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Curie Temperature of BaTiO3
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The Curie point (T
C) of BaTiO3 was earlier reported to be 120° C and has been recently believed to be 130° C. Some experiments have been performed here to reconfirm the T
C. Firing conditions used for preparing BaTiO3 were examined first with the use of pure BaCO3 or Ba(NO3)2 and TiO2. The x-dependence of T
C in (BaO)1-
x
(TiO2)1+
x
solid solution was measured. Data were scattered and suffered from individual variations. According to probability considerations, T
C of BaTiO3 was evaluated from the intercept at x=0. On the other hand, composition dependence of T
C in some related solid solution systems, (Ba1-
y
Pb
y
)TiO3. (Ba1-
y
Sr
y
)TiO3 and (BaTiO3)1-
y
(KF)
y
, was examined and the T
C of BaTiO3 was estimated by extrapolation toward the limit y→0. In conclusion, the Curie point of BaTiO3 is determined as 123.0±0.6° C.
Title: Curie Temperature of BaTiO3
Description:
The Curie point (T
C) of BaTiO3 was earlier reported to be 120° C and has been recently believed to be 130° C.
Some experiments have been performed here to reconfirm the T
C.
Firing conditions used for preparing BaTiO3 were examined first with the use of pure BaCO3 or Ba(NO3)2 and TiO2.
The x-dependence of T
C in (BaO)1-
x
(TiO2)1+
x
solid solution was measured.
Data were scattered and suffered from individual variations.
According to probability considerations, T
C of BaTiO3 was evaluated from the intercept at x=0.
On the other hand, composition dependence of T
C in some related solid solution systems, (Ba1-
y
Pb
y
)TiO3.
(Ba1-
y
Sr
y
)TiO3 and (BaTiO3)1-
y
(KF)
y
, was examined and the T
C of BaTiO3 was estimated by extrapolation toward the limit y→0.
In conclusion, the Curie point of BaTiO3 is determined as 123.
0±0.
6° C.
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