Low-temperature magnetothermodynamics performance of Tb.sub.1-x./sub.Er.sub.x./sub.Ni.sub.2./sub. laves-phases compounds for designing composite refrigerants

0566432 - FZÚ 2023 RIV CH eng J - Journal Article
Ćwik, J. - Koshkid'ko, Y. - Nenkov, K. - Tereshina-Chitrova, Evgenia - Weise, B. - Kowalska, K.
Low-temperature magnetothermodynamics performance of Tb_1-xEr_xNi₂ laves-phases compounds for designing composite refrigerants.
Crystals. Roč. 12, č. 7 (2022), č. článku 931. ISSN 2073-4352. E-ISSN 2073-4352
Institutional support: RVO:68378271
Keywords : intermetallic compounds * laves phase * magnetic entropy change * magnetic materials * magnetocaloric effect * phase transition
OECD category: Condensed matter physics (including formerly solid state physics, supercond.)
Impact factor: 2.7, year: 2022
Method of publishing: Open access

Heat capacity measurements are performed on the polycrystalline Tb1-xErxNi2 intermetallic compounds with x = 0.25, 0.5 and 0.75. The Debye temperatures and lattice contributions as well as the magnetic part of the heat capacity were determined and analyzed. We find that the substitution of Tb atoms for Er atoms leads to a linear reduction of the Curie temperatures from 28.3 K in Tb0.25Er0.75Ni2 to 12.9 K in Tb0.75Er0.25Ni2. We calculate with good approximation the isothermal magnetic entropy ∆Smag and adiabatic temperature changes ∆Tad for Tb1-xErxNi2, for the magnetic field value equal to 1 T and 2 T. The optimal molar ratios of individual Tb0.75Er0.25Ni2, Tb0.5Er0.5Ni2 and Tb0.25Er0.75Ni2 components in the final composite were theoretically determined. According to the obtained results, the investigated composites make promising candidates that can find their application as an active body in a magnetic refrigerator performing an Ericsson cycle at low temperatures.
Permanent Link: https://hdl.handle.net/11104/0337756