Study of Mg2Ni1−xFex alloys by Mössbauer resonance
| hal.structure.identifier | Division of Advanced Materials Engineering, Research Center of Advanced Materials Development | |
| dc.contributor.author | SONG, Myoung-Youp | |
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | FOURNÈS, Léopold | |
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | DARRIET, Bernard | |
| dc.date.issued | 2003 | |
| dc.identifier.issn | 0360-3199 | |
| dc.description.abstractEn | After preparing Mg2Ni1−xFex (x=0.005, 0.01, 0.02 and 0.08) alloys, they were studied by Mössbauer resonance. The Mössbauer spectra of x=0.005 and 0.01 alloys exhibit two doublets (doublet 1, 2). That of x=0.02 alloys shows two doublets (doublet 1, 2) and one sextuplet, and that of x=0.08 alloy has only one sextuplet. Doublet 1 for x=0.005, 0.01 and 0.02 alloys is considered to result from a fraction of Fe in excess showing a superparamagnetic behavior. Doublet 2 is considered to result from the Fe substituted for Ni in the Mg2Ni phase. The values of isomer shift 0.25–0.29 mm/s suggest that the iron exists in the state Fe+3. The result that the quadrupolar splitting of doublet 2 is not zero shows that the distribution of electrons around the iron is asymmetric. Their values for the doublet 2, 1.21–1.39 mm/s, approach the value of quadrupolar splitting for the oxidation number +3. The sextuplet showing the magnetic hyperfine interactions results from the iron, which has not substituted the nickel in the Mg2Ni phase. The Mössbauer spectrum of the x=0.01 alloy hydrided at 723 K shows one doublet and sextuplet. The segregation of Fe is considered to result from the reaction of the Mg2Ni phase with the oxygen contained in the hydrogen as impurity... | |
| dc.language.iso | en | |
| dc.publisher | Elsevier | |
| dc.subject.en | Mg2Ni1−xFex | |
| dc.subject.en | Mössbauer resonance | |
| dc.subject.en | Fe+3 | |
| dc.subject.en | Asymmetric distribution of electrons | |
| dc.subject.en | Segregation of iron | |
| dc.title.en | Study of Mg2Ni1−xFex alloys by Mössbauer resonance | |
| dc.type | Article de revue | |
| dc.identifier.doi | 10.1016/S0360-3199(02)00153-2 | |
| dc.subject.hal | Chimie/Matériaux | |
| bordeaux.journal | International Journal of Hydrogen Energy | |
| bordeaux.page | 809-814 | |
| bordeaux.volume | 28 | |
| bordeaux.issue | 8 | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-00198567 | |
| hal.version | 1 | |
| hal.popular | non | |
| hal.audience | Internationale | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-00198567v1 | |
| bordeaux.COinS | ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=International%20Journal%20of%20Hydrogen%20Energy&rft.date=2003&rft.volume=28&rft.issue=8&rft.spage=809-814&rft.epage=809-814&rft.eissn=0360-3199&rft.issn=0360-3199&rft.au=SONG,%20Myoung-Youp&FOURN%C3%88S,%20L%C3%A9opold&DARRIET,%20Bernard&rft.genre=article |
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