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Magnetic transitions with magnetocaloric effects near room temperature related to structural transitions in Y0.9Pr0.1Fe2D3.5 deuteride
Univ Paris Est Creteil, ICMPE UMR7182, CNRS, 2 Rue Henri Dunant, F-94320 Thiais, France..
Univ Paris Est Creteil, ICMPE UMR7182, CNRS, 2 Rue Henri Dunant, F-94320 Thiais, France.;Univ Basque Country, UPV EHU, Dept Fis Aplicada 1, Escuela Ingn Bilbao, Plaza Torres Quevedo 1, Bilbao 48013, Spain..
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Kemiska sektionen, Institutionen för kemi - Ångström, Oorganisk kemi. Univ Paris Est Creteil, ICMPE UMR7182, CNRS, 2 Rue Henri Dunant, F-94320 Thiais, France.ORCID-id: 0000-0002-8690-9957
Univ Paris Est Creteil, ICMPE UMR7182, CNRS, 2 Rue Henri Dunant, F-94320 Thiais, France..
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2021 (Engelska)Ingår i: Journal of Applied Physics, ISSN 0021-8979, E-ISSN 1089-7550, Vol. 130, nr 11, artikel-id 113904Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The structural and magnetic properties of Y0.9Pr0.1Fe2D3.5 deuteride have been investigated by synchrotron and neutron diffraction, magnetic measurements, and differential scanning calorimetry. Deuterium insertion induces a 23.5% cell volume increase and a lowering of crystal symmetry compared to the cubic C15 Y0.9Pr0.1Fe2 parent compound (Fd-3m SG). The deuteride is monoclinic (P2(1)/c SG) below 330 K and undergoes a first-order transition between 330 and 350 K toward a pseudo-cubic structure (R-3 m SG) with TO-D = 342(2) K. In both structures, the D atoms are located in 96% R2Fe2 and 4% RFe3 tetrahedral interstitial sites (R = Y0.9Pr0.1). The compound is ferromagnetic, accompanied by a magnetostrictive effect below T-C = 274 K. The analysis of the critical exponents indicates a second-order type transition with a deviation from the isotropic 3D Heisenberg model toward the 3D XY model. This implies an easy plane of magnetization in agreement with cell parameter variation showing planar magnetic orientation. A weak magnetic peak is even observed at the order-disorder transition with a maximum at 343 K. Magnetic entropy variations are characteristic of direct and inverse magnetocaloric effects at T-C and TO-D, respectively.

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AIP Publishing American Institute of Physics (AIP), 2021. Vol. 130, nr 11, artikel-id 113904
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URN: urn:nbn:se:uu:diva-456829DOI: 10.1063/5.0061200ISI: 000697564000004OAI: oai:DiVA.org:uu-456829DiVA, id: diva2:1607372
Tillgänglig från: 2021-11-01 Skapad: 2021-11-01 Senast uppdaterad: 2024-01-15Bibliografiskt granskad

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