https://doi.org/10.1140/epjp/s13360-022-03646-y
Regular Article
Near room temperature magnetocaloric effect of Cr1−xRuxO2 (x = 0.000, 0.125, and 0.250) for magnetic refrigeration
1
LPMAT, Faculty of Sciences Ain Chock, Hassan II University of Casablanca, BP 5366, Mâarif, Casablanca, Morocco
2
LMPGI, Université Hassan II de Casablanca, Ecole Supérieure de Technologie (ESTC), BP 8012, Oasis, Casablanca, Morocco
3
IAP-EMINES, Mohammed VI Polytechnic University, Lot 660, Hay Moulay Rachid Ben Guerir, 43150, Ben Guerir, Morocco
Received:
7
June
2022
Accepted:
30
December
2022
Published online:
13
January
2023
In this scientific paper, we thoroughly investigated the magnetocaloric effect of Cr1−xRuxO2 (x = 0.000, 0.125, and 0.250) nanoparticles near room temperature. X-ray diffraction (XRD) is used to analyse the structure results. The magnetization versus temperature curves display a second-order magnetic phase transition from ferromagnetic (FM) to paramagnetic (PM) at 390, 302, and 286 K for x = 0.000, 0.125, and 0.250, respectively. The substitution of Cr by Ru leads to a decrease in TC from 390 to 286 K with an increasing concentration of ruthenium from 0.000 to 0.250. From the Curie–Weiss (CW) law, we have extracted the CW temperature (θP) and the experimental effective magnetic moment 
. In addition, these nanoparticles exhibit a large magnetic entropy change, which is advantageous to improve the relative cooling power (RCP). Under a magnetic field of 1.5 T, the RCP of Cr0.875Ru0.125O2 nanoparticles is found to be 324.35 J kg−1 at TC = 302 K which is superior to pure Gd at TC = 293 K. From heat capacity measurements, the adiabatic temperature change (ΔTad) is found to be 2.1 K for a magnetic field of 1.5 T. Consequently, a large magnetocaloric effect was observed in magnetic oxides. These magnetic oxide nanoparticles can be subject to magnetocaloric effect studies around the room temperature.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2023. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
