Effects of La₂O₃ and MnO₂ on the piezoelectric properties of 0.02Pb(Y_2/3W_1/3)O₃−0.98Pb(Zr_0.52Ti_0.48)0₃

The effects of the addition of La₂O₃ (0.1 wt. %−1 wt. %) and MnO₂ (0.1 wt. %−1 wt. %) on the piezoelectric properties of the 0.02Pb(Y_2/3W_1/3)O₃−0.98Pb(Zr_0.52Ti_0.48)O₃ system were investigated to develop the composition available for an actuator. In the case of the addition of La₂O₃ to the system, the maximum values of d₃₃ and k_p were observed in the 0.1 wt. % La₂O₃, and the values of Q_m did not change with the amount of La₂O₃. The values of d₃₃, k_p, and Q_m were 428 × 10⁻¹² C/N, 57%, and 71, respectively. On the other hand, the introduction of 0.5 wt. % MnO₂ as an acceptor into the system resulted in the maximum Q_m value of 741, exhibiting a d₃₃ of 298 × 10⁻¹² C/N, and a k_p of 50%. In the case of the simultaneous addition of La₂O₃ and MnO₂, the best piezoelectric properties are obtained from the composition of 0.02Pb(Y_2/3W_1/3)O₃−0.98Pb(Zr_0.52Ti_0.48)O₃ + 0.1 wt. % La₂O₃ + 0.3 wt. % MnO₂. The values of d₃₃, k_p, and Q_m were 345 × 10⁻¹² C/N, 55%, and 741, respectively.