Influence of Interstitial and Substitutional Atoms on Magnetocaloric Effects in RNi Compounds

Chzhan, V.B.; Kurganskaya, A.A.; Tereshina, I.S.; Karpenkov, A.Y.; Ovchenkova, I.A.; Tereshina-Chitrova, E.A.; Andreev, A.V.; Gorbunov, D.I.; Lushnikov, S.A.; Verbetsky, V.N.

Авторы: Chzhan V.B., Kurganskaya A.A., Tereshina I.S., Karpenkov A.Yu, Ovchenkova I.A., Tereshina-Chitrova E.A., Andreev A.V., Gorbunov D.I., Lushnikov S.A., Verbetsky V.N.
Журнал: Materials Chemistry and Physics
Том: 264
Год издания: 2021
Издательство: Elsevier BV
Местоположение издательства: Netherlands
Номер статьи: 124455
DOI: 10.1016/j.matchemphys.2021.124455
Аннотация: The effects of substitutional and interstitial atoms on the magnetic and magnetocaloric properties are investigated for RNi (R is rare earth) compounds attractive for magnetic solid-state cooling at cryogenic temperatures. We focused on combining weakly and highly anisotropic rare earth compounds and obtained GdxDy1-xNi (x = 0.1 and 0.9) compounds and their GdxDy1-xNiH3 hydrides. We observed a considerable decrease in Curie temperatures (TC) in the hydrides GdxDy1-xNiH3 compared to their parent alloys. The magnetocaloric effect (MCE) values of GdxDy1-xNiHy (y = 0 and 3) in the vicinity of TC were obtained and compared with literature data for the final GdNi and DyNi compounds. The maximum specific isothermal entropy changes -ΔsT at μ0ΔH = 5 T were 14.5, 17, and 17.5 J kg−1K−1 for GdNi, Gd0.9Dy0.1Ni, and Gd0.9Dy0.1NiH3, respectively. For DyNi, Gd0.1Dy0.9Ni, and Gd0.1Dy0.9NiH3, they were -ΔsT = 18, 15.5, and 12.5 J kg−1K−1 at μ0ΔH = 5 T, respectively. -ΔsT(H) in Gd0.9Dy0.1NiH3 at T = TC linearly increased in fields up to 7 T, while Gd0.1Dy0.9NiH3 at T ≥ TC showed a plateau-like magnetocaloric effect at μ0ΔH = 5 and 7 T. The observed effects were explained based on altered exchange and magnetocrystalline interactions in the modified compounds.
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Influence of Interstitial and Substitutional Atoms on Magnetocaloric Effects in RNi Compoundsстатья

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