A nonlinear stress-strain behaviour at room temperature was observed in the ferroelectric Pb(Zr0.58Fe0.20Nb0.2Ti0.02)0.994U0.006 (PZFNTU) ceramic beams in the three-point bending test. This nonlinear phenomenon is attributed to the ferroelectric domain reorientation during bending. A stress relaxation behaviour which obeys perfectly a logarithmic time law has also been found. This relation is similar to the ageing of the dielectric constant. A Weibull analysis showed that the batch of the sintered PZT ceramic samples tested had a high Weibull modulus and a high flexural strength.
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Acoustics and Ultrasonics
- Surfaces, Coatings and Films