Nitrogenation and sintering of (Nd-Zr)Fe10Si2 tetragonal compounds for permanent magnets applications

Nd-xZrxFe10Si2 alloys have been prepared in the tetragonal ThMn12-type structure by arc-melting and melt spinning and then nitrogenated to improve their magnetic properties. For x = 0.4 and 0.6 the Curie temperature and magnetic anisotropy fields increases from 280 to 300 °C to about 390 °C and from...

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Bibliographic Details
Published in:Journal of alloys and compounds 2019-05, Vol.784 (C), p.996-1002
Main Authors: Barandiaran, J.M., Martin-Cid, A., Schönhöbel, A.M., Garitaonandia, J.S., Gjoka, M., Niarchos, D., Makridis, S., Pasko, A., Aubert, A., Mazaleyrat, F., Hadjipanayis, G.
Format: Article
Language:English
Subjects:
Chemistry
Condensed Matter
Curie temperature
Electric arc melting
High temperature
Magnetic anisotropy
Magnetic properties
Magnetic saturation
Magnetism
Materials Science
Melt spinning
Metallurgy & Metallurgical Engineering
Nitrogenation
Permanent magnets
Physics
Plasma sintering
Raw materials
Spark plasma sintering
Spinning (materials)
Zirconium compounds
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Summary:Nd-xZrxFe10Si2 alloys have been prepared in the tetragonal ThMn12-type structure by arc-melting and melt spinning and then nitrogenated to improve their magnetic properties. For x = 0.4 and 0.6 the Curie temperature and magnetic anisotropy fields increases from 280 to 300 °C to about 390 °C and from 2.8 to 3 Tesla to 4.5–5 Tesla respectively. The saturation magnetization remains almost unchanged. The nitrogenated powders were processed by Spark Plasma Sintering (SPS) leading to compact pellets, which retain the full Nitrogen content and magnetic properties up to 600 °C, but segregated Fe-Si at elevated temperatures. Nitrogenation and SPS processing are, therefore, appropriate for sintering metastable materials such as (NdZr)Fe10Si2 into compact material without loosing functional properties. This opens a way towards a new family of permanent magnets, lean of critical raw materials. •Tetragonal Nd-xZrxFe10Si2 alloys have been nitrogenated to 1.5 atoms/f.u..•Curie temperature and magnetic anisotropy field increase by 100 °C and 2 Tesla.•Mössbauer spectra show changes in Bhf and QS that explain the improved properties.•Nitrogenated powders Spark Plasma Sintered (SPS) at 600 °C retain full properties.•These alloys are the base for a new family of permanent magnets, with 3–4.6 at.% Nd.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2019.01.044