[Sans titre]
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | BALITEAU, Sébastien | |
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | MAUVY, Fabrice | |
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | FOURCADE, Sébastien | |
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | GRENIER, Jean-Claude | |
| dc.date.issued | 2009 | |
| dc.identifier.issn | 1293-2558 | |
| dc.description.abstractEn | The structure, conductivity and water uptake of the oxygen-deficient perovskite-type compound Ba<sub>4</sub>Ca<sub>2</sub>Ta<sub>2</sub>O<sub>11</sub> have been investigated. Ba<sub>4</sub>Ca<sub>2</sub>Ta<sub>2</sub>O<sub>11</sub> crystallizes in the cryolite structure (cubic, <i>Fm</i>3<i>m</i> SG) with <i>a</i> = 8.4508(2) Å, under dry air. The compound can be partially hydrated up to a maximum water content of approximately 0.52 mol H<sub>2</sub>O per mol Ba<sub>4</sub>Ca<sub>2</sub>Ta<sub>2</sub>O<sub>11</sub>. In moist air, the structure symmetry becomes monoclinic (<i>C</i>2/<i>m</i>) and the temperature dependence of total conductivity shows a different behavior because of changes in transport mechanism. Three regions can be observed as a function of temperature. For the low temperature range 200–400 °C, the protonic conduction is prevailing with an activation energy <i>E</i><sub>A</sub> = 0.85 eV. In the intermediate temperature range (400–600 °C), O<sup>2−</sup> anionic and protonic conductions are mixed with an activation energy <i>E</i><sub>A</sub> = 0.45 eV and in the third region, for temperatures above 600 °C, O<sup>2−</sup>conduction is prevailing with an activation energy <i>E</i><sub>A</sub> = 0.85 eV. | |
| dc.language.iso | en | |
| dc.publisher | Elsevier | |
| dc.type | Article de revue | |
| dc.identifier.doi | 10.1016/j.solidstatesciences.2009.06.023 | |
| dc.subject.hal | Chimie/Matériaux | |
| bordeaux.journal | Solid State Sciences | |
| bordeaux.page | 1572-1575 | |
| bordeaux.volume | 11 | |
| bordeaux.issue | 9 | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-00432660 | |
| hal.version | 1 | |
| hal.popular | non | |
| hal.audience | Internationale | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-00432660v1 | |
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