Creep behavior of soft and hard PZT ceramics during mechanical loading and unloading. Issue 14 (November 2015)

• Record Type: Journal Article
• Authors: Li, Y.W.; Li, Y.H.; Li, F.X.
• Is Part Of: Journal of the European Ceramic Society. Volume 35:Issue 14(2015:Nov.)
• Page Start: 3827
• Page End: 3834
• Publication Date: 2015-11
• Subjects: PZT ceramics -- Domain switching -- Creep -- Internal bias field -- Defect dipole; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2015.06.019
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: The creep behavior of strain and electrical polarization in two poled PZT with different compositions was investigated during stress loading and unloading. Being different from the standard testing methods, the creep behaviors at all stress levels were characterized using a single sample, rather than a fresh sample at each load level. During loading, the creep of polarization and strain are observed at higher stress than that in soft PZT due to the effect of internal bias field. During unloading, significant recovery of strain and polarization was observed in the hard PZT, demonstrating that a compressive stress of 380 MPa cannot reorient the ordered defect dipoles in Fe doped hard PZT. Two equations P 0.5 = α 1 log ( t + t 0 ) + β 1 and S creep 0.5 = a 2 log ( t + t 0 ) + β 2 S creep 0.5 = a 2 log ( t + t 0 ) + β 2 were summarized to describe the creep polarization and the creep strain, respectively. Compared with the conventional power law creep equations, the two equations can fit the experimental results well in the whole range of stress holding.