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An ideal amplitude window against electric fatigue in BaTiO3-based lead-free piezoelectric materials.

Authors :
Fan, Zhongming
Koruza, Jurij
Rödel, Jürgen
Tan, Xiaoli
Source :
Acta Materialia. Jun2018, Vol. 151, p253-259. 7p.
Publication Year :
2018

Abstract

Electric fatigue has been a vexing issue for Pb(Zr,Ti)O 3 ceramics, the material-of-choice for piezoelectric technologies, where higher field amplitudes always lead to a more severe property degradation. Thus, piezoelectric devices must be driven under low electric fields to ensure performance reliability, which results in a low efficiency. In the past decade, the intensive worldwide research on lead-free compositions has identified a few ceramics with piezoelectric properties comparable to those of lead-containing ones. However, their resistance to electric fatigue has not been well studied. In this work, we report an abnormal amplitude dependence of electric fatigue in lead-free piezoelectrics: A BaTiO 3 -based ceramic suffers fatigue degradation when the field amplitude is low, but exhibits an amplitude window at higher fields with essentially no fatigue. Furthermore, electric-field in-situ transmission electron microscopy (TEM) experiments up to 10 5 cycles are conducted to clearly reveal that the degradation at low fields is due to the unique single-domain state. We, therefore, have identified an ideal amplitude window with performance at full potential and, at the same time, extremely high reliability for a lead-free piezoelectric ceramic that is promising to replace Pb(Zr,Ti)O 3 . [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
13596454
Volume :
151
Database :
Academic Search Index
Journal :
Acta Materialia
Publication Type :
Academic Journal
Accession number :
129403723
Full Text :
https://doi.org/10.1016/j.actamat.2018.03.067