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Influence of composition on the unipolar electric fatigue of Ba(Zr 0.2 Ti 0.8 )O 3 ‐(Ba 0.7 Ca 0.3 )TiO 3 lead‐free piezoceramics
Author(s) -
Rojas Virginia,
Koruza Jurij,
Patterson Eric A.,
Acosta Matias,
Jiang Xijie,
Liu Na,
Dietz Christian,
Rödel Jürgen
Publication year - 2017
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.15013
Subject(s) - tetragonal crystal system , materials science , orthorhombic crystal system , monoclinic crystal system , piezoelectricity , polarization (electrochemistry) , ferroelectricity , crystallography , piezoresponse force microscopy , perovskite (structure) , analytical chemistry (journal) , condensed matter physics , mineralogy , composite material , crystal structure , dielectric , chemistry , physics , optoelectronics , chromatography
The lead‐free (1− x )Ba(Zr 0.2 Ti 0.8 )O 3 ‐ x (Ba 0.7 Ca 0.3 )TiO 3 system is considered as promising candidate for the replacement of lead‐based piezoceramics in actuation applications, during which electric fatigue is a major concern. This issue was addressed in this work, where the unipolar fatigue resistance of three (1− x )Ba(Zr 0.2 Ti 0.8 )O 3 ‐ x (Ba 0.7 Ca 0.3 )TiO 3 compositions with different crystallographic structures (rhombohedral, orthorhombic, and tetragonal) was evaluated. Strain asymmetry and development of an internal bias field were observed in all compositions. The decrease in the remanent polarization and the large signal piezoelectric coefficient after 10 7 unipolar cycles was found to lie between 6%‐12% and 2%‐13%, respectively. The most pronounced fatigue was observed for the orthorhombic composition, which has the largest extrinsic contribution to strain. On the other hand, the best fatigue resistance was observed for the tetragonal composition, which has a predominantly intrinsic strain response. The correlation of fatigue resistance with strain mechanism was corroborated with determination of the Rayleigh parameters and changes in the domain morphology after cycling as confirmed by piezoresponse force microscopy.