Geoscience Reference
In-Depth Information
RB
2
O
3
/SiO
2
4:1
[SiO
4
]
[SiO
4
]
1:1
[Si
2
O
7
]
[Si
6
O
15
]
[SiO
4
]
[Si
12
O
36
]
1:4
[Si
6
O
14
]
50
C
NaOH
(wt%)
Figure 4.3 NC diagram for the system Na
2
O
a
RE
2
O
3
a
SiO
2
a
H
2
O under hydrothermal
conditions.
1000
900
800
700
600
500
400
300
200
100
0
LaPO
4
LaPO
4
LaP
8
O
9
LaP
3
O
9
·
KLaP
4
O
12
n
H
2
O
LaP
5
O
14
LaPO
4
·
n
H
2
O
KLaP
4
O
12
.
n
H
2
O
La
5
(P
3
O
10
)
3
·
n
H
2
O
La(OH)
3
KLaHP
3
O
10
K
5
P
3
O
10
0
2
4
pH of the medium
6
8
10
Figure 4.4 TC diagram for the system K
2
O
a
La
2
O
3
a
P
2
O
5
a
H
2
O
[11]
.
diagrams—even in the phase diagrams of crystallization, the components can be
represented, for example, in a ternary system as a triangle.
Figure 4.5
shows the
phase diagram of crystallization in the system LiO
2
a
H
2
O at 750
C and
Ta
2
O
5
a
1700 atm
[12]
.
