Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/20433
Title: Piezoelectric and ferroelectric properties of (Bi0.94-xLa xNa0.94)0.5Ba0.06TiO3 lead-free ceramics
Authors: Zheng, Q
Xu, C
Lin, D
Gao, D
Kwok, KW 
Issue Date: 2008
Publisher: Institute of Physics Publishing
Source: Journal of physics. D, Applied physics, 2008, v. 41, no. 12, 125411 How to cite?
Journal: Journal of physics. D, Applied physics 
Abstract: Lead-free piezoelectric ceramics (Bi0.94-x LaxNa 0.94)0.5Ba0.06TiO3 have been fabricated by an ordinary sintering technique, and their piezoelectric and ferroelectric properties have been studied. The results of x-ray diffraction reveal that La3+ and Ba2+ diffuse into the Bi 0.5Na0.5TiO3 lattices to form a new solid solution with a pure perovskite structure. After the partial substitution of La3+ for Bi3+ in the (Bi0.94-x Lax Na0.94)0.5Ba0.06TiO3 ceramics (x = 0-0.04), the ceramics exhibit a lower coercive field Ec and a larger remanent polarization Pr. Because of the large Pr and low Ec, the ceramics with x = 0.02-0.04 exhibit optimum piezoelectric properties: d33 = 181-196 pC N-1 and kP = 33.2-36.3%. The depolarization temperature Td decreases with increasing x (x = 0 - 0.04). At the high La3+ level (x = 0.06-0.12), the ceramics exhibit weak ferroelectricity and thus possess very poor piezoelectricity, and the low dielectric anomaly at Td disappears. In addition, the ceramics exhibit a relaxor characteristic, which probably results from the cation disordering in the 12-fold coordination sites. The temperature dependences of the ferroelectric and dielectric properties suggest that the ceramics with x = 0-0.04 may contain both polar and non-polar regions at temperatures above Td, while for the ceramics with x = 0.06-12, the polar and non-polar regions coexist at room temperature.
URI: http://hdl.handle.net/10397/20433
ISSN: 0022-3727
EISSN: 1361-6463
DOI: 10.1088/0022-3727/41/12/125411
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