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Open AccessArticle

Crossover from Ferroelectric to Relaxor Behavior in Ba1−xCaxTiO3 (x = 0.17) System

1
Institute of Applied Electrodynamics and Telecommunications, Vilnius University, Sauletekio av. 3, LT-10257 Vilnius, Lithuania
2
Institute of Physics, University of Silesia, ul. 75 Pułku Piechoty 1, PL-40-500 Chorzów, Poland
*
Author to whom correspondence should be addressed.
Materials 2020, 13(12), 2854; https://doi.org/10.3390/ma13122854
Received: 22 May 2020 / Revised: 18 June 2020 / Accepted: 22 June 2020 / Published: 25 June 2020
(This article belongs to the Special Issue Ferroelectric Materials: From Fundamentals to Applications )
The dielectric properties of Ba1−xCaxTiO3 (x = 0.17) ceramics were studied in a wide frequency range of 20 Hz–53 GHz. Diffused ferroelectric phase transition was revealed close to 339 K in the dielectric properties of ceramics. The behaviour of distributions of relaxation times in vicinity of the ferroelectric phase transition temperature is also typical for order-disorder ferroelectric phase transition. However, at lower temperatures (below 200 K), the most probable relaxation increased according to the Arrhenius law. At lower temperatures the maximum of the imaginary part of dielectric permittivity versus temperature strongly shifted to higher temperatures when the frequency increased (from 125 K at 1.21 kHz to 300 K at 33 GHz). This behaviour was attributed to the dynamics of Ti ions. The origin of the crossover from ferroelectric to relaxor behaviour of Ba1−xCaxTiO3 (x = 0.17) ceramics is discussed in the paper. View Full-Text
Keywords: BaTiO3; relaxors; ferroelectrics; dielectric permittivity BaTiO3; relaxors; ferroelectrics; dielectric permittivity
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MDPI and ACS Style

Palaimiene, E.; Macutkevic, J.; Banys, J.; Winiarski, A.; Gruszka, I.; Koperski, J.; Molak, A. Crossover from Ferroelectric to Relaxor Behavior in Ba1−xCaxTiO3 (x = 0.17) System. Materials 2020, 13, 2854.

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