The ternary gallide CeNiGa: polymorphism and hydrogen absorption
| 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 | BOBET, Jean-Louis | |
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | GAUDIN, Etienne | |
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | PASTUREL, Mathieu | |
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | ETOURNEAU, Jean | |
| dc.date.issued | 2002 | |
| dc.identifier.issn | 0022-4596 | |
| dc.description.abstractEn | The ternary gallide CeNiGa presents a crystallographic transformation with temperature. The crystal structure of the high-temperature form (HTF), determined for the first time by X-ray diffraction on a single crystal, is orthorhombic TiNiSi-type, whereas the low-temperature form (LTF) adopts the hexagonal ZrNiAl-type. Electrical resistivity and magnetization measurements reveal that both (LTF) and (HTF) CeNiGa are classified as intermediate valence compounds, but their Kondo temperatures TK are strongly different; TK⪢300 K and TK≅95(5) K for (LTF) and (HTF), respectively. Both forms react with hydrogen at room temperature and form the hydride CeNiGaH1.1(1) which crystallizes in the hexagonal AlB2-type with lattice parameters a=4.239(4) Å and c=4.258(5) Å. Hydrogenation also induces a valence transition for cerium from the intermediate valence state (CeNiGa) to a purely trivalent state (CeNiGaH1.1(1)). This behavior is correlated to an increase of the unit cell volume after hydrogenation and is compared to that observed previously for CeNiAlH1.93. | |
| dc.language.iso | en | |
| dc.publisher | Elsevier | |
| dc.subject.en | Cerium compounds | |
| dc.subject.en | X-ray diffraction | |
| dc.subject.en | Intermediate valence | |
| dc.subject.en | Hydrogenation | |
| dc.subject.en | Magnetism | |
| dc.title.en | The ternary gallide CeNiGa: polymorphism and hydrogen absorption | |
| dc.type | Article de revue | |
| dc.identifier.doi | 10.1006/jssc.2002.9671 | |
| dc.subject.hal | Chimie/Matériaux | |
| bordeaux.journal | Journal of Solid State Chemistry | |
| bordeaux.page | 28-33 | |
| bordeaux.volume | 168 | |
| bordeaux.issue | 1 | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-00817138 | |
| hal.version | 1 | |
| hal.popular | non | |
| hal.audience | Internationale | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-00817138v1 | |
| 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=2002&rft.volume=168&rft.issue=1&rft.spage=28-33&rft.epage=28-33&rft.eissn=0022-4596&rft.issn=0022-4596&rft.au=CHEVALIER,%20Bernard&BOBET,%20Jean-Louis&GAUDIN,%20Etienne&PASTUREL,%20Mathieu&ETOURNEAU,%20Jean&rft.genre=article |
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