Nonlinear Shear Response in (K,Na)NbO3-Based Lead-Free Piezoelectric Ceramics
The piezoelectric shear response of 94.0(Ka0.5, Na0.5)NbO3 (KNN) + 5.0LiNbO3 (LN) + 0.5SrTiO3 (ST) + 0.5BiFeO3 (BF) ceramics was investigated by Laser Doppler Vibrometry (LDV) and resonance-antiresonance method. From resonance-antiresonance method, the piezoelectric d15 constant was obtained to be 273 pC/N. The shear strain obtained by LDV at the frequency of 150kHz showed strong nonlinearity. This suggested that the domain contribution to piezoelectric response in shear mode of KNN-LN-ST-BF ceramics existed at the operational frequency for the shear mode divices.
Shinobu Fujihara and Tadashi Takenaka
M. Hagiwara et al., "Nonlinear Shear Response in (K,Na)NbO3-Based Lead-Free Piezoelectric Ceramics", Key Engineering Materials, Vol. 445, pp. 47-50, 2010