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High-temperature phase transition in the three-layered sodium cobaltite Pf3-NaxCoO2 (x~0.62)
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | BLANGERO, Maxime | |
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | CARLIER-LARREGARAY, Dany | |
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | POLLET, Michaël | |
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | DARRIET, Jacques | |
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | DELMAS, Claude | |
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | DOUMERC, Jean-Pierre | |
| dc.date.issued | 2008 | |
| dc.identifier.issn | 1098-0121 | |
| dc.description.abstractEn | The high temperature phase transition in the three-layered P[prime]3-NaxCoO2 (x~0.62) has been investigated by means of heat capacity measurement, x-ray diffraction, and 23Na magic angle spinning (MAS)–NMR spectroscopy in the 300–550 K range. The phase transition occurs nearby TS=350 K. Below TS, the unit cell is monoclinic (space group C2/m). Above TS, the monoclinic cell is reversibly converted into a rhombohedral cell (space group R3m). The crystallographic change mainly manifests into Na rearrangement in the interslab from a low symmetry position to a higher symmetry position. A global picture for both systems of the (x,y,z) off-center position of Na could be understood as a balance between on-site Na+-Co3+/4+ electrostatic repulsions (z shift) and in-plane Na+-Na+ electrostatic repulsions (xy shift). We suggest that Na+ interlayer redistribution is the driving force of the phase transition. 23Na MAS-NMR spectroscopy has been used to investigate changes in the environment and in the distribution of the sodium cations occurring by raising the temperature. The gradual suppression of the second-order quadrupolar interactions and the resulting new resonance is consistent with the sodium site exchange mechanism. Changes in the resistivity at TS suggest a strong coupling between the Na+ and CoO2 layers. | |
| dc.language.iso | en | |
| dc.publisher | American Physical Society | |
| dc.subject.en | Phase transition | |
| dc.subject.en | Inorganic compounds | |
| dc.subject.en | High temperature | |
| dc.subject.en | Sodium cobaltite | |
| dc.subject.en | MAS–NMR spectroscopy | |
| dc.title.en | High-temperature phase transition in the three-layered sodium cobaltite Pf3-NaxCoO2 (x~0.62) | |
| dc.type | Article de revue | |
| dc.identifier.doi | 10.1103/PhysRevB.77.184116 | |
| dc.subject.hal | Chimie/Matériaux | |
| bordeaux.journal | Physical Review B: Condensed Matter and Materials Physics (1998-2015) | |
| bordeaux.page | 184116 (8 p.) | |
| bordeaux.volume | 77 | |
| bordeaux.issue | 18 | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-00286556 | |
| hal.version | 1 | |
| hal.popular | non | |
| hal.audience | Internationale | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-00286556v1 | |
| bordeaux.COinS | ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Physical%20Review%20B:%20Condensed%20Matter%20and%20Materials%20Physics%20(1998-2015)&rft.date=2008&rft.volume=77&rft.issue=18&rft.spage=184116%20(8%20p.)&rft.epage=184116%20(8%20p.)&rft.eissn=1098-0121&rft.issn=1098-0121&rft.au=BLANGERO,%20Maxime&CARLIER-LARREGARAY,%20Dany&POLLET,%20Micha%C3%ABl&DARRIET,%20Jacques&DELMAS,%20Claude&rft.genre=article |
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