Dielectric Properties and Switching Processes of Barium Titanate-Barium Zirconate Ferroelectric Superlattices

Alexander Sidorkin , Lolita Nesterenko , Yaovi Gagou (1) , Pierre Saint-Grégoire (2) , Eugeniy Vorotnikov , Nadezhda Popravko

1 LPMC - Laboratoire de Physique de la Matière Condensée - UR UPJV 2081
2 UTLN UFR ScT - Université de Toulon - UFR Sciences et Techniques

This article is devoted to the investigation of the dielectric and repolarization properties of barium zirconate and barium titanate BaZrO3/BaTiO3 superlattices with a period of 13.322 nm on a monocrystal magnesium oxide (MgO) substrate. Synthesized superlattices demonstrated a ferroelectric phase transition at a temperature of approximately 393 degrees C, which is far higher than the Curie temperature of BaTiO3 thin films and bulk samples. The dielectric permittivity of the superlattice reached more than 10(4) at maximum. As the electric field frequency increased, the dielectric constant of the studied superlattice decreased over the entire study temperature range, but position of the maximum dielectric constant remained the same with changing frequency. The temperature dependence of the inverse dielectric permittivity 1/'' (T) for the studied samples shows that, in the investigated superlattice, both Curie- Weiss law and the law of `` two'' were followed. Additionally, the `` (T) dependences showed practically no temperature hysteresis with heating and cooling. Samples of synthesized superlattices had a relatively small internal bias field, which was directed from the superlattice towards the substrate.

Domaines: Matière Condensée [cond-mat]

Alexander Sidorkin, Lolita Nesterenko, Yaovi Gagou, Pierre Saint-Grégoire, Eugeniy Vorotnikov, et al.. Dielectric Properties and Switching Processes of Barium Titanate-Barium Zirconate Ferroelectric Superlattices. Materials, 2018, 11 (8), ⟨10.3390/ma11081436⟩. ⟨hal-03627644⟩