Rare earth metal rich magnesium compounds <i>RE</i><sub>4</sub>NiMg (<i>RE</i>=Y, Pr–Nd, Sm, Gd–Tm, Lu)—Synthesis, structure, and hydrogenation behavior
| hal.structure.identifier | Institut für Anorganische und Analytische Chemie | |
| dc.contributor.author | TUNCEL, Selcan | |
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | ROQUEFERE, Jean-Gabriel | |
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | PETRACHE STAN, Cristina Iuliana | |
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | BOBET, Jean-Louis | |
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | CHEVALIER, Bernard | |
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | GAUDIN, Etienne | |
| hal.structure.identifier | Institut für Anorganische Chemie | |
| dc.contributor.author | HOFFMANN, Rolf-Dieter | |
| hal.structure.identifier | Institut für Anorganische und Analytische Chemie | |
| dc.contributor.author | RODEWALD, Ute Ch. | |
| hal.structure.identifier | Institut für Anorganische und Analytische Chemie | |
| dc.contributor.author | PÖTTGEN, Rainer | |
| dc.date.issued | 2009 | |
| dc.identifier.issn | 0022-4596 | |
| dc.description.abstractEn | The rare earth metal rich compounds <i>RE</i><sub>4</sub>NiMg (<i>RE</i>=Y, Pr–Nd, Sm, Gd–Tm, Lu) were synthesized from the elements in sealed tantalum tubes in an induction furnace. All compounds were investigated by X-ray diffraction on powders and single crystals: Gd<sub>4</sub>RhIn type, space group <i>F</i>4¯3<i>m</i>, <i>Z</i>=16, <i>a</i>=1367.6(2) pm for Y<sub>4</sub>NiMg, <i>a</i>=1403.7(3) pm for Pr<sub>4</sub>NiMg, <i>a</i>=1400.7(1) pm for Nd<sub>4</sub>NiMg, <i>a</i>=1386.5(2) pm for Sm<sub>4</sub>NiMg, <i>a</i>=1376.1(2) pm for Gd<sub>4</sub>NiMg, <i>a</i>=1362.1(1) pm for Tb<sub>4</sub>NiMg, <i>a</i>=1355.1(2) pm for Dy<sub>4</sub>NiMg, <i>a</i>=1355.2(1) pm for Ho<sub>4</sub>NiMg, <i>a</i>=1354.3(2) pm for Er<sub>4</sub>NiMg, <i>a</i>=1342.9(3) pm for Tm<sub>4</sub>NiMg, and <i>a</i>=1336.7(3) pm for Lu<sub>4</sub>NiMg. The nickel atoms have trigonal prismatic rare earth coordination. These Ni<i>RE</i><sub>6</sub> prisms are condensed via common edges to a three-dimensional network which leaves voids for Mg<sub>4</sub> tetrahedra and the <i>RE</i>1 atoms which show only weak coordination to the nickel atoms. The single crystal data indicate two kinds of solid solutions. The <i>RE</i>1 positions reveal small <i>RE</i>1/Mg mixing and some compounds also show Ni/Mg mixing within the Mg<sub>4</sub> tetrahedra. Y<sub>4</sub>NiMg and Gd<sub>4</sub>NiMg have been tested for hydrogenation. These compounds absorb up to eleven hydrogen atoms per formula unit under a hydrogen pressure of 1 MPa at room temperature. The structure of the metal atoms is maintained with only an increase of the lattice parameters (Δ<i>V</i>/<i>V</i>≈22%) if the absorption is done at <i>T</i><363 K as at higher temperature a decomposition into <i>RE</i>H<sub>2</sub>–<i>RE</i>H<sub>3</sub> hydrides occurred. Moreover, the hydrogenation affects drastically the magnetic properties of these intermetallics. For instance, Gd<sub>4</sub>NiMg exhibits an antiferromagnetic behavior below <i>T<sub>N</sub></i>=92 K whereas its hydride Gd<sub>4</sub>NiMgH<sub>11</sub> is paramagnetic down to 1.8 K. | |
| dc.language.iso | en | |
| dc.publisher | Elsevier | |
| dc.subject.en | Magnesium | |
| dc.subject.en | Intermetallics Crystal chemistry | |
| dc.subject.en | Hydrogenation | |
| dc.title.en | Rare earth metal rich magnesium compounds <i>RE</i><sub>4</sub>NiMg (<i>RE</i>=Y, Pr–Nd, Sm, Gd–Tm, Lu)—Synthesis, structure, and hydrogenation behavior | |
| dc.type | Article de revue | |
| dc.identifier.doi | 10.1016/j.jssc.2008.10.026 | |
| dc.subject.hal | Chimie/Matériaux | |
| bordeaux.journal | Journal of Solid State Chemistry | |
| bordeaux.page | 229-235 | |
| bordeaux.volume | 182 | |
| bordeaux.issue | 2 | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-00359221 | |
| hal.version | 1 | |
| hal.popular | non | |
| hal.audience | Internationale | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-00359221v1 | |
| bordeaux.COinS | ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Journal%20of%20Solid%20State%20Chemistry&rft.date=2009&rft.volume=182&rft.issue=2&rft.spage=229-235&rft.epage=229-235&rft.eissn=0022-4596&rft.issn=0022-4596&rft.au=TUNCEL,%20Selcan&ROQUEFERE,%20Jean-Gabriel&PETRACHE%20STAN,%20Cristina%20Iuliana&BOBET,%20Jean-Louis&CHEVALIER,%20Bernard&rft.genre=article |
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