Journal of Magnetism and Magnetic Materials
In this work, we report the magnetic dilution effect on the magnetic and magnetocaloric properties of (Gd1-xYx)(2)NiSi3 (x = 0.25, 0.5, 0.75) compounds by partial substitution of Y ions in Gd2NiSi3. The X-ray diffraction studies indicate all theses compounds form in AlB2 type hexagonal crystal structure. The dc magnetic measurements reveal the compounds undergo antiferromagnetic like phase transition below 11.5, 7.2, and 3.1 K for x = 0.25, 0.5 and 0.75 compositions, respectively. The magnetic ground state of the compounds becoming increasingly fragile with the increase in Y concentration, and results in magnetic field induced ferromagnetic transition. Such change in magnetic spin configuration is responsible for moderately large magnetic entropy change (Delta S-M (similar to)19.3 J/kg-K, 14.8 J/kg-K and 9.8 J/kg-K for x = 0.25, 0.5, and 0.75, respectively, for Delta H = 7T) in the cryogenic temperature region. The relative cooling power (RCP) has also been estimated for all the compounds that appears to be modest ((similar to)503 J/kg for 7T magnetic field change) for x = 0.25 analogue and reduces further with magnetic dilution effect caused by Y substitution.
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