Publication Date:
2011-04-28
Description:
The antiferroelectric ceramics are often subjected to mechanical loading in transducer and high-strain actuator applications. How the electromechanical behavior changes under different load conditions is therefore very crucial for design. The electromechanical behavior of La-modified antiferroelectric ceramic lead zirconate titanate stannate (PLZST) under uniaxial compressive prestress is observed at stress up to 100 MPa using a homebuilt experimental setup in conjunction with a modified Sawyer–Tower circuit. The PLZST ceramic researched in this paper is near the ferroelectric—antiferroelectric phase boundary, and it has a lower forward phase transition electric field and slimmer electric hysteresis loop than conventional antiferroelectric ceramics. The results reveal that the area of the double hysteresis ( P – E ) loops, the saturation polarization ( P sat ), the longitudinal strain ( S ), and the remanent polarization ( P r ) decrease with increasing compressive prestress, while the forward phase transition field increases as the compressive prestress increases. Meanwhile the applied prestress virtually does not affect the transition field hysteresis (Δ E ) and the coercive field ( E c ). These results are interpreted through the non-180° domain switching processes and the stress induced decrease in the switchable part of ferroelectric and antiferroelectric domains under electric field.
Print ISSN:
0002-7820
Electronic ISSN:
1551-2916
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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