Journal of Alloys and Compounds, volume 886, pages 161295
Magnetocaloric prospects of mutual substitutions of rare-earth elements in pseudobinary Tb1−xHoxNi2 compositions (x = 0.25–0.75)
1
Institute of Low Temperature and Structure Research, PAS, Okólna 2, 50-422 Wrocław, Poland
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Publication type: Journal Article
Publication date: 2021-12-01
Journal:
Journal of Alloys and Compounds
Quartile SCImago
Q1
Quartile WOS
Q1
Impact factor: 6.2
ISSN: 09258388
Materials Chemistry
Metals and Alloys
Mechanical Engineering
Mechanics of Materials
Abstract
As the magnetocaloric characterization of polycrystalline Tb 1−x Ho x Ni 2 intermetallic compounds (with x = 0.25, 0.5, and 0.75), their relative cooling power (RCP) and refrigerant capacity (RC) are estimated based on comprehensive investigations of the magnetic and thermodynamic properties of the compositions, the structure of which was studied in detail by x-ray diffraction analysis and scanning electron microscopy. The taken x-ray diffraction patterns demonstrate the similarity between the Ho-depleted compound (x = 0.25) and the parent TbNi 2 and HoNi 2 compounds, i.e., the regular C15 cubic structure forms in them, whereas, in the case of x = 0.5 and 0.75, the C15-based superstructure is found. Both magnetic and heat capacity measurements showed that all of the studied compounds exhibit the transition from the ferromagnetic to paramagnetic state, which is confirmed to be the second order magnetic phase transition with the Curie temperature that decreases from 31.1 to 18.6 K in passing from the Tb-enriched Tb 0.75 Ho 0.25 Ni 2 to the Ho-enriched Tb 0.25 Ho 0.75 Ni 2 composition. The high values of RCP and RC are shown can be reached for the compositions and experimentally are demonstrated based on the performed measurements of magnetic and thermodynamic parameters. Under an external magnetic field change of 0–5 T, the maximum magnetic entropy change -Δ S mag for the Tb 1−x Ho x Ni 2 compounds increases from 13.9 to 19.5 J/kgK as x increases from 0.25 to 0.75. These experimental results are compared with and confirmed by available theoretical data. The maximum adiabatic temperature change Δ T ad for Tb 0.75 Ho 0.25 Ni 2 and Tb 0.5 Ho 0.5 Ni 2 at the 2 T magnetic field change reaches 3.0 K, and substantially increases, namely, to 4.5 K in the case of the Tb 0.25 Ho 0.75 Ni 2 composition near its Curie temperature T C . The effect of increasing Ho content in the Laves-phase compounds on their magnetic and magnetocaloric properties is discussed. • The comprehensive characterization of the magnetocaloric properties and their thermodynamic origin was performed. • The Curie temperature decreases linearly from 31.1 K for Tb 0.75 Ho 0.25 Ni 2 to 18.6 K for Tb 0.25 Ho 0.75 Ni 2 . • All compounds under study exhibit the second order magnetic phase transition. • The mean-field theory is valid for the studied Tb 1‑x Ho x Ni 2 quasibinary compounds. • The potential candidate material for magnetic refrigeration applications.
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Ćwik J. et al. Magnetocaloric prospects of mutual substitutions of rare-earth elements in pseudobinary Tb1−xHoxNi2 compositions (x = 0.25–0.75) // Journal of Alloys and Compounds. 2021. Vol. 886. p. 161295.
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Ćwik J., Koshkid'ko Yu. S., Malecka M., Weise B., Krautz M., Mikhailova A., Kolchugina N. Magnetocaloric prospects of mutual substitutions of rare-earth elements in pseudobinary Tb1−xHoxNi2 compositions (x = 0.25–0.75) // Journal of Alloys and Compounds. 2021. Vol. 886. p. 161295.
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TY - JOUR
DO - 10.1016/j.jallcom.2021.161295
UR - https://doi.org/10.1016%2Fj.jallcom.2021.161295
TI - Magnetocaloric prospects of mutual substitutions of rare-earth elements in pseudobinary Tb1−xHoxNi2 compositions (x = 0.25–0.75)
T2 - Journal of Alloys and Compounds
AU - Ćwik, J.
AU - Koshkid'ko, Yu S.
AU - Malecka, Magdalena
AU - Weise, B.
AU - Krautz, M.
AU - Mikhailova, A.
AU - Kolchugina, Natalia
PY - 2021
DA - 2021/12/01 00:00:00
PB - Elsevier
SP - 161295
VL - 886
SN - 0925-8388
ER -
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@article{2021_Ćwik,
author = {J. Ćwik and Yu S. Koshkid'ko and Magdalena Malecka and B. Weise and M. Krautz and A. Mikhailova and Natalia Kolchugina},
title = {Magnetocaloric prospects of mutual substitutions of rare-earth elements in pseudobinary Tb1−xHoxNi2 compositions (x = 0.25–0.75)},
journal = {Journal of Alloys and Compounds},
year = {2021},
volume = {886},
publisher = {Elsevier},
month = {dec},
url = {https://doi.org/10.1016%2Fj.jallcom.2021.161295},
pages = {161295},
doi = {10.1016/j.jallcom.2021.161295}
}
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