Enhanced Piezoelectric Properties of (Na sub(0.535)K sub(0.485)) sub(0.905)Li sub(0.095)(Nb sub(0. 94)Ta sub(0.06))O sub(3) -(Na sub(0.5)Bi sub(0.5))TiO sub(3) Lead-Free Piezoelectric Ceramics in the MPB Composition

In this paper, end members of tetragonal phase (Na sub(0.535)K sub(0.485)) sub(0.905)Li sub(0.095)(Nb sub(0. 94)Ta sub(0.06))O sub(3) (abbreviated as NKLN) and rhombohedral phase (Na sub(0.5)Bi sub(0.5))TiO sub(3) (abbreviated as NBT) were used to fabricate dense (1-x)NKLN-xNBT (x=0, 0.005, 0.01, 0....

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Bibliographic Details
Published in:Key engineering materials 2012-06, Vol.512-515, p.1390-1394
Main Authors: Shen, Zong Yang, Xiao, Zu Gui, Li, Yue Ming, Wang, Zhu Mei, Hong, Yan
Format: Article
Language:English
Subjects:
Ceramics
Constants
Dielectric constant
Electrical properties
Lead free
Phase boundaries
Piezoelectric ceramics
Piezoelectricity
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Summary:In this paper, end members of tetragonal phase (Na sub(0.535)K sub(0.485)) sub(0.905)Li sub(0.095)(Nb sub(0. 94)Ta sub(0.06))O sub(3) (abbreviated as NKLN) and rhombohedral phase (Na sub(0.5)Bi sub(0.5))TiO sub(3) (abbreviated as NBT) were used to fabricate dense (1-x)NKLN-xNBT (x=0, 0.005, 0.01, 0.02, 0.03, 0.04) lead-free piezoelectric ceramics. By increasing the NBT content x value, the crystalline structure changes from tetragonal phase to rhombohedral one across a morphotropic phase boundary (MPB) composition of x=0.02. In this MPB composition, enhanced electrical properties were obtained as follows: piezoelectric constant d sub(33)=202 pC/N, planar electromechanical coupling coefficient k sub(p)=39.6%, relative dielectric constant epsilon sub(r)=1020 and dielectric loss tg delta =2.67%, indicating that this ceramic was a promising lead-free piezoelectric material for practical applications.
ISSN:1013-9826
DOI:10.4028/www.scientific.net/KEM.512-515.1390