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Hardening of electromechanical properties in piezoceramics using a composite approach

K.V., Lalitha ; Riemer, Lukas M. ; Koruza, Jurij ; Rödel, Jürgen :
Hardening of electromechanical properties in piezoceramics using a composite approach.
[Online-Edition: http://dx.doi.org/10.1063/1.4986911]
In: Applied Physics Letters, 111 (022905) pp. 1-5. ISSN 00036951
[Artikel], (2017)

Offizielle URL: http://dx.doi.org/10.1063/1.4986911

Kurzbeschreibung (Abstract)

Piezoelectric applications such as ultrasonic motors, transformers and therapeutic ultrasonics demand high power generation with low losses, which is facilitated by “hard” ferroelectrics.Hardening of piezoelectric properties, characterized by high mechanical quality factor (Qm), is usually achieved by doping with lower valence elements, thereby tailoring the domain wall dynamics. In the present study, we demonstrate a hardening mechanism by developing composites of 0.94(Na1/2Bi1/2)TiO3-0.06BaTiO3 (NBT-6BT) with ZnO inclusions, as an alternative to chemical modifications. A decrease in the saturation polarization and total strain, higher internal bias fields, lower hysteretic losses and a two-fold increase in Qm are observed in comparison to NBT-6BT. The composite with 0.1 mole ratio of ZnO exhibits the highest Qm of 320 with d33=125 pC/N and Kp=0.29. A one-to-one correspondence between the increase in Qm and the decrease in the domain wall mobility is established from the ac field dependence of permittivity, in the framework of the Rayleigh law. A further increase in ZnO content beyond a mole ratio of 0.1 reduces Qm, but retains it at a higher level, as compared to NBT-6BT. The results are explained based on the poling-induced strain incompatibility between the matrix and the hard ZnO phase. This composite approach is therefore considered a generic hardening concept and can be extended to other ferroelectric systems. Published by AIP Publishing.

Typ des Eintrags: Artikel
Erschienen: 2017
Autor(en): K.V., Lalitha ; Riemer, Lukas M. ; Koruza, Jurij ; Rödel, Jürgen
Titel: Hardening of electromechanical properties in piezoceramics using a composite approach
Sprache: Englisch
Kurzbeschreibung (Abstract):

Piezoelectric applications such as ultrasonic motors, transformers and therapeutic ultrasonics demand high power generation with low losses, which is facilitated by “hard” ferroelectrics.Hardening of piezoelectric properties, characterized by high mechanical quality factor (Qm), is usually achieved by doping with lower valence elements, thereby tailoring the domain wall dynamics. In the present study, we demonstrate a hardening mechanism by developing composites of 0.94(Na1/2Bi1/2)TiO3-0.06BaTiO3 (NBT-6BT) with ZnO inclusions, as an alternative to chemical modifications. A decrease in the saturation polarization and total strain, higher internal bias fields, lower hysteretic losses and a two-fold increase in Qm are observed in comparison to NBT-6BT. The composite with 0.1 mole ratio of ZnO exhibits the highest Qm of 320 with d33=125 pC/N and Kp=0.29. A one-to-one correspondence between the increase in Qm and the decrease in the domain wall mobility is established from the ac field dependence of permittivity, in the framework of the Rayleigh law. A further increase in ZnO content beyond a mole ratio of 0.1 reduces Qm, but retains it at a higher level, as compared to NBT-6BT. The results are explained based on the poling-induced strain incompatibility between the matrix and the hard ZnO phase. This composite approach is therefore considered a generic hardening concept and can be extended to other ferroelectric systems. Published by AIP Publishing.

Titel der Zeitschrift, Zeitung oder Schriftenreihe: Applied Physics Letters
Band: 111
(Heft-)Nummer: 022905
Verlag: AIP Publishing
Fachbereich(e)/-gebiet(e): 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft
11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Nichtmetallisch-Anorganische Werkstoffe
Hinterlegungsdatum: 14 Jul 2017 11:19
Offizielle URL: http://dx.doi.org/10.1063/1.4986911
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