Determination of depolarization temperature of (Bi1/2Na1/2)TiO3-based lead-free piezoceramics
By E. Anton, W. Jo, Dragan Damjanovic, J. Rödel. 2011
296 citations recorded by the source corpus.
The depolarization temperature Td of piezoelectric materials is an important figure of merit for their application at elevated temperatures. Until now, there are several methods proposed in the literature to determine the depolarization temperature of piezoelectrics, which are based on different physical origins. Their validity and inter-correlation have not been clearly manifested. This paper applies the definition of depolarization temperature as the temperature of the steepest decrease of remanent polarization and evaluates currently used methods, both in terms of this definition and practical applicability. For the investigations, the lead-free piezoceramics (1–y)(Bi1/2Na1/2TiO3–xBi1/2K1/2TiO3)−yK0.5Na0.5NbO3 in a wide compositional range were chosen. Results were then compared to those for BaTiO3 and a commercial Pb(Zr,Ti)O3-based material as references. Thermally stimulated depolarization current and in situ temperature-dependent piezoelectric coefficient d33 are recommended to determine Td according to the proposed definition. Methods based on inflection point of the real part of permittivity or the peak in dielectric loss give consistently higher temperature values.
Subfields: Atomic and Molecular Physics, and Optics, Biomedical Engineering, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/933d4ae2469381b7ce7dfcc8d493aca2654b60ff
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Citations in the corpus
- (Bi0.51 Na0.47)TiO3 based lead free ceramics with high energy density and efficiency (2019, background): “The first dielectric anomaly observed at lower temperature is identified as the depolarization temperature (Td), corresponding to the phase transition from field-induced ferroelectric to relaxor, or from one polar phase to another nonpolar phase with different symmetry [33].”