Effects of Lateral Stress on the Electromechanical Response of Ferroelectric Ceramics: Experiments versus Model

• Published in: Journal of intelligent material systems and structures 2005-07, Vol.16 (7-8), p.583-588
• Main Authors: Li, Fa-Xin, Fang, Dai-Ning
• Format: Article
• Language: English
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; Domain effects, magnetization curves, and hysteresis; Exact sciences and technology; Fracture mechanics (crack, fatigue, damage...); Fundamental areas of phenomenology (including applications); General equipment and techniques; Instruments, apparatus, components and techniques common to several branches of physics and astronomy; Magnetic properties and materials; Measurement and testing methods; Physics; Servo and control equipment; robots; Solid mechanics; Structural and continuum mechanics
• ISSN: 1045-389X; 1530-8138
• DOI: 10.1177/1045389X05051627

Mechanical depolarization is an important cause of failure in piezoelectric actuators and sensors. In this paper, the effects of one-dimensional lateral pressure on the linear and nonlinear behavior of PZT ceramics were experimentally studied. The experimental results show that the lateral pressure can change the crystal symmetry of the ceramic from 1mm to mm2. A domain-switching model dividing each 180 switching to two successive 90 switching is proposed to explain the experimental results. Finally, based on the experimental results, a simple design is proposed to prevent piezoelectric sensors from mechanical depolarization. Meanwhile, the simple design is apt to increase the hydrostatic piezoelectric constant of the piezoelectric marine sensors, thus enhancing their sensitivity.