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Near room temperature magnetocaloric effect of Cr1−xRuxO2 (x = 0.000, 0.125, and 0.250) for magnetic refrigeration

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Abstract

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 \((\mu_{{{\text{eff}}}}^{\exp } )\). 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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Authors and Affiliations

  1. LPMAT, Faculty of Sciences Ain Chock, Hassan II University of Casablanca, Mâarif, BP 5366, Casablanca, Morocco

    A. Elouafi, S. El Ouahbi, S. Ezairi & H. Lassri

  2. LMPGI, Université Hassan II de Casablanca, Ecole Supérieure de Technologie (ESTC), Oasis, BP 8012, Casablanca, Morocco

    A. Elouafi, S. Ezairi & A. Tizliouine

  3. IAP-EMINES, Mohammed VI Polytechnic University, Lot 660, Hay Moulay Rachid Ben Guerir, 43150, Ben Guerir, Morocco

    M. Lassri

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All authors contributed to the study conception and design. All authors read and approved the final manuscript.

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Correspondence to S. El Ouahbi.

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Elouafi, A., El Ouahbi, S., Ezairi, S. et al. Near room temperature magnetocaloric effect of Cr1−xRuxO2 (x = 0.000, 0.125, and 0.250) for magnetic refrigeration. Eur. Phys. J. Plus 138, 22 (2023). https://doi.org/10.1140/epjp/s13360-022-03646-y

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