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Control of Nd-Fe-B Morphology as Function of the PVP Concentration Using Electrospinning Process

Eom Nu Si A., Haq Muhammad Aneeq, Lee Jimin, Lim Kyoung Mook, Kim Taek-Soo, Choa Yong-Ho, Kim Bum Sung

Archives of Metallurgy and Materials

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2020

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Vol. 65, iss. 3

993--996

EN

In this study, we demonstrate a facile and cost-effective way to synthesize Nd-Fe-B of various shapes such as powders, rods and fibers using electrospinning, heat-treatment and washing procedures. Initially Nd-Fe-B fibers were fabricated using electrospinning. The as-spun Nd-Fe-B fibers had diameters ranging 489 to 630 nm depending on the PVP concentration in reaction solutions. The different morphologies of the Nd2Fe14B magnetic materials were related to the difference in thickness of the as-spun fibers. The relationships between the as-spun fiber thickness, the final morphology, and magnetic properties were briefly elucidated. The intrinsic coercivity of Nd2Fe14B changed with the change in morphology from powder (3908 Oe) to fiber (4622 Oe). This work demonstrates the effect of the Nd-Fe-B magnetic properties with morphology and can be extended to the experimental design of other magnetic materials.

2

Characterization of phase constitution and magnetic properties of the hard magnetic nanocrystalline Nd9.5Fe63.65B21.85Nb5 alloy ribbons

Szwaja M., Pawlik K., Wysłocki J. J., Pawlik P., Gębara P.

Nukleonika

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2013

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Vol. 58, No. 1

159-163

EN

In order to investigate the phase constitution of the nanocrystalline Nd9.5Fe63.65B21.85Nb5 alloy ribbons in the as-cast state and after short-time annealing Mossbauer study has been carried out. In as-cast state, ribbon samples were not fully amorphous but revealed soft magnetic properties. X-ray diffraction analysis showed the presence of hard magnetic Nd2Fe14B, metastable Nd2Fe23B3 and paramagnetic Nd1+epsilonFe4B4 phases in annealed samples. Mossbauer spectroscopy was used to determine the fractions of constituent phases formed during annealing of ribbons. Magnetic measurements were made with a vibrating sample magnetometer (VSM) and have shown that with increasing annealing temperature the remanence polarization Jr and maximum energy product (BH)max values were increasing.

3

Magnetic properties of the nanocrystalline Nd9.6Fe64.32Nb4B22.08 alloy ribbons

Szwaja M., Pawlik P., Wysłocki J. J., Gębara P.

Archives of Metallurgy and Materials

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2012

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Vol. 57, iss. 1

233-236

EN

Studies of magnetic properties and phase constitution of nanocrystalline Nd9.6Fe64.32Nb4B22.08 alloy ribbon samples are presented. In as-cast state, ribbon samples were fully amorphous and soft magnetic. Subsequent annealing resulted in an evolution of the phase constitution together with change of their magnetic properties. The main phase observed in the material is Nd2Fe14B hard magnetic phase.

PL

W pracy badano własności magnetyczne oraz skład fazowy taśm wytworzonych ze stopu Nd9,6Fe64,32Nb4B22,08. Taśma w stanie po odlaniu ma amorficzną budowę i wykazuje miękkie właściwości magnetyczne. Wygrzewanie taśm powoduje zmiany składu fazowego wraz ze zmianą ich właściwości magnetycznych. Podstawową fazą obserwowaną w badanym materiale jest faza magnetycznie twarda Nd2Fe14B.