57Fe Mössbauer spectroscopic phase analysis of nonstoichiometric Nd-Fe-B alloys

0353552 - ÚFM 2011 RIV SR eng C - Conference Paper (international conference)
Ćosović, V. - Talijan, N. - Žák, Tomáš - Živkovič, D. - Stajić-Trošić, J. - Grujić, A.
57Fe Mössbauer spectroscopic phase analysis of nonstoichiometric Nd-Fe-B alloys.
IOC 2010 PROCEEDINGS. Beograd: University of Belgrade - Technical Faculty in Bor, 2010 - (Ivanov, S.; Živković, D.), s. 21-24. ISBN 978-86-80987-79-8.
[International October Conference on Mining and Metallurgy. Kladovo (SR), 10.10.2010-13.10.2010]
R&D Projects: GA MŠMT 1M0512
Institutional research plan: CEZ:AV0Z20410507
Keywords : Nd-Fe-B alloys * Mössbauer spectroscopy * thermomagnetic measurements * phase composition * magnetic properties
Subject RIV: BM - Solid Matter Physics ; Magnetism

Abstract Changes in the phase composition and magnetic properties in regard to the optimized magnetic state of the rapid quenched nonstoichiometric Nd-Fe-B alloys (Nd45F77B18.5, Nd14Fe79B7) caused by thermomagnetic measurement (TM) were studied using 57Fe Mössbauer spectroscopic phase analysis (MS) and SQUID magnetic measurements. The obtained experimental results for both alloys show decrease of the amount of main hard magnetic Nd2Fe14B phase and increase of the amount of soft magnetic phases. The main thermal decomposition products are alpha-Fe phase and a number of different Fe-B phases which are responsible for the observed quality loss of hard magnetic properties.
Permanent Link: http://hdl.handle.net/11104/0192779