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Microstructure and electrical properties of Ti-modified (Na0.5K0.5)(Ti x Nb1−x )O3 lead-free piezoelectric ceramics

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Abstract

Ti-Modified (Na0.5K0.5)(Ti x Nb1−x )O3 (NKNT) piezoelectric ceramics were fabricated by double-layer buried powder process at 1020°C for 2 h. The microstructures, and piezoelectric and dielectric properties of the lead-free NKNT ceramics were investigated. X-ray diffraction results indicated that Ti4+ had diffused into the (Na0.5K0.5)NbO3 lattices to form a solid solution with a perovskite structure. The introducing of Ti into the (Na0.5K0.5)NbO3 solid solution effectively reduced the sintering temperature and densified the microstructure with a decreased grain size. The highest relative density reached more than 90%. The highest piezoelectric dielectric coefficient d 33 and planar mode electromechanical coupling coefficient k p were 110 pC/N and 19.5%, which were obtained in the NKNT ceramic with 1 mol% Ti. The piezoelectric properties of the NKNT ceramics were enhanced by aging in air for a period of time owing to the compensation of oxygen vacancies.

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Authors and Affiliations

  1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, China

    Qian Zhang, Boping Zhang, Pei Zhao, Haitao Li & Limin Zhang

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  1. Qian Zhang
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  2. Boping Zhang
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  3. Pei Zhao
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  4. Haitao Li
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  5. Limin Zhang
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Correspondence to Boping Zhang.

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Zhang, Q., Zhang, B., Zhao, P. et al. Microstructure and electrical properties of Ti-modified (Na0.5K0.5)(Ti x Nb1−x )O3 lead-free piezoelectric ceramics. Rare Metals 28, 142–146 (2009). https://doi.org/10.1007/s12598-009-0028-0

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  • DOI: https://doi.org/10.1007/s12598-009-0028-0

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