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FIALKA, J. BENEŠ, P. MICHLOVSKÁ, L. KLUSÁČEK, S. PIKULA, S. DOHNAL, P. HAVRÁNEK, Z.
Original Title
Measurement of thermal depolarization effects in piezoelectric coefficients of soft PZT ceramics via the frequency and direct methods
Type
journal article in Web of Science
Language
English
Original Abstract
Depolarization at high temperatures around the Curie point constitutes an important yet difficultly measurable material property of piezoelectric (PZT) ceramics. The common vibrometric technique (d33 meters) is not suitable for the measurement of temperature dependences, and therefore we used the frequency method to perform the desired procedures. The indicator selected to show the depolarization state in the piezoelectric ceramics consisted in the piezoelectric charge coefficient, whose value can be effectively measured via the above-mentioned frequency technique. The accuracy of the method was verified via comparing a d33 meter constructed by the authors (as described in this paper) and also by means of differently sized cylinders of ceramics NCE51, which are designed for longitudinal length modes. Based on the obtained results, we established a measurement methodology to exactly determine the value of the Curie point that corresponded to the phase transition to a cubic crystallographic structure. The experiment also confirmed the applicability of progressively controlled depolarization of PZT ceramics by high temperature in the range of between 350 and 370 °C, and it defined the temperature limits at which there occur irreversible changes of the piezoelectric properties of PZT ceramics. In the measured NCE51 material, the limit for irreversible changes was equal to 95% of the Curie temperature (368 °C).
Keywords
PZT ceramics; Piezoelectric charge coefficient; Curie temperature; Frequency method; Vibrometric method
Authors
FIALKA, J.; BENEŠ, P.; MICHLOVSKÁ, L.; KLUSÁČEK, S.; PIKULA, S.; DOHNAL, P.; HAVRÁNEK, Z.
Released
1. 9. 2016
Publisher
Elsevier Ltd.
Location
Elsevier Limited, The Boulevard, Langford Lane, Kidlington, Oxford, OX5 1GB, United Kingdom
ISBN
0955-2219
Periodical
Journal of the European Ceramic Society
Year of study
36
Number
11
State
United Kingdom of Great Britain and Northern Ireland
Pages from
2727
Pages to
2738
Pages count
12
URL
http://www.sciencedirect.com/science/article/pii/S0955221916301625
Full text in the Digital Library
http://hdl.handle.net/11012/209273
BibTex
@article{BUT124661, author="Jiří {Fialka} and Petr {Beneš} and Lenka {Michlovská} and Stanislav {Klusáček} and Stanislav {Pikula} and Přemysl {Dohnal} and Zdeněk {Havránek}", title="Measurement of thermal depolarization effects in piezoelectric coefficients of soft PZT ceramics via the frequency and direct methods", journal="Journal of the European Ceramic Society", year="2016", volume="36", number="11", pages="2727--2738", doi="10.1016/j.jeurceramsoc.2016.03.036", issn="0955-2219", url="http://www.sciencedirect.com/science/article/pii/S0955221916301625" }