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Influence of Fe Addition on the Martensitic Transformation, Structure and Magnetic Properties of Metamagnetic Ni-Co-Mn-Sn Alloys

100%
Wójcik A., Maziarz W., Szczerba M., Sikora M., Hawełek Ł., Czaja P.
Acta Physica Polonica A
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2016
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vol. 130
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issue 4
1026-1028
EN
In this study the effect of Fe for Ni substitution in Ni₄₄Co₆Mn₃₉Sn₁₁ metamagnetic shape memory alloys on their structure, magneto-structural transformation characteristics, magnetic and magnetocaloric properties was studied. The results show that the structure and martensite transformation behavior strongly depends on the Fe concentration. The martensitic transformation temperature decreases with 1 at.% of Fe and is suppressed with higher Fe content. It was further found that substitution of Fe for Ni leads to lowering of the value of magnetic entropy change.
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Electrical and Magnetic Properties of Selected Fe-Based High Entropy Alloys

84%
Perzyńska K., Go A., Szymański K., Biernacka M., Hawełek Ł., Kalska-Szostko B., Oleszak D., Rećko K., Waliszewski J., Zaleski P.
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vol. 126
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issue 4
999-1004
EN
The electrical and magnetic properties of Fe_{0.5}A_{0.5} alloys are presented, where the A corresponds to various compositions of the elements: A = (Al, Si, V, Cr, Co, Ga, Ni, Ge). The system is closely related to the known family of high entropy alloys. The samples were synthesized by arc melting and/or melt spinning technique and exhibit a regular type of crystal structure. Lattice parameters are systematically smaller than the estimates based on metallic radiuses of the elements. Temperature dependences of resistivities show maxima for some compositions. This behavior is consistent with results of electronic structure calculations, where a low density of states at the Fermi level were predicted. Also the measured magnetic moments are in good agreement with results of calculations. It is thus presented that some physical properties can be designed by appropriate choice of the chemical composition within the same simple structure.
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