Effect of Ni doping on stabilization of Sm(Co1−x Fe x )5 compound: thermodynamic calculation and experiment
| Autor: | A. V. Kamynin, M.V. Zheleznyi, A I Bazlov, I. S. Gavrikov, D. Yu. Karpenkov, E. S. Khotulev |
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| Rok vydání: | 2020 |
| Předmět: |
Materials science
Enthalpy Analytical chemistry chemistry.chemical_element 02 engineering and technology Crystal structure Coercivity 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Standard enthalpy of formation Magnetization Nickel chemistry Transition metal Remanence 0103 physical sciences General Materials Science 010306 general physics 0210 nano-technology |
| Zdroj: | Journal of Physics: Condensed Matter. 32:425803 |
| ISSN: | 1361-648X 0953-8984 |
| DOI: | 10.1088/1361-648x/aba0db |
| Popis: | The calculation of the heat of formation of Sm(Co1-x-y Fe x Ni y )5 compound using homemade software in the framework of Miedema's model was carried out. In addition we investigated the influence of the probability of occupation the transition metals sites by 3d-ions, in particular, equiprobable distribution of 3d-ions among 2c and 3g sites and selective distribution Co/Ni-(2c), Fe-(3g). The maximal Fe and Ni doping ranges, where Sm(Co1-x-y Fe x Ni y )5 phase with the CaCu5-type crystal structure stable, were estimated for both types of distribution. The corresponding values of the number of 3d-electrons per atom were 7.23 (Fe/Co/Ni-(2c, 3g)) and 7.3 (Co/Ni-(2c), Fe-(3g)). Based on calculation the Sm(Co1-x-y Fe x Ni y )5 (x = 0.15, 0.3, 0.45; y = 0.05, 0.1, 0.15) melt-spun ribbons were synthesized. The maximal doping level of x = 0.5 and y = 0.2 was experimentally determined for Fe and Ni atoms, respectively. These values are in good agreement with the theoretical prediction, assumed equiprobable distribution of 3d-ions among transition metal sites. The best among the series in terms of energy product Sm(Co0.6Fe0.3Ni0.1)5 sample possesses a coercivity of 10.9 kOe and remanent magnetization of 51 emu g-1. |
| Databáze: | OpenAIRE |
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