Abstract
This paper reports the enhanced piezoelectric properties of gadolinium-modified Ca1−xGdxBi2Nb2O9 (CBN-100xGd, where x = 0–0.07) high Curie temperature polycrystalline ferroelectric ceramics. The crystal structure, microstructural morphology, and electrical properties of Gd-modified CBN ceramics are investigated in detail. The results reveal that the Gd-modified CBN ceramics have a pure two-layer Aurivillius-type structure, and exhibit plate-like grains. The resultant Gd-modified CBN ceramics exhibit better piezoelectric and electromechanical properties by comparison with unmodified CBN. The composition of CBN-3Gd exhibits the optimized piezoelectric performance with a high piezoelectric constant d33 value of 13 pC/N and a high Curie temperature Tc of 947 °C. The dc electrical resistivity is significantly enhanced, and that of the CBN-3Gd is 2.45 × 107 Ω cm at 500 °C and 1.53 × 106 Ω cm at 600 °C, which is larger by two orders of magnitude compared with that of unmodified CBN ceramics at the same temperature. Such good electrical properties suggest that the Gd-modified CBN ceramics are promising materials for high-temperature piezoelectric sensor applications.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (Grant No. 51872166), the Key Research and Development Program of Shandong Province, China (Grant No. 2019GGX102064), and the Key Research and Development Program of Shandong Province, China (Grant No. 2019JZZY010313). CK thanks the financial support from “National Young Scientist” program.
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Chen, JN., Kang, C., Hou, RM. et al. Dielectric, ferroelectric, and piezoelectric properties of Gd-modified CaBi2Nb2O9 high Curie temperature ceramics. Journal of Materials Research 36, 1086–1096 (2021). https://doi.org/10.1557/s43578-020-00023-2
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DOI: https://doi.org/10.1557/s43578-020-00023-2