Publication Date:
2012-08-23
Description:
New piezoelectric ceramics, 0.71 BiFe 1− x ( Ni 1/2 Ti 1/2 ) x O 3 −0.29 BaTiO 3 +0.6 wt% MnO 2 [BFNT x –BT] ( x = 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 x = 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/cm 2 , 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.
Print ISSN:
0002-7820
Electronic ISSN:
1551-2916
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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