Surface segregation in Nb-doped BaTiO<sub>3</sub> films
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | ARVEUX, Emmanuel | |
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | PAYAN, Sandrine | |
| hal.structure.identifier | Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB] | |
| dc.contributor.author | MAGLIONE, Mario | |
| hal.structure.identifier | Institute of Materials Science | |
| dc.contributor.author | KLEIN, Andréas | |
| dc.date.issued | 2010 | |
| dc.identifier.issn | 0169-4332 | |
| dc.description.abstractEn | We have used in situ photoemission spectroscopy to investigate Niobium doping in polycristalline BaTiO<sub>3</sub>. The valence band maximum position progressively shifts from 2.5 eV for undoped to 2.84 eV for Nb-doped films. Ceramics and single crystal have been investigated for comparison with thin films. Nb-doped BaTiO<sub>3</sub> ceramics and Nb-doped SrTiO<sub>3</sub> single crystal show higher Fermi level position indicating that our doped films are less conducting regarding their bulk parents. This was confirmed by impedance spectroscopy under variable temperature. Large amount of niobium is clearly observable at surface but the amount of dopant is drastically reduced below the near-surface region, as evidenced by depth profile. Therefore, we provide evidence of surface segregation which would explain the contrasted resistivity values reported in literature for such donor-doped films. | |
| dc.language.iso | en | |
| dc.publisher | Elsevier | |
| dc.subject.en | BaTiO3 | |
| dc.subject.en | Titanates | |
| dc.subject.en | Films | |
| dc.subject.en | PTCR | |
| dc.subject.en | Segregation | |
| dc.subject.en | Surfaces | |
| dc.subject.en | XPS | |
| dc.title.en | Surface segregation in Nb-doped BaTiO<sub>3</sub> films | |
| dc.type | Article de revue | |
| dc.identifier.doi | 10.1016/j.apsusc.2010.03.146 | |
| dc.subject.hal | Chimie/Matériaux | |
| bordeaux.journal | Applied Surface Science | |
| bordeaux.page | 6228-6232 | |
| bordeaux.volume | 256 | |
| bordeaux.issue | 21 | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-00494479 | |
| hal.version | 1 | |
| hal.popular | non | |
| hal.audience | Internationale | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-00494479v1 | |
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