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Dielectric, Ferroelectric, and Piezoelectric Properties of Bi(Ni1/2Ti1/2)O3‐Modified BiFeO3BaTiO3 Ceramics with High Curie Temperature

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New piezoelectric ceramics, 0.71BiFe1−x (Ni1/2Ti1/2) x O3−0.29BaTiO3+0.6 wt% MnO2 [BFNTx–BT] (= 0–0.09), were fabricated using conventional mixed‐oxide method. It was found that the introduction of BNT into BF‐BT system caused insignificant change in crystal structure, which is a single‐phase perovskite structure. However, an obvious variation in microstructure took place. The ceramics with composition of = 0.03 showed enhanced piezoelectric, electromechanical, and ferroelectric properties with piezoelectric constant d 33 = 156 pC/N, planar electromechanical coupling factors k p = 0.308, remnant polarization P r = 22.5 μC/cm2, and coercive field E c = 28.2 kV/cm, with a high Curie temperature T c = 431°C, respectively. The combination of good piezoelectric properties and high T c makes these ceramics suitable for elevated temperature piezoelectric devices.

Document Type: Research Article


Publication date: December 1, 2012


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