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

Centro de Investigación y de Estudios Avanzados del IPN, Lib. Norponiente No. 2000, Fracc. Real de Juriquilla 76230, Querétaro, Qro. Mexico
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Materials 2018, 11(3), 361; https://doi.org/10.3390/ma11030361
Received: 22 January 2018 / Revised: 16 February 2018 / Accepted: 26 February 2018 / Published: 1 March 2018
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)(Bi0.5Na0.5)TiO3 + x(Bi0.5K0.5)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 d33 = 109 pC/N, kt = 0.52, and kp = 0.24. Changes in microstructure as a function of BKT content are also presented and discussed. View Full-Text
Keywords: lead-free ceramics; BNT/BKT; sintering; morphotropic phase boundary; functional properties lead-free ceramics; BNT/BKT; sintering; morphotropic phase boundary; functional properties
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Fernandez-Benavides, D.A.; Gutierrez-Perez, A.I.; Benitez-Castro, A.M.; Ayala-Ayala, M.T.; Moreno-Murguia, B.; Muñoz-Saldaña, J. Comparative Study of Ferroelectric and Piezoelectric Properties of BNT-BKT-BT Ceramics near the Phase Transition Zone. Materials 2018, 11, 361.

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