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http://hdl.handle.net/10397/4232
| Title: | Structure and electrical properties of K₀.₅Na₀.₅NbO₃-LiSbO₃lead-free piezoelectric ceramics | Authors: | Lin, D Kwok, KW Lam, KH Chan, HLW |
Issue Date: | 1-Apr-2007 | Source: | Journal of applied physics, 1 Apr. 2007, v. 101, no. 7, 074111, p. 1-6 | Abstract: | Lead-free piezoelectric ceramics (1−x)K₀.₅Na ₀.₅NbO₃-xLiSbO₃have been fabricated by a conventional ceramic sintering technique. The results of x-ray diffraction suggest that Liᐩ and Sb⁵ᐩ diffuse into the K₀.₅Na₀.₅NbO₃lattices to form a solid solution with a perovskite structure. The ceramics can be well sintered at 1070–1110 ℃ . The introduction of LiSbO₃into the Na₀.₅K₀.₅NbO₃solid solution decreases slightly the paraelectric cubic-ferroelectric tetragonal phase transition temperature (Tᴄ) , but greatly shifts the ferroelectric tetragonal-ferroelectric orthorhombic phase transition (T[sub O–F]) to room temperature. Coexistence of the orthorhombic and tetragonal phases is formed at 0.05< x <0.07 at room temperature, leading to a significant enhancement of the piezoelectric properties. For the ceramic with x=0.06, the piezoelectric properties become optimum: piezoelectric constant d₃₃=212 pC/N, planar and thickness electromechanical coupling factors kP =46% and kt=47%, respectively, remanent polarization Pᵣ=15.0 μC/cm², coercive field Ec=1.74 kV/mm, and Curie temperature Tᴄ=358 °C. | Keywords: | Potassium compounds Sodium compounds Lithium compounds Piezoceramics Sintering X-ray diffraction Ferroelectric transitions Piezoelectricity Dielectric polarisation Ferroelectric Curie temperature |
Publisher: | American Institute of Physics | Journal: | Journal of applied physics | ISSN: | 0021-8979 | EISSN: | 1089-7550 | DOI: | 10.1063/1.2715486 | Rights: | © 2007 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in D. Lin et al., J. Appl. Phys. 101, 074111 (2007) and may be found at http://link.aip.org/link/?jap/101/074111. |
| Appears in Collections: | Journal/Magazine Article |
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