A constrained domain-switching model for polycrystalline ferroelectric ceramics. Part II: Combined switching and application to rhombohedral materials

✍ Scribed by F.X. Li; R.K.N.D. Rajapakse

• Publisher: Elsevier Science
• Year: 2007
• Tongue: English
• Weight: 300 KB
• Volume: 55
• Category: Article
• ISSN: 1359-6454
• DOI: 10.1016/j.actamat.2007.08.003

✦ Synopsis

A combined switching assumption (CSA) is incorporated into the constrained domain-switching model presented in part I to address the nonsymmetric deformations of ferroelectric ceramics under tension and compression. Using the CSA, the domain-switching process in rhombohedral ferroelectric/ferroelastic ceramics is analyzed in detail. The results show that in rhombohedral lead titanate zirconate (PZT) ceramics, most 109°switching can be accomplished with a minor fraction of 71°switching during electric poling, which is quite different from BaTiO 3 and tetragonal PZT ceramics in which only a few per cent of 90°switching can occur. Domain switching under combined uniaxial electric and mechanical tension/compression is also studied. Uniaxial tension is found to enhance electric poling while uniaxial compression inhibits it.