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Fatigue-free unipolar strain behavior in CaZrO3 and MnO2 co-modified (K,Na)NbO3-based lead-free piezoceramics

Yao, Fang-Zhou and Glaum, Julia and Wang, Ke and Jo, Wook and Rödel, Jürgen and Li, Jing-Feng (2013):
Fatigue-free unipolar strain behavior in CaZrO3 and MnO2 co-modified (K,Na)NbO3-based lead-free piezoceramics.
In: Applied Physics Letters, pp. 192907(1-4), 103, (19), ISSN 00036951, [Online-Edition: http://dx.doi.org/10.1063/1.4829150],
[Article]

Abstract

The unipolar fatigue behavior of CaZrO3 and MnO2 co-modified (K,Na,Li)(Nb,Ta)O3 lead-free piezoceramics was investigated systematically. The well-known charge agglomeration model is shown to explain the overall changes observed during unipolar fatigue, such as the development of bias field as well as the anisotropy in bipolar strain hysteresis and field-dependent dielectric permittivity. In addition, it is found that the unipolar strain exhibits only small degradation within 3% at the field amplitude of 2 kV/mm up to 107 cycles. This exceptionally good fatigue resistance is identified due to the presence of additional process, assigned as a “softening” effect that competes against the usual fatigue effect.

Item Type: Article
Erschienen: 2013
Creators: Yao, Fang-Zhou and Glaum, Julia and Wang, Ke and Jo, Wook and Rödel, Jürgen and Li, Jing-Feng
Title: Fatigue-free unipolar strain behavior in CaZrO3 and MnO2 co-modified (K,Na)NbO3-based lead-free piezoceramics
Language: English
Abstract:

The unipolar fatigue behavior of CaZrO3 and MnO2 co-modified (K,Na,Li)(Nb,Ta)O3 lead-free piezoceramics was investigated systematically. The well-known charge agglomeration model is shown to explain the overall changes observed during unipolar fatigue, such as the development of bias field as well as the anisotropy in bipolar strain hysteresis and field-dependent dielectric permittivity. In addition, it is found that the unipolar strain exhibits only small degradation within 3% at the field amplitude of 2 kV/mm up to 107 cycles. This exceptionally good fatigue resistance is identified due to the presence of additional process, assigned as a “softening” effect that competes against the usual fatigue effect.

Journal or Publication Title: Applied Physics Letters
Volume: 103
Number: 19
Uncontrolled Keywords: Ceramics; Materials properties; Material fatigue; Polarization; Permittivity; Piezoelectric transducers; Piezoelectric devices; Electrical hysteresis; Piezoelectricity; Piezoelectric materials
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
Date Deposited: 06 Nov 2013 09:07
Official URL: http://dx.doi.org/10.1063/1.4829150
Identification Number: doi:10.1063/1.4829150
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