Chiang Mai Journal of Science

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Piezoelectric materials are presently being extensively developed for applications such as ultrasonic motors and piezoelectric transformers. In this study, the dielectric, piezoelectric, and ferroelectric properties of  MnO₂-doped 0.2Pb(Zn_1/3 Nb_2/3)O₃ -0.8Pb(Zr_1/2Ti_1/2)O₃ (here after 0.2PZN - 0.8PZT), which is the morphotropic phase boundary composition of  the PZN-PZT system, were investigated. It was found that crystal structure moved to rhombohedral side when increasing MnO₂  content.  With the addition of  MnO₂ , Curie temperature T_c , the piezoelectric constant d₃₃ , and electromechanical coupling factor k_p  were slightly decreased, but the mechanical quality factor Q_m  was significantly increased. The P–E  and  s-E loop demonstrated decreased P_r and strain level but increased E_c with addition of  MnO₂ These. results clearly showed the significance of  MnO₂ addition on the electrical properties of  the PZN–PZT system with ‘‘hard’’ characteristics.

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