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Article

Full Variation of Site Substitution in Ni-Mn-Ga by Ferromagnetic Transition Metals

1
Institute of Physics of the Czech Academy of Sciences, Na Slovance 1999/2, 182 21 Prague, Czech Republic
2
Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Břehová 7, 115 19 Prague, Czech Republic
3
Faculty of Mathematics and Physics, Charles University, Ke Karlovu 5, 121 16 Prague 2, Czech Republic
*
Author to whom correspondence should be addressed.
Academic Editors: Alberto Moreira Jorge Junior and Sergey Kustov
Metals 2021, 11(6), 850; https://doi.org/10.3390/met11060850
Received: 14 April 2021 / Revised: 11 May 2021 / Accepted: 17 May 2021 / Published: 21 May 2021
(This article belongs to the Special Issue Recent Development in Magnetic Shape Memory Alloys)
Systematic doping by transition elements Fe, Co and Ni on each site of Ni2MnGa alloy reveal that in bulk material the increase in martensitic transformation temperature is usually accompanied by the decrease in ferromagnetic Curie temperature, and vice versa. The highest martensitic transformation temperature (571 K) was found for Ni50.0Mn25.4(Ga20.3Ni4.3) with the result of a reduction in Curie temperature by 55 K. The highest Curie point (444 K) was found in alloy (Ni44.9Co5.1)Mn25.1Ga24.9; however, the transition temperature was reduced to 77 K. The dependence of transition temperature is better scaled with the Ne/a parameter (number of non-bonding electrons per atom) compared to usual e/a (valence electrons per atom). Ne/a dependence predicts a disappearance of martensitic transformation in (Ni45.3Fe5.3)Mn23.8Ga25.6, in agreement with our experiment. Although Curie temperature usually slightly decreases while the martensitic transition increases, there is no significant correlation of Curie temperature with e/a or Ne/a parameters. The doping effect of the same element is different for each compositional site. The cascade substitution is discussed and related to the experimental data. View Full-Text
Keywords: Ni-Mn-Ga; doping; ferromagnetism; transition metals; Heusler alloy Ni-Mn-Ga; doping; ferromagnetism; transition metals; Heusler alloy
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MDPI and ACS Style

Kopecký, V.; Rameš, M.; Veřtát, P.; Colman, R.H.; Heczko, O. Full Variation of Site Substitution in Ni-Mn-Ga by Ferromagnetic Transition Metals. Metals 2021, 11, 850. https://doi.org/10.3390/met11060850

AMA Style

Kopecký V, Rameš M, Veřtát P, Colman RH, Heczko O. Full Variation of Site Substitution in Ni-Mn-Ga by Ferromagnetic Transition Metals. Metals. 2021; 11(6):850. https://doi.org/10.3390/met11060850

Chicago/Turabian Style

Kopecký, Vít, Michal Rameš, Petr Veřtát, Ross H. Colman, and Oleg Heczko. 2021. "Full Variation of Site Substitution in Ni-Mn-Ga by Ferromagnetic Transition Metals" Metals 11, no. 6: 850. https://doi.org/10.3390/met11060850

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