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Large piezoelectricity and high Curie temperature in novel bismuth ferrite-based ferroelectric ceramics |
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| Authors: | Zhuo Yu Jiangtao Zeng Liaoying Zheng Wenbing Liu Guorong Li Abdelhadi Kassiba |
| Affiliation: | 1. Key Laboratory of Inorganic Functional Materials and Devices, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, China;2. Institut des Molécules et Matériaux du Mans (IMMM)-CNRS-UMR, Le Mans Université, Le Mans, France |
| Abstract: | The requirement for ferroelectric ceramics with a high Curie temperature and a high piezoelectric coefficient remains an important research task for high-temperature sensors and actuators applications. (0.76-x)BiFeO3-0.24PbTiO3-xBa(Sn0.2Ti0.8)O3 (BF-PT-BST) piezoelectric ceramics were fabricated using the solid-state reaction method. XRD analysis indicated that the incorporation of large ionic radius Ba2+ at A-site and nonferroelectric-active Sn4+ at B-site generated a decrease in the tetragonality degree c/a. A wide multiphase coexistence region was formed with the content of BST ranging from 0.13 to 0.28. The enhanced piezoelectric coefficient (d33 ~ 200pC/N) was achieved while maintaining a high Curie temperature (TC ~ 500°C) and a high depolarization temperature (Td ~ 450°C) for the composition of 0.6BF-24PT-0.16BST. TEM patterns provided clear evidence for the presence of nanodomains (~2nm) would be the predominant source for the enhanced piezoelectricity for the composition x = 0.20. The designed BF-PT-BST ternary system provides great potential for high-temperature piezoelectric applications. |
| Keywords: | bismuth ferrite ferroelectric ceramics high-Tc piezoelectric applications nanodomains tetragonality c/a |