Magnetic Properties of Interstitially Modified Ce–Nd–Fe–Mo–N Magnets Prepared by Spark-Plasma Sintering

Kong, Jing; Zhou, Chen; Pinkerton, F. E.

doi:10.1109/tmag.2016.2528124

Cited by 7 publications

(3 citation statements)

References 13 publications

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“…Hence, it seems that nitrogen is very stable in the lattice and that the decomposition is mainly due to the formation of the secondary α-(Fe,Mo) phase, which appears to be faster than the nitrogen losses in the lattice. This was also suggested in previous studies based on Differential thermal analysis (DTA)/Thermogravimetric analysis (TG)/XRD investigations of Nd-based nitrides [18,30]. The good stability of the nitrides at elevated temperatures is mostly due to the transition element used, i.e., Mo, which allows a much better thermal stability than Ti or V [18].…”

Section: A Preliminary Structural and Magnetic Propertiessupporting

confidence: 57%

“…The changes in H c and M s are attributed to the formation of α-(Fe,Mo) as observed in the neutron powder diffractograms. This result indicates a good prospect to possibly sinter this compound by reducing the sintering temperature below 930 K. This is possible using nonconventional sintering techniques such as spark plasma sintering or hot pressing [17,[30][31][32][33]. The nitrides could also be good candidates for additive manufactured magnets [34].…”

Section: Magnetic Properties After Thermal Treatmentmentioning

confidence: 90%

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Denitrogenation process in ThMn12 nitride by in situ neutron powder diffraction

Aubert

Puente‐Orench

Porro

et al. 2021

Phys. Rev. Materials

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ThMn 12 nitrides are good candidates for high performance permanent magnets. However, one of the remaining challenges is to transfer the good properties of the powder into a useful bulk magnet. Thus, understanding the denitrogenation process of this phase is of key importance. In this study, we investigate the magnetic and structural stability of the (Nd 0.75 , Pr 0.25 ) 1.2 Fe 10.5 Mo 1.5 N x compound (x = 0 and 0.85) as function of temperature by means of neutron powder diffraction. Thermal dependence of the lattice parameters, formation of α-(Fe,Mo), as well as the nitrogen content in the nitrides are investigated by heating the compounds up to 1010 K. The decomposition takes place mainly via the formation of the α-(Fe,Mo) phase, which starts at around 900 K, whereas the nitrogen remains stable in the lattice. Additionally, we show that the magnetic properties of the nitrides [M(4 T) = 90 Am 2 /kg and H c = 0.55 T] are maintained after the thermal treatments up to 900 K. This study demonstrates that the ThMn 12 nitrides with the Mo stabilizing element offer good prospects for a bulk magnet provided an adequate processing route is found.

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Section: A Preliminary Structural and Magnetic Propertiessupporting

confidence: 57%

Section: Magnetic Properties After Thermal Treatmentmentioning

confidence: 90%

Denitrogenation process in ThMn12 nitride by in situ neutron powder diffraction

Aubert

Puente‐Orench

Porro

et al. 2021

Phys. Rev. Materials

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“…We also report the use of a very fast sintering technique: spark plasma sintering (SPS) for preparing bulk (Zr-Nd)Fe 10 Si 2 (N) pellets, and show the initial 1:12 nitrogenated phase is stable for treatments up to 600ºC, providing a way to produce sintered magnets out of the nitrogenated powders. SPS has been successfully used for sintering ferrites [18], Nd 2 Fe 14 B [19] and Sm-Co magnets [20], and recently for (Ce-Nd)(Fe-Mo)N 1:12 compounds [21]…”

mentioning

confidence: 99%

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

Barandiarán

Martín-Cid

Schönhöbel

et al. 2019

Journal of Alloys and Compounds

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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 280-300 ºC to about 390 ºC and from 2.8-3 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 600ºC, 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.

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