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Transition from antiferromagnetic ordering to cluster-glass behaviour in the solid solution Gd<sub>4</sub>NiMg<sub>1−<i>x</i></sub>Al<i><sub>x</sub></i> (0 ≤ <i>x</i> ≤ 0.9)

hal.structure.identifierInstitut für Anorganische und Analytische Chemie
dc.contributor.authorLINSINGER, Stefan
hal.structure.identifierInstitut für Anorganische und Analytische Chemie
dc.contributor.authorHERMES, Wilfried
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorCHEVALIER, Bernard
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorCOUILLAUD, Samuel
hal.structure.identifierInstitut de Chimie de la Matière Condensée de Bordeaux [ICMCB]
dc.contributor.authorBOBET, Jean-Louis
hal.structure.identifierInstitut für Anorganische und Analytische Chemie
dc.contributor.authorEUL, Matthias
hal.structure.identifierInstitut für Anorganische und Analytische Chemie
dc.contributor.authorPÖTTGEN, Rainer
dc.date.issued2009
dc.identifier.issn0966-9795
dc.description.abstractEnVarious samples of the solid solution Gd<sub>4</sub>NiMg<sub>1−<i>x</i></sub>Al<i><sub>x</sub></i> were synthesized from the elements in sealed tantalum ampoules in an induction furnace. These gadolinium-rich compounds crystallize with the cubic Gd<sub>4</sub>RhIn type structure, space group the F4-; 3m. All samples were characterized on the basis of Guinier powder patterns. The lattice parameter decreases with increasing aluminium content in a <i>Vegard</i>-like manner. The structures of two crystals were refined on the basis of diffractometer data: <i>a</i> = 1359.3(1), w<i>R</i>2 = 0.0711, 481 <i>F</i><sup>2</sup> values, 20 variables for Gd<sub>4</sub>NiMg<sub>0.52(1)</sub>Al<sub>0.48(1)</sub> and <i>a</i> = 1351.40(6), w<i>R</i>2 = 0.0665, 478 <i>F</i><sup>2</sup> values, 21 variables for Gd<sub>4</sub>NiMg<sub>0.10(1)</sub>Al<sub>0.90(1)</sub>. The main structural motif is a rigid three-dimensional network of edge- and corner-sharing Gd<sub>6</sub>Ni trigonal prisms and isolated (Mg/Al)<sub>4</sub> tetrahedra in fcc packing. The edge length of the tetrahedra drastically decreases from Gd<sub>4</sub>NiMg (309 pm) to Gd<sub>4</sub>NiMg<sub>0.10(1)</sub>Al<sub>0.90(1)</sub> (294 pm). The Gd<sub>4</sub>NiMg<sub>1−<i>x</i></sub>Al<i><sub>x</sub></i> samples show Curie–Weiss behaviour with slightly higher magnetic moment values than the theoretical one for a free Gd<sup>3+</sup> ion. By substitution of Gd<sub>4</sub>NiMg with aluminium the cell volume decreases and the atomic disorder (Mg/Al) induces a random distribution of the magnetic interactions. This leads to a shift of the Néel temperatures to lower values when increasing the aluminium content. Already for Gd<sub>4</sub>NiMg<sub>0.4</sub>Al<sub>0.6</sub> the long-range antiferromagnetic ordering no longer exists and the system comes into a cluster-glass state.
dc.language.isoen
dc.publisherElsevier
dc.title.enTransition from antiferromagnetic ordering to cluster-glass behaviour in the solid solution Gd<sub>4</sub>NiMg<sub>1−<i>x</i></sub>Al<i><sub>x</sub></i> (0 ≤ <i>x</i> ≤ 0.9)
dc.typeArticle de revue
dc.identifier.doi10.1016/j.intermet.2009.05.005
dc.subject.halChimie/Matériaux
bordeaux.journalIntermetallics
bordeaux.page1028-1034
bordeaux.volume17
bordeaux.issue12
bordeaux.peerReviewedoui
hal.identifierhal-00420656
hal.version1
hal.popularnon
hal.audienceInternationale
dc.subject.itIntermetallics
dc.subject.itMiscellaneous
dc.subject.itCrystal chemistry
dc.subject.itMagnetic properties
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00420656v1
bordeaux.COinSctx_ver=Z39.88-2004&amp;rft_val_fmt=info:ofi/fmt:kev:mtx:journal&amp;rft.jtitle=Intermetallics&amp;rft.date=2009&amp;rft.volume=17&amp;rft.issue=12&amp;rft.spage=1028-1034&amp;rft.epage=1028-1034&amp;rft.eissn=0966-9795&amp;rft.issn=0966-9795&amp;rft.au=LINSINGER,%20Stefan&amp;HERMES,%20Wilfried&amp;CHEVALIER,%20Bernard&amp;COUILLAUD,%20Samuel&amp;BOBET,%20Jean-Louis&amp;rft.genre=article


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