Structure and Magnetic Properties of the Magnetocaloric MnCoGe Modified by W

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Published: Jul 30, 2024
DOI: https://doi.org/10.12693/APhysPolA.146.70
Keywords:
magnetocaloric effect, MM'X alloys, X-ray diffraction (XRD)

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K. Kutynia
A. Przybył
P. Gębara

Abstract

The investigation of the nonmagnetic W-substitution effect on the structure and magnetocaloric properties of the MnCoGe alloy was conducted. The analysis of phase composition revealed the coexistence of a hexagonal Ni2In-type phase and an orthorhombic TiNiSi-type phase. A detailed analysis of XRD patterns supported by Rietveld analysis showed changes in the lattice constants and the content of recognized phases, which depended on the W content in the alloy. A monotonic decrease in the Curie temperature with an increase in W content in the alloy composition was noticed. The values of ΔSM measured for the variation of the external magnetic field ~5 T were equal to 5.30, 4.16, 2.32, and 3.01 for Mn0.97W0.03CoGe, Mn0.95W0.05CoGe, Mn0.93W0.07CoGe, and Mn0.9W0.1CoGe alloy, respectively. The analysis of n vs T curves recovered for the tested alloys was characteristic of second-order phase transition. 

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[1]
K. Kutynia, A. Przybył, and P. Gębara, “Structure and Magnetic Properties of the Magnetocaloric MnCoGe Modified by W”, Acta Phys. Pol. A, vol. 146, no. 1, p. 70, Jul. 2024, doi: 10.12693/APhysPolA.146.70.
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Vol. 146 No. 1 (2024): Selected papers presented at the 14th Symposium of Magnetic Measurements and Modelling SMMM'2023, pp. 1-120
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