Abstract
Multicomponent rare earth intermetallic compounds Tb0.33Ho0.33Er0.33Ni and Dy0.33Ho0.33Er0.33Ni crystallize in orthorhombic FeB-type structure (Space group Pnma, No. 62, oP8) and order ferromagnetically at 59 K and 40 K (TC) respectively. Hydrides of these samples show a presence of ~ 10-nm size nanoparticles with unit cell volume expansion. Magnetization measurements reveal that hydrides Tb0.33Ho0.33Er0.33NiH1.9 and Dy0.33Ho0.33Er0.33NiH1.9 remain paramagnetic from 300 K down to 5 K. Magnetization value at 5 K in 70 kOe field is ~ 5.1 µB/f.u. and 5.5 µB/f.u., respectively, for Tb0.33Ho0.33Er0.33NiH1.9 and Dy0.33Ho0.33Er0.33NiH1.9 samples. Despite the lack of ferromagnetic order, hydrides exhibit large low-temperature magnetocaloric effect with maximum isothermal magnetic entropy change values of about − 11.6 Jkg−1 K−1 at 14 K and – 12.9 Jkg−1 K−1 at 8 K respectively for 50 kOe magnetic field change.
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Author A. P. M. thanks UGC for the fellowship.
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R. N. thanks the Science and Engineering Research Board (SERB), New Delhi, for support under grant number CRG/2022/007828.
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R. N., J. A. C. and S. R. P. contributed to conception and design of the work. A. P. M., D. A. R. and A. V. M. have done data acquisition and/or data analysis. All authors drafted the work and contributed equally to writing and reviewing the manuscript.
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Mohapatra, A.P., A. R., D., Chelvane, J.A. et al. Effect of Hydrogenation on the Magnetic and Magnetocaloric Properties of Rare Earth Intermetallic Compounds Tb0.33Ho0.33Er0.33Ni and Dy0.33Ho0.33Er0.33Ni. J Supercond Nov Magn (2024). https://doi.org/10.1007/s10948-024-06747-0
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DOI: https://doi.org/10.1007/s10948-024-06747-0