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Open AccessArticle

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

1
Physical Department, Voronezh State University, University sq. 1, 394018 Voronezh, Russia
2
Laboratoire de Physique de la Matière Condensée, Universite de Picardie Jules Verne, 80039 Amiens CEDEX, France
3
UFR Sciences and Techniques, University of Toulon, 83041 Toulon CEDEX, France
4
Sciences and Arts, University of Nimes, 30021 Nimes CEDEX, France
*
Author to whom correspondence should be addressed.
Materials 2018, 11(8), 1436; https://doi.org/10.3390/ma11081436
Received: 9 July 2018 / Revised: 11 August 2018 / Accepted: 13 August 2018 / Published: 14 August 2018
(This article belongs to the Special Issue Advanced Functional Nanomaterials and Their Applications)
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 °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 104 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/ε(T) for the studied samples shows that, in the investigated superlattice, both Curie–Weiss law and the law of “two” were followed. Additionally, the ε(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. View Full-Text
Keywords: ferroelectric nanocomposites; smart materials; phase transitions; dielectric properties ferroelectric nanocomposites; smart materials; phase transitions; dielectric properties
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MDPI and ACS Style

Sidorkin, A.; Nesterenko, L.; Gagou, Y.; Saint-Gregoire, P.; Vorotnikov, E.; Popravko, N. Dielectric Properties and Switching Processes of Barium Titanate–Barium Zirconate Ferroelectric Superlattices. Materials 2018, 11, 1436.

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