Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/33905
Title: Structure and piezoelectric properties of new (Bi 0.5Na 0.5) 1-x-yBa x(Yb 0.5Na 0.5) yTiO 3 lead-free ceramics
Authors: Lin, D
Kwok, KW 
Issue Date: 2010
Publisher: Springer
Source: Journal of materials science : materials in electronics, 2010, v. 21, no. 11, p. 1119-1124 How to cite?
Journal: Journal of materials science : materials in electronics 
Abstract: New lead-free ceramics (Bi 0.5Na 0.5) 1-x-yBa x(Yb 0.5Na 0.5) yTiO 3 (x = 0.02-0.10 and y = 0-0.04) have been prepared by an ordinary sintering technique and their structure and piezoelectric properties have been studied. X-ray diffraction shows that Ba 2+ and Yb 3+ diffuse into the Bi 0.5Na 0.5TiO 3 lattices to form a solid solution with a pure perovskite structure and a morphotropic phase boundary (MPB) between rhombohedral and tetragonal phases is formed at 0.04 < x < 0.10. The partial substitutions of Ba 2+ and Yb 3+ for A-site ions of Bi 0.5Na 0.5TiO 3 decrease effectively the coercive field E c and improve significantly the remanent polarization P r. The ceramics with x = 0.06 and y = 0-0.02 situate within the MPB and possess the lower E c and larger P r, and thus exhibit optimum piezoelectric properties: d 33 = 155-171 pC/N and k p = 29.2-36.7%. The temperature dependences of the dielectric and ferroelectric properties suggest that the ceramics may contain both the polar and non-polar regions at temperatures near/above T d.
URI: http://hdl.handle.net/10397/33905
ISSN: 0957-4522
EISSN: 1573-482X
DOI: 10.1007/s10854-009-0029-7
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