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Dielectric, Ferroelectric, and Piezoelectric Properties of Bi ( Ni 1/2 Ti 1/2 ) O 3 ‐Modified BiFeO 3 – BaTiO 3 Ceramics with High Curie Temperature
Author(s) -
Zhou Qin,
Zhou Changrong,
Yang Huabin,
Chen Guohua,
Li Weizhou,
Wang Hua
Publication year - 2012
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2012.05387.x
Subject(s) - ferroelectricity , chemistry , materials science , piezoelectricity , dielectric , composite material , optoelectronics
New piezoelectric ceramics, 0.71 BiFe 1− x ( Ni 1/2 Ti 1/2 ) xO 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.