TU Darmstadt / ULB / TUbiblio

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

Anton, Eva-Maria and Jo, Wook and Damjanovic, Dragan and Rödel, Jürgen (2011):
Determination of depolarization temperature of (Bi1/2Na1/2)TiO3-based lead-free piezoceramics.
110, In: Journal of Applied Physics, (9), pp. 094108(1-14), ISSN 00218979, [Online-Edition: http://dx.doi.org/10.1063/1.3660253],
[Article]

Abstract

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.

Item Type: Article
Erschienen: 2011
Creators: Anton, Eva-Maria and Jo, Wook and Damjanovic, Dragan and Rödel, Jürgen
Title: Determination of depolarization temperature of (Bi1/2Na1/2)TiO3-based lead-free piezoceramics
Language: English
Abstract:

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.

Journal or Publication Title: Journal of Applied Physics
Volume: 110
Number: 9
Uncontrolled Keywords: bismuth compounds, dielectric depolarisation, dielectric losses, dielectric polarisation, permittivity, piezoceramics, piezoelectricity, potassium compounds, sodium compounds, thermally stimulated currents
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 17 Nov 2011 09:17
Official URL: http://dx.doi.org/10.1063/1.3660253
Identification Number: doi:10.1063/1.3660253
Export:
Suche nach Titel in: TUfind oder in Google
Send an inquiry Send an inquiry

Options (only for editors)

View Item View Item