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NANOPOWDERS OF R2FE14B-TYPE COMPOUNDS IN HIGH MAGNETIC FIELDS: THE EFFECTS OF SUBSTITUTIONAL AND INTERSTITIAL ATOMS ON INTER-SUBLATTICE EXCHANGE INTERACTION

1,2,3 PAUKOV Michael
Co-authors:
4 IVANOV Lev 4 TERESHINA Irina 3,5 TERESHINA-CHITROVA Evgenia 6 GORBUNOV Denis 3 ANDREEV Alexander 4 PYATAKOV Alexander 4 GRANOVSKY Sergey 7 DOERR Mathias 8 DRULIS Henryk
Institutions:
1 Nuclear Fuel Cycle Department, Centrum Vyzkumu Rez, Hlavni 130, Husinec-Rez
2 Immanuel Kant Baltic Federal University, Kaliningrad, Russia
3 Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic, EU
4 Faculty of Physics M.V. Lomonosov Moscow State University, Moscow, Russia
5 Institute of Physics ASCR, Prague, Czech Republic, EU
6 Hochfeld-Magnetlabor Dresden (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany
7 Technische Universität Dresden, Dresden, Germany, EU
8 Institute of Low Temperatures and Structure Research, Polish Academy of Sciences, Wroclaw, Poland, EU
Conference:
29th International Conference on Metallurgy and Materials, Brno, Czech Republic, EU, May 20 - 22, 2020
Proceedings:
Proceedings 29th International Conference on Metallurgy and Materials
Pages:
1000-1006
ISBN:
978-80-87294-97-0
ISSN:
2694-9296
DOI:
https://doi.org/10.37904/metal.2020.3597
Published:
27th July 2020
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
496 views / 284 downloads
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Abstract

The fundamental magnetic characteristics of R2Fe14B intermetallics are highly sensitive to atomic substitutions and interstitial absorption of light elements. In this work, both were combined, and the influence of the substitutions in the R-sublattice and hydrogen absorption on the magnetization of (RR’)2Fe14BHx (R is Tm or Er, and R’ is Nd) in magnetic fields up to 58T was studied. (Tm0.5Nd0.5)2Fe14B and (Er0.5Nd0.5)2Fe14B were prepared. By using direct hydrogen absorption, (R0.5Nd0.5)2Fe14BHx compounds were obtained with hydrogen content 0≤x≤5.5. Magnetic measurements of both the parent alloys and their hydrides were carried out on nanopowders. The strength of the inter-sublattice coupling in (Tm0.5Nd0.5)2Fe14B, (Er0.5Nd0.5)2Fe14B and their hydrides is estimated by analysing high-field magnetization data. Itis shown that hydrogenation weakens the inter-sublattice exchange interaction up to 45 %. (Tm0.5Nd0.5)2Fe14B, with the maximum hydrogen content of 5.5 at.H/f.u., reaches the field-induced ferromagnetic state at about 55 T.

Keywords: Rare earth, intermetallic, powder metallurgy, magnetism in solids, hydride

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