Effects of electrical boundary conditions and poling approaches on the mechanical depolarization behavior of PZT ceramics

• Published in: Acta materialia Vol. 53; no. 9; pp. 2665 - 2673
• Main Authors: Li, Fa-Xin, Fang, Dai-Ning
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.05.2005; Elsevier Science
• Subjects: Applied sciences; Bias; Boundary conditions; Building materials. Ceramics. Glasses; Ceramic industries; Ceramics; Chemical industry and chemicals; Circuits; Deoxidizing; Depolarization; Electrical boundary; Exact sciences and technology; Ferroelectric ceramics; Internal bias field; Mathematical analysis; Mechanical depolarization; Short circuits; Technical ceramics; Ferroelectric ceramics; Electrical boundary; Internal bias field; Mechanical depolarization; Lead titanates; Mechanical properties; Boundary condition; Ceramic materials; Piezoelectric ceramics; Lead zirconates
• ISSN: 1359-6454; 1873-2453
• DOI: 10.1016/j.actamat.2005.02.031

In this investigation, the effects of electrical boundary conditions and poling approaches on the mechanical depolarization behavior of lead titanate zirconate ceramics are experimentally studied. Depolarization is more difficult to realize in open circuit than in short circuit, i.e., the material appears “harder” in open circuit. In short circuit, a ceramic poled with an impact electric loading at room temperature (with a negligible internal bias field) is easier to be mechanically depolarized than a ceramic poled at 120 °C with a gradually increasing electric loading (with an internal bias field of about 250 V/mm). While in open circuit, the case is completely the contrary. An analytical domain-switching model is proposed to explain the effects of electrical boundary conditions on the mechanical depolarization of ferroelectric ceramics.