądziołka-Gaweł ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Rare Earth ◽  
Rare Earth Elements ◽  
Nanocrystalline Alloys ◽  
Bulk Nanocrystalline

Structure, magnetic properties and magnetostriction in NdFe1.9 bulk nanocrystalline alloys

2013 ◽  
Vol 563 ◽  
pp. 289-292 ◽  
Author(s):  
Y.G. Shi ◽  
C.C. Hu ◽  
X.G. Zhou ◽  
J.Y. Fan ◽  
D.N. Shi ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Nanocrystalline Alloys ◽  
Bulk Nanocrystalline

scholarly journals FeSiBPNbCu Bulk Nanocrystalline Alloys with High GFA and Excellent Soft-Magnetic Properties

Metals ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 219 ◽  
Author(s):  
Lei Liu ◽  
Bang Zhou ◽  
Yiqun Zhang ◽  
Aina He ◽  
Tao Zhang ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Magnetic Properties ◽  
Crystallization Temperature ◽  
Industrial Applications ◽  
Nanocrystalline Alloys ◽  
Soft Magnetic Materials ◽  
Second Phase ◽  
Soft Magnetic Properties ◽  
Soft Magnetic ◽  
Bulk Nanocrystalline

(Fe0.76Si0.09B0.1P0.05)99.3−xNbxCu0.7 (x = 0–1.5 at. %) bulk nanocrystalline alloys were prepared to investigate the alloying effects of Nb on glass forming ability, thermal stability, soft magnetic properties, and crystallization behavior. It was found that the amorphous forming ability was greatly improved with the addition of minor Nb. The thermal stability of Nb-containing alloy was significantly improved because the initial crystallization temperature and crystallization activation of the primary phase were obviously better than that of the Nb-free alloy. Further, the larger intervals of two-phase crystallization temperature and the significantly higher activation energy of crystallization of the second phase in the Nb-containing alloys favor the formation of a single α-Fe(Si) nanocrystalline structure. Moreover, Nb-containing alloys exhibit excellent soft magnetic properties, including high saturation magnetization of 1.42–1.49 T, low coercivity of around 1.0 A/m, and high permeability of about 18,000 at 1 kHz, which makes the alloys promising soft magnetic materials for industrial applications.

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