Stabilization of over-stoichiometric Mn<sup>4+</sup> in layered Na<sub>2/3</sub>MnO<sub>2</sub>
| hal.structure.identifier | Institute of General and Inorganic Chemistry | |
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | STOYANOVA, R. | |
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | CARLIER-LARREGARAY, Dany | |
| hal.structure.identifier | Central Laboratory of Solar Energy and New Energy Sources [CL SENES] | |
| dc.contributor.author | SENDOVA-VASSILEVA, M. | |
| hal.structure.identifier | Institute of General and Inorganic Chemistry | |
| dc.contributor.author | YONCHEVA, M. | |
| hal.structure.identifier | Institute of General and Inorganic Chemistry | |
| dc.contributor.author | ZHECHEVA, E. | |
| hal.structure.identifier | Institute of General and Inorganic Chemistry | |
| hal.structure.identifier | Central Laboratory of Mineralogy and Crystallography | |
| dc.contributor.author | NIHTIANOVA, D. | |
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | DELMAS, Claude | |
| dc.date.issued | 2010 | |
| dc.identifier.issn | 0022-4596 | |
| dc.description.abstractEn | Sodium manganates with nominal composition Na<sub>2/3</sub>MnO<sub>2</sub> were prepared by solid state reaction between Na<sub>2</sub>CO<sub>3</sub> and MnCO<sub>3</sub> at 1000 °C. The composition and structure of Na<i><sub>x</sub></i>MnO<sub>2</sub> were controlled by the rate of cooling from the temperature of preparation. This is a consequence of the capability of Na<sub>2/3</sub>MnO<sub>2</sub> to accommodate over<i>-</i>stoichiometric Mn<sup>4+</sup> ions up to 12.5%. Structural characterization was carried out by XRD powder diffractions, TEM analysis and Raman spectroscopy. The composition and oxidation state of manganese were determined by chemical analysis and magnetic susceptibility measurements. The manganese distribution in the layers was analysed using electron paramagnetic resonance (EPR) spectroscopy. By quenching from 1000 °C, the orthorhombic distorted modification is stabilized. A phase separation into orthorhombic and hexagonal modifications takes place when Na<sub>2/3</sub>MnO<sub>2</sub> is slow cooled. The structure changes are concomitant with an increase in the oxidation state of Mn. The over<i>-</i>stoichiometric Mn<sup>4+</sup> ions are accommodated in the hexagonal modification by creation of vacancies in the MnO<sub>2</sub><i>-</i>layers. | |
| dc.language.iso | en | |
| dc.publisher | Elsevier | |
| dc.subject.en | Layered oxides | |
| dc.subject.en | Sodium manganates | |
| dc.subject.en | Electron paramagnetic resonance spectroscopy | |
| dc.subject.en | Raman spectroscopy | |
| dc.title.en | Stabilization of over-stoichiometric Mn<sup>4+</sup> in layered Na<sub>2/3</sub>MnO<sub>2</sub> | |
| dc.type | Article de revue | |
| dc.identifier.doi | 10.1016/j.jssc.2010.04.024 | |
| dc.subject.hal | Chimie/Matériaux | |
| bordeaux.journal | Journal of Solid State Chemistry | |
| bordeaux.page | 1372-1379 | |
| bordeaux.volume | 183 | |
| bordeaux.issue | 6 | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-00494476 | |
| hal.version | 1 | |
| hal.popular | non | |
| hal.audience | Internationale | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-00494476v1 | |
| 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=2010&rft.volume=183&rft.issue=6&rft.spage=1372-1379&rft.epage=1372-1379&rft.eissn=0022-4596&rft.issn=0022-4596&rft.au=STOYANOVA,%20R.&CARLIER-LARREGARAY,%20Dany&SENDOVA-VASSILEVA,%20M.&YONCHEVA,%20M.&ZHECHEVA,%20E.&rft.genre=article |
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