Effective piezoelectricity of PZT-based relaxor ferroelectric compositions

Abstract

Electrostrictive strain x, DC-biased dielectric constant ^b K ₃₃, DC bias field-induced electromechanical planar coupling factor ^bk_p and piezoelectric strain coefficient ^bd₃₁ of La, Bi, Sr and Nb modified PBZT and Ba-A-side doped PLZT compositions were investigated and discussed in this paper. Some of the compositions with low hysteresis and small temperature coefficients of the DC bias field-induced piezoelectric properties were developed. A ferroelectric phenomenological theory for DC bias field-induced piezoelectric effect (effective piezoelectric effect) was developed and employed to reveal the relationship between the instant and the effective piezoelectric properties of the materials.

Key Words:

• Electrostrictive
• DC bias
• dielectric constant
• effective piezoelectric effect
• PBZT
• PLZT