摘要
Lead-free piezoelectric ceramics (1- )NaNbO - BaTiO have been fabricated by a traditional ceramic sintering technique. The effects of BaTiO (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- )NaNbO - BaTiO ceramics is 0.90NaNbO -0.10BaTiO . The 0.90NaNbO -0.10BaTiO ceramics sintered at 1250°C have higher properties: piezoelectric constant of 120 pC/N, dielectric constant of 718, planar electromechanical coupling factor of 24%, planar frequency of 3 MHz·mm, and the mechanical quality factor of 138, respectively. The results show that the (1- )NaNbO - BaTiO ceramics is one of the promising lead-free materials for high-frequency applications.
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