Structure and piezoelectric properties of new ternary K0.5Na0.5NbO3–LiSbO3–CaTiO3 lead-free piezoceramics
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New ternary (1−x)K0.5Na0.5NbO3–x(0.80LiSbO3–0.20CaTiO3) lead-free ceramics were fabricated by a conventional ceramic technique and their structure and piezoelectric properties were studied. The results of X-ray diffraction reveal that LiSbO3 and CaTiO3 diffuse into the K0.5Na0.5NbO3 lattices to form a new solid solution with a perovskite structure. After the addition of LiSbO3 and CaTiO3, the cubic-tetragonal and tetragonal-orthorhombic phase transitions shift to lower temperatures. Coexistence of the orthorhombic and tetragonal phases is hence formed in the ceramics with 0.03 < x < 0.07 at room temperature, leading to a significant enhancement of the piezoelectric properties. For the ceramics with x = 0.04–0.06, the piezoelectric properties become optimum: d 33 = 172–253 pC/N, k P = 49.9–55.5%, k t = 49.2–52.1% and T C = 348–373 °C. The ceramic with x = 0.04 also exhibits a good thermal stability of piezoelectric properties.
KeywordsTetragonal Phasis Piezoelectric Property Piezoelectric Ceramic Good Piezoelectric Property Conventional Ceramic Fabrication Technique
This work was supported by the Projects of Education Department of Sichuan Province (08ZA047), and Science and Technology Bureau of Sichuan Province (09ZQ026-059).