Enhanced Piezoelectric Properties of Tetragonal (Bi 1/2 K 1/2 )TiO 3 Lead‐Free Ceramics by Substitution of Pure Bi‐Based Bi(Mg 2/3 Nb 1/3 )O 3
Crystal structure, piezoelectric, and dielectric properties were investigated in the new lead‐free BKT‐based piezoelectric ceramics of (1− x )( Bi 1/2 K 1/2 ) TiO 3 ‐ x Bi ( Mg 2/3 Nb 1/3 ) O 3 . The morphotropic phase boundary (MPB) of the system between tetragonal and rhombohedral phases lies near...
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Published in | Journal of the American Ceramic Society Vol. 98; no. 1; pp. 104 - 108 |
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Main Authors | , , , , , , , |
Format | Journal Article |
Language | English |
Published |
United States
American Ceramic Society
01.01.2015
|
Online Access | Get full text |
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Summary: | Crystal structure, piezoelectric, and dielectric properties were investigated in the new lead‐free BKT‐based piezoelectric ceramics of (1−
x
)(
Bi
1/2
K
1/2
)
TiO
3
‐
x
Bi
(
Mg
2/3
Nb
1/3
)
O
3
. The morphotropic phase boundary (MPB) of the system between tetragonal and rhombohedral phases lies near the composition of
x
=
0.02. The optimal piezoelectric property of small‐signal
d
33
is much enhanced to be 96 pC/N (
x
=
0.01), which is higher than any other BKT‐based compositions. By the introduction of
Bi
(
Mg
2/3
Nb
1/3
)
O
3
, the ceramics exhibit a lower coercive field
E
C
. In addition, a relaxor‐like behavior with a frequency‐dependent Curie temperature
T
m
is observed, and high Curie temperature
T
m
around 380°C is obtained in the investigated system. This study suggests that the piezoelectric properties of BKT can be significantly improved by the means of
Bi
(
Mg
2/3
Nb
1/3
)
O
3
substitution. |
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Bibliography: | FOREIGN |
ISSN: | 0002-7820 1551-2916 |
DOI: | 10.1111/jace.13255 |