Berlin 2018 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 52: Poster II
MA 52.32: Poster
Donnerstag, 15. März 2018, 15:00–18:00, Poster C
Magnetic properties of the FexNi8−xSi3 materials, 0≤ x ≤8 — •Mohammed Ait Haddouch1, Simone Gallus2, Jörg Perßon1, Jörg Voigt1, Karen Friese1, and Andrzej Grzechnik2 — 1Jülich Centre for Neutron Science-2/Peter Grünberg Institut-4, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany — 2Institute of Crystallography, RWTH Aachen University, Jägerstr. 17-19, 52066 Aachen, Germany
In this work, the magnetic properties of the system FexNi8−xSi3 with 0≤ x ≤8 were investigated by DC magnetization measurements for 1≤ x ≤6 in the temperature range from 10 K to 900 K. The system features a large number of different crystallographic sites for the magnetic ions, which is a possible ingredient for good magnetocaloric materials. Within the ternary FexNi8−xSi3 system, two different stability fields have been observed [1]. For the Ni31Si12 structure types samples with 0≤ x ≤4 we find magnetic transitions below 380 K evidenced by sudden changes in the slope of the M(T) curves. Even above these temperatures, the samples do not exhibit Curie-Weiss behavior, indicating the existence of another magnetically ordered phase. For 5≤ x ≤8 samples with the Fe3Si structure type with compositions exhibit only one phase transition around 800 K. On the basis of our data, a magnetic phase diagram will be proposed over the full range of FexNi8−xSi3 compositions between 0 K and 900 K. We will also derive the magnetic entropy change for the different magnetic transitions of these compound, to check their magnetocaloric effect efficiency.
[1] Gallus et.al, submitted to Solid State Sciences, (2017)