Enhancing electromechanical properties of lead-free ferroelectrics with bilayer ceramic/ceramic composites

Azatuhi Ayrikyan; Virginia Rojas; Leopoldo Molina-Luna; Matias Acosta; Jurij Koruza; Kyle G. Webber

doi:10.1109/TUFFC.2014.006673

Enhancing electromechanical properties of lead-free ferroelectrics with bilayer ceramic/ceramic composites

Azatuhi Ayrikyan, Virginia Rojas, Leopoldo Molina-Luna, Matias Acosta, Jurij Koruza, Kyle G. Webber

Institute of Materials Science, Joining and Forming (3030)

Research output: Contribution to journal › Article › peer-review

Abstract

The macroscopic electromechanical behavior of lead-free bilayer composites was characterized at room temperature. One layer consisted of a nonergodic relaxor, (Bi_1/2Na_1/2)TiO₃-7BaTiO₃, with an electric-field-induced longrange ferroelectric order, whereas the other is understood to be an ergodic relaxor [(Bi_1/2Na_1/2)TiO₃-25SrTiO₃] that undergoes a reversible electric-field-induced macroscopic nonpolar-to-polar transition. Microstructural evidence of a bilayer with low diffusion between the two components is also demonstrated. By taking advantage of the different macroscopic strain- and polarization-electric-field responses of the two constituents, internal mechanical and electrical fields can be developed that enhance the unipolar strain over that expected by a rule of mixtures approximation, thereby improving the properties needed for application of such materials to actuator systems. It is possible through further tailoring of the volume fractions and macroscopic properties of the constituents to optimize the electromechanical properties of multilayer lead-free ferroelectrics.

Original language	English
Article number	7119980
Pages (from-to)	997-1006
Number of pages	10
Journal	IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Volume	62
Issue number	6
DOIs	https://doi.org/10.1109/TUFFC.2014.006673
Publication status	Published - 1 Jun 2015

ASJC Scopus subject areas

Instrumentation
Acoustics and Ultrasonics
Electrical and Electronic Engineering

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10.1109/TUFFC.2014.006673

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title = "Enhancing electromechanical properties of lead-free ferroelectrics with bilayer ceramic/ceramic composites",

abstract = "The macroscopic electromechanical behavior of lead-free bilayer composites was characterized at room temperature. One layer consisted of a nonergodic relaxor, (Bi1/2Na1/2)TiO3-7BaTiO3, with an electric-field-induced longrange ferroelectric order, whereas the other is understood to be an ergodic relaxor [(Bi1/2Na1/2)TiO3-25SrTiO3] that undergoes a reversible electric-field-induced macroscopic nonpolar-to-polar transition. Microstructural evidence of a bilayer with low diffusion between the two components is also demonstrated. By taking advantage of the different macroscopic strain- and polarization-electric-field responses of the two constituents, internal mechanical and electrical fields can be developed that enhance the unipolar strain over that expected by a rule of mixtures approximation, thereby improving the properties needed for application of such materials to actuator systems. It is possible through further tailoring of the volume fractions and macroscopic properties of the constituents to optimize the electromechanical properties of multilayer lead-free ferroelectrics.",

author = "Azatuhi Ayrikyan and Virginia Rojas and Leopoldo Molina-Luna and Matias Acosta and Jurij Koruza and Webber, {Kyle G.}",

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AU - Ayrikyan, Azatuhi

AU - Rojas, Virginia

AU - Molina-Luna, Leopoldo

AU - Acosta, Matias

AU - Koruza, Jurij

AU - Webber, Kyle G.

PY - 2015/6/1

Y1 - 2015/6/1

N2 - The macroscopic electromechanical behavior of lead-free bilayer composites was characterized at room temperature. One layer consisted of a nonergodic relaxor, (Bi1/2Na1/2)TiO3-7BaTiO3, with an electric-field-induced longrange ferroelectric order, whereas the other is understood to be an ergodic relaxor [(Bi1/2Na1/2)TiO3-25SrTiO3] that undergoes a reversible electric-field-induced macroscopic nonpolar-to-polar transition. Microstructural evidence of a bilayer with low diffusion between the two components is also demonstrated. By taking advantage of the different macroscopic strain- and polarization-electric-field responses of the two constituents, internal mechanical and electrical fields can be developed that enhance the unipolar strain over that expected by a rule of mixtures approximation, thereby improving the properties needed for application of such materials to actuator systems. It is possible through further tailoring of the volume fractions and macroscopic properties of the constituents to optimize the electromechanical properties of multilayer lead-free ferroelectrics.

AB - The macroscopic electromechanical behavior of lead-free bilayer composites was characterized at room temperature. One layer consisted of a nonergodic relaxor, (Bi1/2Na1/2)TiO3-7BaTiO3, with an electric-field-induced longrange ferroelectric order, whereas the other is understood to be an ergodic relaxor [(Bi1/2Na1/2)TiO3-25SrTiO3] that undergoes a reversible electric-field-induced macroscopic nonpolar-to-polar transition. Microstructural evidence of a bilayer with low diffusion between the two components is also demonstrated. By taking advantage of the different macroscopic strain- and polarization-electric-field responses of the two constituents, internal mechanical and electrical fields can be developed that enhance the unipolar strain over that expected by a rule of mixtures approximation, thereby improving the properties needed for application of such materials to actuator systems. It is possible through further tailoring of the volume fractions and macroscopic properties of the constituents to optimize the electromechanical properties of multilayer lead-free ferroelectrics.

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ER -

Enhancing electromechanical properties of lead-free ferroelectrics with bilayer ceramic/ceramic composites

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