Preparation and Electric Properties of Bi 0.5 Na 0.5 TiO 3 – Bi ( Mg 0.5 Ti 0.5 ) O 3 Lead‐Free Piezoceramics
Lead‐free BNT ‐based piezoceramics, (1− x ) Bi 0.5 Na 0.5 TiO 3 – x Bi ( Mg 0.5 Ti 0.5 ) O 3 [(1− x ) BNT – x BMT ] (0.00 ≤ x ≤ 0.06) binary system, were synthesized using a conventional ceramic fabrication method. Effect of Bi ( Mg 0.5 Ti 0.5 )O 3 ( BMT ) substitution on room temperature (RT) c...
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| Published in | Journal of the American Ceramic Society Vol. 96; no. 4; pp. 1171 - 1175 |
|---|---|
| Main Authors | , , , , , |
| Format | Journal Article |
| Language | English |
| Published |
01.04.2013
|
| Online Access | Get full text |
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| Summary: | Lead‐free
BNT
‐based piezoceramics, (1−
x
)
Bi
0.5
Na
0.5
TiO
3
–
x
Bi
(
Mg
0.5
Ti
0.5
)
O
3
[(1−
x
)
BNT
–
x
BMT
] (0.00 ≤
x
≤
0.06) binary system, were synthesized using a conventional ceramic fabrication method. Effect of
Bi
(
Mg
0.5
Ti
0.5
)O
3
(
BMT
) substitution on room temperature (RT) crystal structure, and temperature dependence of electric properties were investigated. The XRD indicates that a pure perovskite phase is formed. The introduction of
BMT
decreases
E
C
of
BNT
from 7.3 to 4.0 kV/mm, and increases
d
33
from 58 pC/N to 110 pC/N for the
x
=
0.05. The system shows a typical ferroelectric (
FE
) polarization loop
P
(
E
) and butterfly bipolar strain‐electric
S
(
E
) curve at RT. For the composition of 0.95
BNT
–0.05
BMT
antiferroelectric (
AFE
) phase appears near 80°C, characterized by a constricted
P
(
E
) loop and altered bipolar
S
(
E
) butterfly, and gradually prevails with increasing temperature. Temperature dependence of dielectric constant shows that
T
C
increases from 310°C for pure
BNT
to 352°C for the
x
=
0.05. The results indicate that the piezoelectric properties of
BNT
have been improved by means of
Bi
(
Mg
0.5
Ti
0.5
)
O
3
substitution. |
|---|---|
| ISSN: | 0002-7820 1551-2916 |
| DOI: | 10.1111/jace.12147 |