A Levstik et al 1998 J. Phys. D: Appl. Phys. 31 2894 doi:10.1088/0022-3727/31/20/025
A Levstik, V Bobnar, Z Kutnjak and M Kosec
Show affiliationsCorrelations between the ferroelectric fatigue and variations in mechanical properties have been investigated by simultaneous measurement of the fatigue and the piezoelectric resonance of bar 8/65/35 PLZT ceramics. It was found that the fatigue reflects itself only in dielectric and piezoelectric properties. Namely, the remanent polarization, the complex dielectric and piezoelectric constants and the electromechanical coupling factor all start to decrease at the same number of switching cycles. On the other hand, the complex elastic compliance remains almost unchanged during the fatigue process. In addition, the electrical, mechanical and electromechanical quality factors, determined at the piezoelectric resonance frequency, remain constant with the increasing number of switching cycles. This suggests that there is no correlation between the ferroelectric fatigue process and the mechanical degradation of 8/65/35 PLZT ceramics.
77.84.Dy Niobates, titanates, tantalates, PZT ceramics, etc.
77.22.Ej Polarization and depolarization
62.20.M- Structural failure of materials
77.22.Ch Permittivity (dielectric function)
Issue 20 (21 October 1998)
Received 27 May 1998, in final form 6 July 1998
A Levstik et al 1998 J. Phys. D: Appl. Phys. 31 2894
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