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

FangZhou Yao | Zendy; Julia Glaum | Zendy; Ke Wang | Zendy; Wook Jo | Zendy; Jürgen Rödel | Zendy; JingFeng Li | Zendy

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

Author(s) -

FangZhou Yao,

Julia Glaum,

Ke Wang,

Wook Jo,

Jürgen Rödel,

JingFeng Li

Publication year - 2013

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.182

H-Index - 442

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.4829150

Subject(s) - materials science , hysteresis , strain (injury) , lead (geology) , composite material , dielectric , permittivity , anisotropy , softening , amplitude , condensed matter physics , optoelectronics , optics , medicine , physics , geomorphology , geology

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.open4

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