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Erschienen in:
03.02.2020
Investigation of the electrical properties of textured 0.5[Ba(Zr0.2Ti0.8)]O3–0.5[(Ba0.7Ca0.3)TiO3] piezoceramics
Erschienen in: Journal of Materials Science: Materials in Electronics | Ausgabe 5/2020
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Abstract
In this study, lead-free 0.5[Ba(Zr0.2Ti0.8)]O3–0.5[(Ba0.7Ca0.3)TiO3] (BZT–BCT) piezoelectric ceramics were prepared in the temperature range of 1360–1480 °C by dry-pressing and tape-casting. 5 mole% plate-like BaTiO3 templates were used for texturing BZT–BCT through templated grain growth process. Highly textured ceramics with up to 0.94° of grain orientation as determined by the Lotgering factor were obtained with optimum sintering conditions. Textured ceramics exhibited excellent electromechanical properties (d33* > 900 pm/V, x > 0.19%) and dielectric properties (εr > 3000, tanδ < 1.8%) at room temperature. The Curie–Weiss analysis indicated that while ceramics with randomly oriented grains showed a mixed character between normal and relaxor ferroelectric behavior, development of texture led to a decrease in the diffuseness of the phase transition.