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Domain wall-grain boundary interactions in polycrystalline Pb(Zr0.7Ti0.3)O3 piezoceramics

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arxiv 2002.10176 v1 pith:4JDPOTQ3 submitted 2020-02-24 cond-mat.mtrl-sci

Domain wall-grain boundary interactions in polycrystalline Pb(Zr0.7Ti0.3)O3 piezoceramics

J. Schulthei{\ss} , S. Checchia , H. Ur\v{s}i\v{c} , T. Fr\"omling , J. E. Daniels , B. Mali\v{c} , T. Rojac , J. Koruza This is my paper
classification cond-mat.mtrl-sci
keywords grainboundariesdielectricdomainelectromechanicalpropertieswereinteractions
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Interactions between grain boundaries and domain walls were extensively studied in ferroelectric films and bicrystals. This knowledge, however, has not been transferred to polycrystalline ceramics, in which the grain size represents a powerful tool to tailor the dielectric and electromechanical response. Here, we relate changes in dielectric and electromechanical properties of a bulk polycrystalline Pb(Zr0.7Ti0.3)O3 to domain wall interactions with grain boundaries. Samples with grain sizes in the range of 3.9 - 10.4 micrometers were prepared and their microstructure, crystal structure, and dielectric/electromechanical properties were investigated. A decreasing grain size was accompanied by a reduction in large-signal electromechanical properties and an increase in small-signal dielectric permittivity. High-energy diffraction analysis revealed increasing microstrains upon decreasing the grain size, while piezoresponse force microscopy indicated an increased local coercive voltage near grain boundaries. The changes in properties were thus related to strained material volume close to the grain boundaries exhibiting reduced domain wall dynamics.

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