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Effects of B-Site Donor Modification on the Crystal Structure and the Electrical Properties of Lead-Free 0.65BiFeO3-0.35BaTiO3 Ceramics
Ist Teil von
Journal of the Korean Physical Society, 2019, 75(10), , pp.811-816
Ort / Verlag
Seoul: The Korean Physical Society
Erscheinungsjahr
2019
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
In the present work, lead-free piezoelectric ceramics 0.65Bi
1.05
Fe
1−
x
Ti
x
O
3
-0.35BaTi
1−
y
Nb
y
O
3
, where
x
=
y
= 0, 0.01, 0.015, 0.02, and 0.025, abbreviated as BFT-BTNb, were successfully synthesized by a solid-state reaction method and an air quenching method. The effects of
B
-Site donor modifications (Nb
5+
and Ti
4+
) on the crystal structure, the morphology and the electrical properties of the 0.65BF-0.35BT ceramics were studied. X-ray diffraction patterns showed the formation of a pure perovskite structure, without any secondary phases. Scanning electron microscope (SEM) micrographs revealed that the average grain size of the BF-BT ceramics decreased with the addition of
B
-Site donors. Improvements in the ferroelectric properties (
P
-
E
loops) and the electric field-induced strain properties (
S
-
E
loops) were obtained at the optimum composition of the BFT-BTN ceramics. In addition, the dynamic piezoelectric coefficient (
d
33
*
) was enhanced from 265 pm/V for (BFT-BTNb-0) to 360 pm/V for (BFT-BTNb-1) with high working temperature,
T
m
= 320 °C.