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Lee, Zonghoon
Atomic-Scale Electron Microscopy (ASEM) Lab
Research Interests
  • Advanced Transmission Electron Microscopy (TEM/STEM), in Situ TEM, graphene, 2D materials, low-dimensional crystals, nanostructured materials

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Study of Nd-Fe-B Alloys with Nonstoichiometric Nd Content in Optimal Magnetic State

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Title
Study of Nd-Fe-B Alloys with Nonstoichiometric Nd Content in Optimal Magnetic State
Author
Cosovic, V.Talijan, N.Grujic, A.Stajic-Trosic, J.Zak, T.Lee, ZonghoonRadmilovic, V.
Keywords
Rapid quenched Nd-Fe-B alloys; Nonstoichiometric Nd content; Phase composition; Grain size; Magnetic properties
Issue Date
200905
Publisher
INT INST SCIENCE SINTERING (I I S S)
Citation
SCIENCE OF SINTERING, v.41, no.2, pp.211 - 220
Abstract
Characterization of two rapid-quenched Nd-Fe-B alloys with nonstoichiometric Nd content in the optimized magnetic state was carried out using the X-ray diffractometry (XRD), (57)Fe Mossbauer spectroscopic phase analysis (MS), electron microscopy (TEM), high resolution TEM (HREM) and Superconducting Quantum Interference Device (SQUID) magnetometer. The experimental results demonstrate the fundamental difference in the structure and magnetic properties of the two investigated alloys in the optimized magnetic state. The Nd-Fe-B alloy with the reduced Nd content (Nd(4.5)Fe(77)B(18.5)) was found to have the nanocomposite structure of Fe(3)B/Nd(2)Fe(14)B and partly alpha-Fe/Nd(2)Fe(14)B, with mean grain size below 30 nm. On the other side, the overstoichiometric Nd(14)Fe(79)B(7) alloy has almost a monophase structure with the dominant content of the hard magnetic phase Nd(2)Fe(14)B (up to 95 wt. %) and a mean crystallite size about 60 nm, as determined by XRD and TEM analysis. The results of magnetic measurements on SQUID magnetometer also suggest the nanocomposite structure of the Nd-low alloy and nanocrystalline decoupled structure of the Nd-rich alloy after the optimal heat treatment.
URI
http://scholarworks.unist.ac.kr/handle/201301/5023
DOI
http://dx.doi.org/10.2298/SOS0902209C
ISSN
0350-820X
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MSE_Journal Papers
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