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Jo, Wook
Sustainable Functional Ceramics Lab
Research Interests
  • Lead-free piezoceramics, ultra - low temperature sintering, ferroelectrics, relaxor ferroelectrics, 2D materials, magnetoelectric materials, multiferroics

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Determination of depolarization temperature of (Bi1/2Na1/2)TiO3-based lead-free piezoceramics

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Title
Determination of depolarization temperature of (Bi1/2Na1/2)TiO3-based lead-free piezoceramics
Author
Anton, E.-M.Jo, WookDamjanovic, D.Rdel, J.
Keywords
Compositional range; Depolarization temperature; Elevated temperature; Higher temperatures; In-situ; Inflection points; Lead free piezoceramics; Pb(Zr , Ti)O; Piezoelectric coefficient; Piezoelectrics; Real part; Temperature dependent; Thermally stimulated depolarization currents; TiO
Issue Date
2011-11
Publisher
AMER INST PHYSICS
Citation
JOURNAL OF APPLIED PHYSICS, v.110, no.9, pp. -
Abstract
The depolarization temperature T-d 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-xBi(1/2)K(1/2)TiO(3))-yK(0.5)Na(0.5)NbO(3) in a wide compositional range were chosen. Results were then compared to those for BaTiO3 and a commercial Pb(Zr,Ti)O-3-based material as references. Thermally stimulated depolarization current and in situ temperature-dependent piezoelectric coefficient d(33) are recommended to determine T-d 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.
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DOI
10.1063/1.3660253
ISSN
0021-8979
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