Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/9210
Title: Ferroelectric and piezoelectric properties of Bi0.5Na0.5TiO3-SrTiO3-Bi0.5Li0.5TiO3 lead-free ceramics
Authors: Lin, D
Kwok, KW 
Chan, HLW 
Keywords: Ceramics
Ferroelectrics
Piezoelectricity
Sintering
Issue Date: 2009
Source: Journal of alloys and compounds, 2009, v. 481, no. 1-2, p. 310-315 How to cite?
Journal: Journal of Alloys and Compounds 
Abstract: New lead-free ternary ceramics (1 - x - y)Bi0.5Na0.5TiO3-xSrTiO3-yBi0.5Li0.5TiO3 have been prepared by an ordinary sintering technique and their ferroelectric and piezoelectric properties have been studied. All the ceramics can be well-sintered at 1100 °C. The results of X-ray diffraction reveal that Li+ and Sr2+ diffuse into the Bi0.5Na0.5TiO3 lattices to form a new solid solution with a single-phase rhombohedral perovskite structure. After the substitutions of Li+ and Sr2+, the coercive field EC decreases, the remanent polarization Pr increases, and hence the piezoelectric coefficient d33 and planar electromechanical coupling factor kp increase. For the ceramics with x = 0.13-0.15 and y = 0.10- 0.15, the piezoelectric properties become optimum, giving d33 = 127-146 pC/N and kP = 0.24-0.30. Our results also suggest that the ceramics may contain both the polar and non-polar regions near the depolarization temperature Td, which cause the polarization hysteresis loop become deformed and the ceramics become depolarized.
URI: http://hdl.handle.net/10397/9210
ISSN: 0925-8388
DOI: 10.1016/j.jallcom.2009.02.120
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