Comparative Study of Ferroelectric and Piezoelectric Properties of BNT-BKT-BT Ceramics near the Phase Transition Zone.

Authors :: Fernandez-Benavides DA
Gutierrez-Perez AI
Benitez-Castro AM
Ayala-Ayala MT
Moreno-Murguia B
Muñoz-Saldaña J
Source :: Materials (Basel, Switzerland) [Materials (Basel)] 2018 Mar 01; Vol. 11 (3). Date of Electronic Publication: 2018 Mar 01.
Publication Year :: 2018
Abstract: We report a comprehensive comparative study of ferroelectric and piezoelectric properties of BNT-BKT-BT ceramics through the MPB (morphotropic phase boundary) zone, from the rhombohedral to the tetragonal phases in the system (97.5- x )(Bi <subscript>0.5</subscript> Na <subscript>0.5</subscript> )TiO₃ + x (Bi <subscript>0.5</subscript> K <subscript>0.5</subscript> )TiO₃ + 2.5(BaTiO₃), where x = 0 to 24.5 mol %. The structural transitions were studied by XRD patterns and Raman spectra. The MPB was confirmed between x = 10 and 12.5 mol % BKT. The dielectric/ferroelectric/piezoelectric properties of the BNT-BKT-BT system are maximized in the MPB region exhibiting a dielectric constant of 1506, a remanent polarization of 34.4 μC/cm², a coercive field = 36.9 kV/cm, and piezoelectric values of d <subscript>33</subscript> = 109 pC/N, k <subscript>t</subscript> = 0.52, and k <subscript>p</subscript> = 0.24. Changes in microstructure as a function of BKT content are also presented and discussed.<br />Competing Interests: Authors confirm that the content of this article has no conflict of interest.

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