Structure and Magnetic Properties of the Magnetocaloric MnCoGe Modified by W |
| K. Kutynia, A. Przybył, P. Gębara
Department of Physics, Częstochowa University of Technology, Armii Krajowej 19, 42-200 Częstochowa, Poland |
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| 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. |
DOI:10.12693/APhysPolA.146.70 topics: magnetocaloric effect, MM'X alloys, X-ray diffraction (XRD) |