In this work, we examined the effects of the of Nd by Ce substitution and of the nitrogenation in the structural and hyperfine magnetic properties of (Nd1-xCex)1.1Fe10CoTi with x = 0, 0.5 and 1 systems. The alloys were prepared, with high pure elements, by arc-melting and the pieces were then homogenized at 1100 °C for 48 h. The nitrogenation was carried out at 450 °C for 1 h with a pressure of 0.1 MPa. The X-ray diffraction analysis allowed to identify the ThMn12-type structure mainly with average weigh fraction of 68%. The obtained tetragonal ThMn12 structure type presented an increased lattice parameter after nitrogenation for all alloys. The rhombohedral structure Th2Zn17-type is also present in the alloys and their lattice parameters do not show important changes after the nitrogenation. The Mössbauer spectra were fitted with seven sextets and a small quadrupolar component, the sextets were associated to the Fe sites in the ThMn12-type and Th2Zn17-type phases. The mean field, 〈Bhf〉, improve for all alloys after nitrogenation process. The Nd1.1Fe10CoTi (x = 0) and (Nd0.5Ce0.5)1.1Fe10CoTi (x = 0.5) alloys that present weigh fractions of 75 and 73%, respectively, with the ThMn12−type tetragonal structure present a 〈Bhf〉 of 30.9 and 31.0 T, respectively, after nitrogenation. Then, they can be possible candidates for rare earth-lean permanent magnets.
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Research was sponsored by the Army Research Laboratory and was accomplished under Cooperative Agreement Number W911NF-19-2-0030. The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the official policies, either expressed or implied, of the Army Research Laboratory or the U.S. Government. The U.S. Government is authorized to reproduce and distribute reprints for Government purposes notwithstanding any copyright notation herein. Part of the research was also sponsored by COLCIENCIAS under Contract 110671250407, and the INAPEM project (International Network on Applications of Permanent Magnets) (project EU 691235) through Vicerrectoría de Investigaciones of the Universidad del Valle. Also, part of the research was sponsored by Universidad del Valle under Contract 71181.
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This article is part of the Topical Collection on Proceedings of the IV Escuela Colombiana de Espectroscopía Mössbauer, Ibagué, Colombia, 10-12 July 2019
Edited by Jean-Marc Grenèche, Humberto Bustos Rodriguez and Juan Sebastian Trujillo Hernandez
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Sánchez, H.M., Salazar, D., Zamora, L.E. et al. Mössbauer spectroscopy in the system (Nd1-xCex)1.1Fe10CoTi with ThMn12 structure. Hyperfine Interact 241, 44 (2020). https://doi.org/10.1007/s10751-020-01716-0
- X-ray diffraction
- ThMn12-type structure
- Mössbauer spectroscopy