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

被引:55
作者
Andres Fernandez-Benavides, David [1 ]
Ibeth Gutierrez-Perez, Aixa [1 ]
Maria Benitez-Castro, Angelica [1 ]
Teresa Ayala-Ayala, Maria [1 ]
Moreno-Murguia, Barbara [1 ]
Munoz-Saldana, Juan [1 ]
机构
[1] IPN, Ctr Invest & Estudios Avanzados, Lib Norponiente 2000, Queretaro 76230, Qro, Mexico
关键词
lead-free ceramics; BNT/BKT; sintering; morphotropic phase boundary; functional properties; X-RAY-DIFFRACTION; ELECTRICAL-PROPERTIES; BARIUM-TITANATE; DIELECTRIC-PROPERTIES; GRAIN-SIZE; SECONDARY PHASES; LEAD; BOUNDARY; RAMAN; TEMPERATURE;
D O I
10.3390/ma11030361
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
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 mu C/cm(2), a coercive field = 36.9 kV/cm, and piezoelectric values of d(33) = 109 pC/N, k(t) = 0.52, and k(p) = 0.24. Changes in microstructure as a function of BKT content are also presented and discussed.
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页数:16
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