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

来源：

MATERIALS | 2018年 / 11卷 / 03期

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.

引用

页数：16

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