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Federicci, R., Hole, S., Popa, A. F., Brohan, L., Baptiste, B., Mercone, S. & Leridon, B. (2017) Rb2Ti2O5: Superionic conductor with colossal dielectric constant. Physical Review Materials, 1 032001.
Added by: Richard Baschera (2018-02-08 08:55:28) Last edited by: Richard Baschera (2018-02-08 08:57:56) |
| Type de référence: Article DOI: 10.1103/PhysRevMaterials.1.032001 Clé BibTeX: Federicci2017 Voir tous les détails bibliographiques  |
Catégories: ID2M Créateurs: Baptiste, Brohan, Federicci, Hole, Leridon, Mercone, Popa Collection: Physical Review Materials |
Consultations : 1/428
Indice de consultation : 4% Indice de popularité : 1% |
| Résumé |
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Electrical conductivity and high dielectric constant are in principle self-excluding, which makes the terms insulator and dielectric usually synonymous. This is certainly true when the electrical carriers are electrons, but not necessarily in a material where ions are extremely mobile, electronic conduction is negligible, and the charge transfer at the interface is immaterial. Here we demonstrate in a perovskite-derived structure containing five-coordinated Ti atoms, a colossal dielectric constant (up to 10(9)) together with very high ionic conduction 10(-3) S cm(-1) at room temperature. Coupled investigations of I-V and dielectric constant behavior allow us to demonstrate that, due to ion migration and accumulation, this material behaves like a giant dipole, exhibiting colossal electrical polarization (of the order of 0.1 C cm(-2)). Therefore it may be considered as a "ferro-ionet" and is extremely promising in terms of applications.
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