Piezoelectric and Ferroelectric Properties of Lead-Free Bi_4−xNd_xTi_2.97V_0.03O₁₂ Ceramics

We fabricated lead-free Bi _4−xNd_xTi _2.97 V _0.03 O ₁₂ (x = 0.25∼1.00; BNdTV-x) ceramics using the conventional solid-state reaction method and investigated their ferroelectric and piezoelectric properties. BNdTV ceramics exhibited the phase transition from orthorhombic to pseudo-tetragonal structure with increasing Nd concentration. At the morphotropic phase boundary of x = 0.85, BNdTV ceramics showed the highest values of P _r (13 μC/cm ² ), k _t (17%) and Q _m (2130), which are promising for applications to high frequency resonators.

Keywords:

• lead-free
• bismuth-layered structure
• piezoelectricity
• ferroelectricity

Acknowledgment

This work was supported by a grant from the device and materials technology development program of the Ministry of Commerce, Industry and Energy, Republic of Korea.