Počet záznamů: 1

An overstoichiometric Nd–Fe–B hard magnetic material

  1. 1.
    0353549 - UFM-A 2011 RIV SR eng J - Článek v odborném periodiku
    Žák, Tomáš - Talijan, N. - Ćosović, V. - Stajić-Trošić, J. - Grujić, A.
    An overstoichiometric Nd–Fe–B hard magnetic material.
    Journal of the Serbian Chemical Society. Roč. 75, č. 9 (2010), s. 1271-1277 ISSN 0352-5139
    Grant CEP: GA MŠk 1M0512
    Výzkumný záměr: CEZ:AV0Z20410507
    Klíčová slova: rapid quenched Nd–Fe–B * overstoichiometric Nd content * Mössbauer phase analysis * XRD * magnetic properties
    Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
    Impakt faktor: 0.725, rok: 2010

    A commercial Nd-rich Nd–Fe–B-based hard magnetic material was studied. The thermomagnetic curve showed clearly besides Curie points of the Nd2Fe14B phase and α-Fe also another critical temperature. Mössbauer (MS) phase analysis and X-ray diffraction analysis (XRD) showed in addition to the commonly known phases Nd2Fe14B and NdFe4B4 also some paramagnetic and ferromagnetic iron atoms (MS) and Fe17Nd2 intermetallics (XRD). During the exerted thermal treatment, the content of the Nd2Fe14B and NdFe4B4 phases remained almost unchanged, while iron atoms from remnant minor phases built a separate α-Fe phase. The XRD pattern also showed the presence of some minor Nd phase. The results of Squid measurements suggest a nanocrystalline decoupled structure of the Nd-rich alloy in the optimized magnetic state. Measurement of the magnetization loop showed, in spite of small changes in the phase composition, that magnetic properties of the quality material deteriorated during the thermal treatment.
    Trvalý link: http://hdl.handle.net/11104/0192777