Abstract
The crystal structure, microstructure, and piezoelectric properties of 1-wt% MnO-doped (1 − x)KNbO3-xBiFeO3 (x = 0 ∼ 0.05) ceramics were investigated. The crystal structure changed from orthorhombic to pseudo-cubic around x = 0.005 in the (1 − x)KNbO3-xBiFeO3 ceramics. The addition of BiFeO3 to KNbO3 reduced the grain size and led to poor densification. The Dielectric constant showed a maximum at x = 0.005 where the crystal structure changed. The KNbO3 ceramic had a pinched P-E hysteresis loop. KNbO3-BiFeO3 ceramics had lower remanent polarizations (Pr) than KNbO3, probably due to the effect of small grain size. The KNbO3 ceramic showed good piezoelectric properties; a planar electromechanical factor (kp) of 0.304, a mechanical quality factor (Qm) of 281, and a piezoelectric constant (d33) of 121 pC/N. The KNbO3-BiFeO3 ceramic, however, had inferior piezoelectric properties compared to KNbO3 due to the incomplete poling resulting from the small grain size, low density, and low insulating resistance.
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