Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.jallcom.2012.06.084
Title: Effects of Ca substitution on structure, piezoelectric properties, and relaxor behavior of lead-free Ba(Ti 0.9Zr 0.1)O 3 piezoelectric ceramics
Authors: Ye, S.
Fuh, J. 
Lu, L. 
Keywords: Ceramics
Microstructure
Piezoelectricity
SEM
Sintering
X-ray diffraction
Issue Date: 15-Nov-2012
Citation: Ye, S., Fuh, J., Lu, L. (2012-11-15). Effects of Ca substitution on structure, piezoelectric properties, and relaxor behavior of lead-free Ba(Ti 0.9Zr 0.1)O 3 piezoelectric ceramics. Journal of Alloys and Compounds 541 : 396-402. ScholarBank@NUS Repository. https://doi.org/10.1016/j.jallcom.2012.06.084
Abstract: Lead-free piezoelectric (Ba 1-xCa x)(Ti 0.9Zr 0.1)O 3 (BCTZ-x, x = 0, 0.05, 0.10, 0.15, 0.20) ceramics are synthesized via a conventional solid state reaction method. The effects of Ca substitution on the microstructure, dielectric properties, piezoelectric properties, and relaxor behavior of BCTZ ceramics were systematically investigated. Structural characterization of the synthesized BCTZ shows that a structure with morphortropic phase boundary (MPB) between rhombohedral phase and tetragonal phase at about x = 0.15 has been obtained. The (Ba 0.85Ca 0.15)(Ti 0.9Zr 0.1)O 3 ceramics exhibit the most homogeneous microstructure with the largest grains. The dielectric and piezoelectric properties are found to be enhanced near the phase transition composition due to the lattice distortion caused by Ca 2+ substitution. The dielectric relaxor behavior of the BCTZ ceramics was enhanced with increasing Ca content. The relaxor nature of the BCTZ ceramics may be attributed to the formation of polar clusters induced by local distortion. The increased relaxor behavior in the BCTZ ceramics also contributes to the improvement of the piezoelectric properties. The (Ba 0.85Ca 0.15)(Ti 0.9Zr 0.1)O 3 ceramic exhibits optimum properties with a dielectric constant, 3T/ 0, of 5800, piezoelectric constant, d 33, of 350 pC/N, d 31 of -122 pC/N, electromechanical coupling factor, k p, of 33%, and k 31, of 16%, indicating that the (Ba,Ca)(Ti,Zr)O 3 ceramic is a promising candidate for lead-free piezoelectric materials. © 2012 Published by Elsevier B.V.
Source Title: Journal of Alloys and Compounds
URI: http://scholarbank.nus.edu.sg/handle/10635/85073
ISSN: 09258388
DOI: 10.1016/j.jallcom.2012.06.084
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