Lin, D., Kwok, K.W., Lam, K.H. and Chan, H.L.W. (2007) Structure and electrical properties of K0.5Na0.5NbO3-LiSbO3 lead-free piezoelectric ceramics. Journal of Applied Physics, 101(7), 074111. (doi: 10.1063/1.2715486)
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Abstract
Lead-free piezoelectric ceramics (1-x)K0.5Na0.5NbO3-xLiSbO3 have been fabricated by a conventional ceramic sintering technique. The results of x-ray diffraction suggest that Li+ and Sb5+ diffuse into the K0.5Na0.5NbO3 lattices to form a solid solution with a perovskite structure. The ceramics can be well sintered at 1070-1110°C . The introduction of LiSbO3 into the Na0.5K0.5NbO3 solid solution decreases slightly the paraelectric cubic-ferroelectric tetragonal phase transition temperature (Tc), but greatly shifts the ferroelectric tetragonal-ferroelectric orthorhombic phase transition (TO-F) to room temperature. Coexistence of the orthorhombic and tetragonal phases is formed at 0.05 < x < .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=212pC/N, planar and thickness electromechanical coupling factors kp=46% and kt=47%, respectively, remanent polarization Pr=15.0μC/cm2, coercive field Ec=1.74kV/mm, and Curie temperature Tc=358°C.
| Item Type: | Articles |
|---|---|
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Lam, Dr Koko |
| Authors: | Lin, D., Kwok, K.W., Lam, K.H., and Chan, H.L.W. |
| College/School: | College of Science and Engineering > School of Engineering > Systems Power and Energy |
| Journal Name: | Journal of Applied Physics |
| Publisher: | American Institute of Physics |
| ISSN: | 0021-8979 |
| ISSN (Online): | 1089-7550 |
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