Volume 100, Issue 8 p. 3673-3683
ORIGINAL ARTICLE

Multilayer lead-free piezoceramic composites: Influence of co-firing on microstructure and electromechanical behavior

Azatuhi Ayrikyan

Corresponding Author

Azatuhi Ayrikyan

Department of Materials Science, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany

Institute of Materials Science, Technische Universität Darmstadt, Darmstadt, Germany

Correspondence

Azatuhi Ayrikyan, Department of Materials Science, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany.

Email: [email protected]

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Florian Weyland

Florian Weyland

Institute of Materials Science, Technische Universität Darmstadt, Darmstadt, Germany

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Sebastian Steiner

Sebastian Steiner

Institute of Materials Science, Technische Universität Darmstadt, Darmstadt, Germany

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Michael Duerrschnabel

Michael Duerrschnabel

Institute of Materials Science, Technische Universität Darmstadt, Darmstadt, Germany

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Leopoldo Molina-Luna

Leopoldo Molina-Luna

Institute of Materials Science, Technische Universität Darmstadt, Darmstadt, Germany

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Jurij Koruza

Jurij Koruza

Institute of Materials Science, Technische Universität Darmstadt, Darmstadt, Germany

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Kyle G. Webber

Kyle G. Webber

Department of Materials Science, Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany

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First published: 21 April 2017
Citations: 8

Abstract

In this study lead-free 2-2 and 0-3 ceramic/ceramic composites comprised of the non-ergodic relaxor 0.93(Bi1/2Na1/2)TiO3–0.07BaTiO3 and ergodic relaxor 0.94Bi0.5(Na0.75K0.25)0.5TiO3–0.06BiAlO3 were investigated. The macroscopic electromechanical behavior was characterized as a function of continuent content, revealing an enhancement in the unipolar strain from the multilayer composite structure. Systematic evaluation of the effects of co-sintering on microstructural properties, such as grain size and porosity, revealed potential mechanisms by which the increase in unipolar strain was achieved. In addition, interdiffusion between the constituents was observed, providing evidence for the formation of a functionally graded ceramic by co-sintering. These data are contrasted with high-resolution energy dispersive X-ray microanalysis for measurement of chemical composition across the interface of 2-2 ceramics. These findings provide insight into how synthesis routes can be optimized for tailoring the enhancement of electromechanical properties of lead-free electroceramic composite systems.