Crystal structure and ferroelectric properties of rare-earth substituted Bi Fe O 3 thin films
The influence of ion modification using rare-earth cations on crystal structures, along with the insulating and ferroelectric properties of Bi Fe O 3 (BFO) thin films was investigated. Rare-earth-substituted BFO films with chemical compositions of ( Bi 1.00 − x R E x ) Fe 1.00 O 3 ( x = 0 - 0.15 , R...
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| Published in | Journal of applied physics Vol. 100; no. 1; pp. 014106 - 014106-9 |
|---|---|
| Main Authors | , , , |
| Format | Journal Article |
| Published |
American Institute of Physics
07.07.2006
|
| Online Access | Get full text |
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| Summary: | The influence of ion modification using rare-earth cations on crystal structures, along with the insulating and ferroelectric properties of
Bi
Fe
O
3
(BFO) thin films was investigated. Rare-earth-substituted BFO films with chemical compositions of
(
Bi
1.00
−
x
R
E
x
)
Fe
1.00
O
3
(
x
=
0
-
0.15
,
R
E
=
La
and Nd) were fabricated on
(
111
)
Pt
∕
Ti
O
2
∕
Si
O
2
∕
(
100
)
Si
substrates using a chemical solution deposition technique. A crystalline phase of rhombohedral BFO was obtained by heat treatment in a
N
2
atmosphere at
500
°
C
for
5
min
. The crystal anisotropy and the Curie temperature of BFO were degraded continuously with increasing contents of
La
3
+
or
Nd
3
+
cations. Ion modification using
La
3
+
and
Nd
3
+
cations up to
x
=
0.05
lowered the leakage current density of the BFO film at room temperature from approximately
10
−
3
down to
10
−
6
A
∕
cm
2
. A polarization
(
P
)
-electrical field
(
E
)
hysteresis loop measured at
10
K
revealed that the intrinsic remanent polarization of
La
3
+
- and
Nd
3
+
-substituted BFO films with
x
=
0.05
(44 and
51
μ
C
∕
cm
2
, respectively) was smaller than that of a nonsubstituted BFO film
(
79
μ
C
∕
cm
2
)
, which is ascribed to the degradation of crystal anisotropy and the Curie temperature of the BFO crystal. |
|---|---|
| ISSN: | 0021-8979 1089-7550 |
| DOI: | 10.1063/1.2210167 |