Study of the Pt-rich nanostructured FePt and CoPt alloys: oddities of phase composition

N.S. Zakharov ORCID logo , I.N. Tikhonova, Y.A. Zakharov, A.N. Popova ORCID logo , V.M. Pugachev, D.M. Russakov показать трудоустройства и электронную почту
Получена 17 сентября 2022; Принята 18 ноября 2022;
Эта работа написана на английском языке
Цитирование: N.S. Zakharov, I.N. Tikhonova, Y.A. Zakharov, A.N. Popova, V.M. Pugachev, D.M. Russakov. Study of the Pt-rich nanostructured FePt and CoPt alloys: oddities of phase composition. Письма о материалах. 2022. Т.12. №4s. С.480-485


Experimental refinement of monophase state regions on the phase diagrams parts of FePt and CoPt alloysNanoparticles of the FePt and CoPt alloys are studied. Detailed structural-phase data on the platinum-rich nanosystems has been obtained using a combination of X-ray diffraction (XRD), selected-area electron diffraction (SAED), high-resolution transmission electron microscopy (HR-TEM) in a scanning transmission electron microscope, in addition with derivatography in coupled with the simultaneous mass spectrometry, and elemental analysis of the samples. The upper limits of Fe and Co solubility in Pt and their temperature dependencies have been defined. It is shown that, if Fe or Co contents are above the solubility limits, there is not only the diffraction-detectable phases of FCC solid solutions but also undetectable phases by XRD-method, probably, it is the intermetallic compound of L12 structure (Fe1−xPt3+x or Co1−xPt3+x) or solid solution containing more amount of Fe and Co. A model of low-temperature transformation [A1‑type (FCC FeaPt1−a) → A1 (FCC Fea−xPt1−a+x) + A1undetectable phase (Fea+xPt1−a−x)] when samples are heated (100 – 500°C) is proposed. The model is based on that the crystals are nano-sized and the diffusion of Fe and Co in comparison with Pt is predominant. Therefore, diffraction-undetectable phases can be existed. According to the results of derivatography and mass spectrometry methods, there is no partial oxidation of Fe and Co in the FCC phase. Therefore, oxidation is not the cause of the observed effects.

Ссылки (25)

1. Z. Sun, D. Zhao, X. Wang et al. J. Alloys Compd. 870, 159384 (2021). Crossref
2. Z. Wen, Y. Wang, C. Wang. Int. J. Mater. Res. 113 (5), 428 (2022). Crossref
3. С. Jongjaihan, А. Kaewrawang. Micromachines. 13 (10), 1559 (2022). Crossref
4. D. Kaya, I. Adanur, M. Akyol, et. al. J. Mol. Struct. 1224, 128999 (2021). Crossref
5. J. E. Wittig, J. Bentley, L. F. Allard. Ultramicroscopy. 176, 218 (2017). Crossref
6. W. Pei, D. Zhao, C. Wu et al. ACS Appl. Nano Mater. 3 (2), 1098 (2020). Crossref
7. U. Bozuyuk, E. Suadiye, A. Aghakhani et al. M. Sitti. Adv. Funct. Mater. 32 (8), 2109741 (2022). Crossref
8. D. Li, N. Poudyal, V. Nadwana, et al. J. App. Phys. 99 (8), 08E911 (2006). Crossref
9. R. Medwal, N. Sehdev, S. Fyyapoorni. Appl. Phys. A. 109 (2), 403 (2012). Crossref
10. J. Li, S. Sharma, X. Liu et al. Joule. 3 (1), 124 (2019). Crossref
11. M. Islam, M. S. I. Sarker, T. Nakamura et al. Mater. Chem. Phys. 269, 124727 (2021). Crossref
12. B. Bian, G. Chen, Q. Zheng et al. Small. 14 (34), 1801184 (2018). Crossref
13. X. Zhang, F. Zhang, Y. Zhang et al. J. Supercond. Nov. Magn. 31 (8), 2553 (2018). Crossref
14. A. Lyberatos. Phys. B: Condens. Matter. 576, 411741 (2020). Crossref
15. F. M. Abel, V. Tzitzios, E. Devlin et al. ACS Appl. Nano Mater. 2 (5), 3146 (2019). Crossref
16. V. M. Pugachev, Yu. A. Zakharov, A. N. Popova et al. J. Phys. Conf. Ser. 1749 (1), 012036 (2021). Crossref
17. Yu. A. Zakharov, V. M. Pugachev, K. A. Korchuganova, et. al. J. Struct. Chem. 61 (6), 994 (2020). Crossref
18. N. S. Zakharov, A. N. Popova, Y. A. Zakharov. J. Phys. Conf. Ser. 1749 (1), 012012 (2021). Crossref
19. Yu. A. Zakharov, N. S. Zakharov, A. N. Popova, et. al. Butlerov Comm. 67 (7), 79 (2020). (in Russian) [Ю. А. Захаров, Н. С. Захаров, А. Н. Попова, Д. М. Руссаков. Бутлеровские сообщения. 67 (7), 79 (2020).]. Crossref
20. N. S. Zakharov, A. N. Popova, Yu. A. Zakharov, et. al. Chem. Phys. 41 (7), 84 (2022). (in Russian) [Н. С. Захаров, А. Н. Попова, Ю. А. Захаров, В. М. Пугачев, Д. М. Руссаков. Химическая физика. 41 (7), 84 (2022).]. Crossref
21. T. Mehaddene, E. Kentzinger, B. Hennion et al. Phys. Rev. B. 69 (2), 024304 (2004). Crossref
22. H. Okamoto: Phase Diagrams of Binary Iron Alloys. V. 9, 1st ed. ASM International (1993) 472 p.
23. S. I. Konorev, R. Kozubski, M. Albrecht et al. Comput. Mater. Sci. 192, 110337 (2021). Crossref
24. O. Ersen, C. Goyhenex, V. Pierron-Bohnes. Phys. Rev. B. 78 (3), 035429 (2008). Crossref
25. P. Andreazza, V. Pierron-Bohnes, F. Tournus, et al. Surf. Sci. Rep. 70 (2), 188 (2015). Crossref

Другие статьи на эту тему

Финансирование на английском языке