Geoscience Reference
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Ba
2
+
BaOH
+
H
2
O
H
2
O
OH
−
OH
−
Ba
2
+
BaOH
+
H
+
TiO
2
BaTiO
3
TiO
2
BaTiO
3
Ba
2
+
OH
−
BaOH
+
Ba
2
+
H
+
H
2
O
BaOH
+
OH
−
(a)
Diffusion and reaction
Homogeneous nucleation
BaTiO
3
BaOH
+
Ba
2
+
BaOH
+
BaTiO
3
BaTiO
3
TiO
2
H
2
O
4
−
x
Ti(OH)
x
OH
−
H
+
Ba
2
+
BaOH
+
BaTiO
3
4
−
x
4
−
x
Ti(OH)
x
TiO
2
Ti(OH)
x
OH
−
BaTiO
3
H
+
BaOH
+
Ba
2
+
Heterogeneous nucleation
4
−
x
Ti(OH)
x
Ba
2
+
BaTiO
3
BaOH
+
BaTiO
3
BaTiO
3
BaTiO
3
(b)
Figure 10.40 (a) In situ reaction mechanism
[169]
and (b) dissolution
precipitation reaction
mechanism
[169]
.
agglomeration due to the organic materials having a lower relative permittivity and
a simple mode of size distribution.
Like the hydrothermal process, the formation of PbTiO
3
proceeds in alcohol solu-
tion by a dissolution
reprecipitation mechanism,
in which the dissolution of
