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TbMgNi4-xCox-(H,D)2 System. II: Correlation between Structural and Magnetic Properties
Univ Paris Est Creteil, CNRS, ICMPE, UMR 7182, F-94320 Thiais, France..
Czech Acad Sci, Nucl Phys Inst, Rez 25068, Czech Republic.;European Spallat Source, ESS ERIC, SE-22100 Lund, Sweden..ORCID iD: 0000-0002-1217-3131
Czech Acad Sci, Nucl Phys Inst, Rez 25068, Czech Republic..
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström. Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Materials Science and Engineering. Univ Paris Est Creteil, CNRS, ICMPE, UMR 7182, F-94320 Thiais, France..ORCID iD: 0000-0002-8690-9957
2023 (English)In: ACS Omega, E-ISSN 2470-1343, Vol. 8, no 33, p. 30727-30735Article in journal (Refereed) Published
Abstract [en]

The magnetic properties of TbMgNi4-xCox intermetallic compounds and selected hydrides and deuterides of this system have been studied by various techniques, including magnetic measurements, in situ X-ray and neutron powder diffraction. The intermetallic compounds crystallize in a SnMgCu4-type structure and magnetically order below a Curie temperature (T-C), which increases exponentially with the Co content. This can be due to the ordering of the Co sublattice. On the other hand, the insertion of D or H in TbMgNiCo3 strongly decreases T-C. The X-ray diffraction measurements versus temperature reveal cell volume minima at T-C for the compounds with x = 1-3 without any hints of the structure change. The analysis of the neutron diffraction patterns for the intermetallics with x = 2 and 3 indicates a slightly canted ferrimagnetic structure below T-C. The Tb moments refined at 16 K are 4.1(2) (mu B)/Tb for x = 2, and 6.2(1) mu B/Tb for x = 3, which are smaller than the free ion value (9.5 mu B/Tb). This reduction can be due to the influence of temperature but also reveals the crystal field effect. As Ni and Co occupy statistically the same Wyckoff site, an average Ni/Co moment was refined, leading to 1.7(2) (mu B)/atom for x = 2 and 1.8(1) mu B/atom for x = 3 at 16 K. This moment is slightly canted compared to the Tb moment.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2023. Vol. 8, no 33, p. 30727-30735
National Category
Materials Chemistry
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URN: urn:nbn:se:uu:diva-511036DOI: 10.1021/acsomega.3c04879ISI: 001044975700001PubMedID: 37636972OAI: oai:DiVA.org:uu-511036DiVA, id: diva2:1794846
Available from: 2023-09-06 Created: 2023-09-06 Last updated: 2023-09-06Bibliographically approved

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Shtender, Vitalii

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