Magnetocaloric and Mössbauer effects studies of the multicomponent Tb-Dy-Ho-Co-Fe-H compounds with a Laves phase structure near the Curie temperature

•Main regularities of the change in MCE value with a change in composition are found.•We find a structural phase transition in Тb0.4Dy0.3Ho0.3Co1.75Fe0.25 at 375 K using XRD.•Mössbauer effect study provided data on the hyperfine parameters in the alloys.•Hydrogenation effect on magnetism of alloys i...

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Bibliographic Details
Published in:Journal of alloys and compounds 2021-07, Vol.868, p.159056, Article 159056
Main Authors: Chzhan, V.B., Tereshina, I.S., Rusakov, V.S., Kurganskaya, A.A., Tereshina-Chitrova, E.A., Filimonov, A.V., Tran, V.H., Karpenkov, A.Yu, Drulis, H.
Format: Article
Language:English
Subjects:
Cobalt base alloys
Cooling systems
Coordination compounds
Crystal structure
Curie temperature
Dysprosium base alloys
High temperature
Intermetallic compound
Iron
Iron 57
Laves phase
Magnetic properties
Magnetism
Magnetocaloric effect
Metal compounds
Mossbauer effect
Mössbauer effect
Rare earth elements
Room temperature
Solid phases
Temperature
Terbium
Transition metal compounds
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Summary:•Main regularities of the change in MCE value with a change in composition are found.•We find a structural phase transition in Тb0.4Dy0.3Ho0.3Co1.75Fe0.25 at 375 K using XRD.•Mössbauer effect study provided data on the hyperfine parameters in the alloys.•Hydrogenation effect on magnetism of alloys is shown. In this work, the effects of substitutional elements on the magnetism of complex rare-earth-transition metal compounds RT2 with the Laves phase structure are studied with the aim to find new materials with high magnetocaloric effect (MCE) above room temperature. We determine the main regularities in the MCE magnitude variation when varying composition of the Tb-Dy-Ho-Co-Fe alloys and also after hydrogenation. The crystal structure of the compounds is characterized by X-ray diffraction in a wide temperature range while information on the magnetic properties of the 3d-transition metal sublattice is accessed by means of the 57Fe Mössbauer effect studies. We design a series of Tbx(Dy0.5Ho0.5)1-xCo1.75Fe0.25 samples with constant MCE values, suitable for the use as cooling elements of devices operating at elevated temperatures.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2021.159056