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Impact of the R and Mg on the structural, hydrogenation and magnetic properties of R3-xMgxCo9 (R = Pr, Nd, Tb and Y) compounds
Uppsala University, Disciplinary Domain of Science and Technology, Chemistry, Department of Chemistry - Ångström, Inorganic Chemistry. Univ Paris Est, ICMPE UMR7182, CNRS, UPEC, F-94320 Thiais, France.;NAS Ukraine, Karpenko Phys Mech Inst, 5 Naukova St, UA-79060 Lvov, Ukraine..ORCID iD: 0000-0002-8690-9957
Univ Paris Est, ICMPE UMR7182, CNRS, UPEC, F-94320 Thiais, France..
HYSTORSYS AS, Box 45, NO-2027 Kjeller, Norway..
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Materials Science and Engineering, Solid State Physics.ORCID iD: 0000-0003-3574-2146
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2022 (English)In: Materials research bulletin, ISSN 0025-5408, E-ISSN 1873-4227, Vol. 156, article id 111981Article in journal (Refereed) Published
Abstract [en]

R2MgCo9 (R = Pr, Nd, Tb and Y) compounds have been synthesized by a powder sintering method and the corresponding hydrides have been prepared by a solid gas method. Their crystal structures and magnetic properties have been systematically studied. X-ray diffraction analysis showed that all R2MgCo9 compounds belong to the PuNi3-type structure. The elements Tb, Y, Nd, Pr yield a lowering of the equilibrium pressure which correlates well with the increase in cell volume. The R2MgCo9H(D)x (R = Pr, Nd, Tb and Y; (9.4 <= x <= 12)) hydrides (deuterides) preserve the PuNi3-type structure with hydrogenation-induced volume expansion ranging from 14.7 to 19.6%. The substitution of deuterium for hydrogen in R2MgCo9-(H,D)(2) (R = Tb and Y) prevents fast desorption at room temperature and ambient pressure. As for the magnetic properties, all the studied interme-tallic compounds show ferromagnetic or ferrimagnetic behavior, and in some cases a temperature dependent spin reorientation. Hydrogen insertion reduces the magnetization and decreases the magnetic ordering temperature (TC), whereas Mg for R substitution increases TC.

Place, publisher, year, edition, pages
Elsevier BV Elsevier, 2022. Vol. 156, article id 111981
Keywords [en]
Rare e arth compounds, Magnesium compounds, Metal hydrides, Crystal structures, Magnetic properties
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-483854DOI: 10.1016/j.materresbull.2022.111981ISI: 000843629300005OAI: oai:DiVA.org:uu-483854DiVA, id: diva2:1693093
Available from: 2022-09-05 Created: 2022-09-05 Last updated: 2024-01-15Bibliographically approved

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Shtender, VitaliiHedlund, DanielSvedlindh, Peter

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