Structural, dielectric and piezoelectric study of Ca-, Zr-modified BaTiO3 lead-free ceramics
We prepared a lead-free ceramic ( Ba 0.85 Ca 0.15 ) ( Ti 1 - x Zr x ) O 3 (BCTZ) using the conventional mixed oxide technique. The samples were prepared by an ordinary mixing and sintering technique. In this study we investigated how small amounts of Zr 4 + can affect the crystal structure and micro...
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Veröffentlicht in: | Bulletin of materials science 2017-09, Vol.40 (5), p.925-931 |
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Hauptverfasser: | , , , , , , , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | We prepared a lead-free ceramic (
Ba
0.85
Ca
0.15
)
(
Ti
1
-
x
Zr
x
)
O
3
(BCTZ) using the conventional mixed oxide technique. The samples were prepared by an ordinary mixing and sintering technique. In this study we investigated how small amounts of
Zr
4
+
can affect the crystal structure and microstructure as well as dielectric and piezoelectric properties of
BaTiO
3
. X-ray diffraction analysis results indicate that no secondary phase is formed in any of the BCTZ powders for
0
≤
x
≤
0.1
, suggesting that
Zr
4
+
diffuses into
BaTiO
3
lattices to form a solid solution. Scanning electron microscopy micrographs revealed that the average grain size gradually increased with
Zr
4
+
content from 9.5
μ
m
for
x
=
0.02
to 13.5
μ
m
for
x
=
0.1
; Curie temperature decreased due to the small tetragonality caused by
Zr
4
+
addition. Owing to the polymorphic phase transition from orthorhombic to tetragonal phase around room temperature, it was found that the composition
x
=
0.09
showed improved electrical properties and reached preferred values of
d
33
=
148
pC
N
-
1
and
K
p
=
27
%
. |
---|---|
ISSN: | 0250-4707 0973-7669 |
DOI: | 10.1007/s12034-017-1445-6 |