Title :
Electric fatigue initiated by surface contamination in high polarization ceramics
Author :
Jiang, Qiyue ; Cao, Wanli ; Cross, L.E.
Author_Institution :
Pennsylvania Univ., University Park, PA, USA
fDate :
30 Aug-2 Sep 1992
Abstract :
A study of the fatigue behavior of hot-pressed PLZT (La-doped lead zirconate titanate) with composition 7/68/32 under different surface conditions is reported. It is found that the fatigue occurring at a few thousand of cycles is mainly caused by the contaminated surface instead of by intrinsic structure deterioration. For the same gold electrodes, samples with a conventionally cleaned surface showed significant fatigue within 105 switching cycles while samples with surfaces cleaned by an improved procedure did not show fatigue even after 108 switching cycles. The mechanism of fatigue introduced by surface contamination is explained by interface degradation between ceramic and electrode
Keywords :
ceramics; dielectric hysteresis; dielectric polarisation; electromechanical effects; fatigue; ferroelectric materials; hot pressing; lanthanum compounds; lead compounds; scanning electron microscope examination of materials; surface structure; surface treatment; Au electrodes; PbLaZrO3TiO3; contaminated surface; conventionally cleaned surface; electric fatigue; high polarization ceramics; hot pressed PLZT; interface degradation; intergranular microcracking; surface conditions; surface contamination; switching cycles; Actuators; Capacitive sensors; Ceramics; Electrodes; Fatigue; Ferroelectric materials; Gold; Hysteresis; Polarization; Surface contamination;
Conference_Titel :
Applications of Ferroelectrics, 1992. ISAF '92., Proceedings of the Eighth IEEE International Symposium on
Conference_Location :
Greenville, SC
Print_ISBN :
0-7803-0465-9
DOI :
10.1109/ISAF.1992.300635
