Počet záznamů: 1

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

  1. 1.
    0339967 - UFM-A 2010 RIV SR eng J - Článek v odborném periodiku
    Ćosović, V. - Talijan, N. - Grujić, A. - Stajić-Trošić, J. - Žák, Tomáš - Lee, Z. - Radmilović, V.
    Study of Nd-Fe-B Alloys with Nonstoichiometric Nd Content in Optimal Magnetic State.
    Science of Sintering. Roč. 41, č. 2 (2009), s. 211-220 ISSN 0350-820X
    Grant CEP: GA MŠk 1M0512
    Výzkumný záměr: CEZ:AV0Z20410507
    Klíčová slova: Rapid quenched Nd-Fe-B alloys * Nonstoichiometric Nd content * Phase composition * Grain size * Magnetic properties
    Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
    Impakt faktor: 0.486, rok: 2009

    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), Fe-57 Mossbauer spectroscopic phase analysis (MS), electron microscopy (TEM), high resolution TEM (HREM) and Superconducting Quantum Interference Device (SQUID) magnetometer. The alloy with the reduced Nd content (Nd4.5Fe77B18.5) was found to have the nanocomposite structure of Fe3B/Nd2Fe14B and partly alpha-Fe/Nd2Fe14B, with mean grain size below 30 nm. On the other side, the overstoichiometric Nd14Fe79B7 alloy has almost a monophase structure with the dominant content of the hard magnetic phase Nd2Fe14B (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.
    Trvalý link: http://hdl.handle.net/11104/0183324