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Microstructure and electrical properties of NaNbO3-BaTiO3 lead-free piezoelectric ceramics

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Abstract

Lead-free piezoelectric ceramics (1 − x) NaNbO3-xBaTiO3 have been fabricated by a traditional ceramic sintering technique. The effects of BaTiO3 (BT) synthesized by hydrothermal method on crystal structure, density, dielectric, piezoelectric, and electromechanical properties were investigated. Results show that the phase structure transforms from the orthorhombic phase to the tetragonal phase with the increase of the content of BT, and the two phases co-exist when 0.08<×⩽0.10. However, the optimum composition for (1 − x)NaNbO3-xBaTiO3 ceramics is 0.90NaNbO3-0.10BaTiO3. The 0.90NaNbO3-0.10BaTiO3 ceramics sintered at 1250°C have higher properties: piezoelectric constant d 33 of 120 pC/N, dielectric constant ετ of 718, planar electromechanical coupling factor k p of 24%, planar frequency N d of 3 MHz·mm, and the mechanical quality factor Q m of 138, respectively. The results show that the (1−x)NaNbO3-xBaTiO3 ceramics is one of the promising lead-free materials for high-frequency applications.

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Authors and Affiliations

  1. Aeronautic Key Laboratory for Smart Materials & Structures, Nanjing University of Aeronautics & Astronautics, Nanjing, 210016, China

    Shihui Xie, Kongjun Zhu, Jinhao Qiu & Hua Guo

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  1. Shihui Xie
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  2. Kongjun Zhu
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  3. Jinhao Qiu
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  4. Hua Guo
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Correspondence to Shihui Xie.

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Xie, S., Zhu, K., Qiu, J. et al. Microstructure and electrical properties of NaNbO3-BaTiO3 lead-free piezoelectric ceramics. Front. Mech. Eng. China 4, 345–349 (2009). https://doi.org/10.1007/s11465-009-0050-9

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  • DOI: https://doi.org/10.1007/s11465-009-0050-9

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