Abstract
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 compound ( and 0.85) as function of temperature by means of neutron powder diffraction. Thermal dependence of the lattice parameters, formation of -(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 -(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 [ /kg and T] are maintained after the thermal treatments up to 900 K. This study demonstrates that the nitrides with the Mo stabilizing element offer good prospects for a bulk magnet provided an adequate processing route is found.
2 More- Received 27 September 2020
- Revised 17 December 2020
- Accepted 12 January 2021
DOI:https://doi.org/10.1103/PhysRevMaterials.5.014415
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