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Article

Influence of Quenching and Subsequent Annealing on the Conductivity and Electromechanical Properties of Na1/2Bi1/2TiO3-BaTiO3

Department of Materials and Earth Sciences, Technical University of Darmstadt, 64283 Darmstadt, Germany
Academic Editor: Haim Abramovich
Materials 2021, 14(9), 2149; https://doi.org/10.3390/ma14092149
Received: 16 November 2020 / Revised: 8 April 2021 / Accepted: 18 April 2021 / Published: 23 April 2021
(This article belongs to the Special Issue Piezoelectric Ceramics: From Fundamentals to Applications)
Na1/2Bi1/2TiO3-based materials have gained considerable attention for their potential to exhibit giant strain, very-high ionic conductivity comparable to yttria stabilized zirconia or high mechanical quality factor for use in high power ultrasonics. In recent times, quenching Na1/2Bi1/2TiO3-based compositions have been demonstrated to enhance the thermal depolarization temperature, thus increasing the operational temperature limit of these materials in application. This work investigates the role of quenching-induced changes in the defect chemistry on the dielectric, ferroelectric and piezoelectric properties of quenched Na1/2Bi1/2TiO3-BaTiO3. The quenched samples indeed demonstrate an increase in the bulk conductivity. Nevertheless, while subsequent annealing of the quenched samples in air/oxygen atmosphere reverts back the depolarization behaviour to that of a furnace cooled specimen, the bulk conductivity remains majorly unaltered. This implies a weak correlation between the defect chemistry and enhanced thermal stability of the piezoelectric properties and hints towards other mechanisms at play. The minor role of oxygen vacancies is further reinforced by the negligible (10–15%) changes in the mechanical quality factor and hysteresis loss. View Full-Text
Keywords: lead-free piezoceramics; quenching; Na1/2Bi1/2TiO3; oxygen vacancies; thermal depolarization lead-free piezoceramics; quenching; Na1/2Bi1/2TiO3; oxygen vacancies; thermal depolarization
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MDPI and ACS Style

Kodumudi Venkataraman, L. Influence of Quenching and Subsequent Annealing on the Conductivity and Electromechanical Properties of Na1/2Bi1/2TiO3-BaTiO3. Materials 2021, 14, 2149. https://doi.org/10.3390/ma14092149

AMA Style

Kodumudi Venkataraman L. Influence of Quenching and Subsequent Annealing on the Conductivity and Electromechanical Properties of Na1/2Bi1/2TiO3-BaTiO3. Materials. 2021; 14(9):2149. https://doi.org/10.3390/ma14092149

Chicago/Turabian Style

Kodumudi Venkataraman, Lalitha. 2021. "Influence of Quenching and Subsequent Annealing on the Conductivity and Electromechanical Properties of Na1/2Bi1/2TiO3-BaTiO3" Materials 14, no. 9: 2149. https://doi.org/10.3390/ma14092149

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